Template:Networking rutos manual vpn

Summary

Virtual Private Network (VPN) is a method of connecting multiple private networks across the Internet. VPNs can serve to achieve many different goals, but some of its main purposes are:

• access between remote private networks;
• data encryption;
• anonymity when browsing the Internet.

This page is an overview of the different types of VPNs supported by {{{name}}} devices.

OpenVPN

OpenVPN is an open-source software application that implements virtual private network (VPN) techniques for creating secure point-to-point or site-to-site connections in routed or bridged configurations and remote access facilities. It is often regarded as being the most universal VPN protocol because of its flexibility, support of SSL/TLS security, multiple encryption methods, many networking features and compatibility with most OS platforms.

{{{name}}} devices run OpenVPN version 2.4.5.

OpenVPN client

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An OpenVPN client is an entity that initiates a connection to an OpenVPN server. To create a new client instance, go to the Services → VPN → OpenVPN section, select Role: Client, enter a custom name and click the 'Add' button. An OpenVPN client instance with the given name will appear in the "OpenVPN Configuration" list.

To begin configuration, click the button that looks liek a pencil next to the client instance. Refer to the figure and table below for information on the OpenVPN client's configuration fields:

Field	Value	Description
Enable	off | on; default: off	Turns the OpenVPN instance on or off.
Enable OpenVPN config from file	off | on; default: off	Enables or disables custom OpenVPN config from file.
TUN/TAP	TUN (tunnel) | TAP (bridged); default: TUN (tunnel)	Virtual network device type. TUN - a virtual point-to-point IP link which operates at the network layer (OSI layer 3), used when routing is required. TAP - a virtual Ethernet adapter (switch), operates at the data link layer (OSI layer 2), used when bridging is required.
Protocol	UDP | TCP; default: UDP	Transfer protocol used by the OpenVPN connection. Transmission Control Protocol (TCP) - most commonly used protocol in the Internet Protocol (IP) suite. It ensures the recipient will receive packets in the order they were sent by numbering, analysing response messages, checking for errors and resending them if an issue occurs. It should be used when reliability is crucial (for example, in file transfer). User Datagram Protocol (UDP) - packets are sent to the recipient without error-checking or back-and-forth quality control, meaning that when packets are lost, they are gone forever. This makes it less reliable but faster than TCP; therefore, it should be used when transfer speed is crucial (for example, in video streaming, live calls).
Port	integer [0..65535]; default: 1194	TCP/UDP port number used for the connection. Make sure it matches the port number specified on the server side. NOTE: traffic on the selected port will be automatically allowed in the device firewall rules.
LZO	Yes | No | None; default: None	Turns LZO data compression on or off.
Encryption	DES-CBC 64 | RC2-CBC 128 | DES-EDE-CBC 128 | DES-EDE3-CBC 192 | DESX-CBC 192 | BF-CBC 128 | RC2-40-CBC 40 | CAST5-CBC 128 | RC2-40CBC 40 | CAST5-CBC 128 | RC2-64-CBC 64| AES-128-CBC 128 | AES-192-CBC 192 | AES-256-CBC 256 | none; default: BF-CBC 128	Algorithm used for packet encryption.
Authentication	TLS | Static Key | Password | TLS/Password; default: TLS	Authentication mode, used to secure data sessions. Static key is a secret key used for server–client authentication. TLS authentication mode uses X.509 type certificates: Certificate Authority (CA) Client certificate Client key All mentioned certificates can be generated using OpenVPN or Open SSL utilities on any type of host machine. One of the most popular utilities used for this purpose is called Easy-RSA. Password is a simple username/password based authentication where the owner of the OpenVPN server provides the login data. TLS/Password uses both TLS and username/password authentication.
TLS: TLS cipher	All | DHE+RSA | Custom; default: All	Packet encryption algorithm cipher.
TLS: Allowed TLS ciphers	All | DHE+RSA | Custom; default: All	A list of TLS ciphers accepted by this connection.
Remote host/IP address	ip; default: none	IP address or hostname of an OpenVPN server.
Resolve retry	integer | infinite; default: infinite	In case server hostname resolve fails, this field indicates the amount of time (in seconds) to retry the resolve. Specify infinite to retry indefinitely.
Keep alive	two integers separated by a space; default: none	Defines two time intervals: the first is used to periodically send ICMP requests to the OpenVPN server, the second one defines a time window, which is used to restart the OpenVPN service if no ICMP response is received during the specified time slice. When this value is specfiied on the OpenVPN server, it overrides the 'keep alive' values set on client instances. Example: 10 120
Static key: Local tunnel endpoint IP	ip; default: none	IP address of the local OpenVPN network interface.
Static key: Remote tunnel endpoint IP	ip; default: none	IP address of the remote OpenVPN network (server) interface.
Remote network IP address	ip; default: none	LAN IP address of the remote network (server).
Remote network IP netmask	netmask; default: none	LAN IP subnet mask of the remote network (server).
Password: User name	string; default: none	Username used for authentication to the OpenVPN server.
Password: Password	string; default: none	Password used for authentication to the OpenVPN server.
Extra options	string; default: none	Extra OpenVPN options to be used by the OpenVPN instance.
TLS/Password: HMAC authentication algorithm	none | SHA1 | SHA256 | SHA384 | SHA512; default: SHA1	HMAC authentication algorithm type.
TLS/Password: Additional HMAC authentication	off | on; default: off	An additional layer of HMAC authentication on top of the TLS control channel to protect against DoS attacks.
TLS/Password: HMAC authentication key	.key file; default: none	Uploads an HMAC authentication key file.
TLS/Password: HMAC key direction	0 | 1 | none; default: 1	The value of the key direction parameter should be complementary on either side (client and server) of the connection. If one side uses 0, the other side should use 1, or both sides should omit the parameter altogether.
TLS/Password: Certificate authority	.ca file; default: none	Certificate authority is an entity that issues digital certificates. A digital certificate certifies the ownership of a public key by the named subject of the certificate.
TLS: Client certificate	.crt file; default: none	Client certificate is a type of digital certificate that is used by client systems to make authenticated requests to a remote server. Client certificates play a key role in many mutual authentication designs, providing strong assurances of a requester's identity.
TLS: Client key	.key file; default: none	Authenticates the client to the server and establishes precisely who they are.
TLS: Private key decryption password (optional)	string; default: none	A password used to decrypt the server's private key. Use only if server's .key file is encrypted with a password.
Static key: Static pre-shared key	.key file; default: none	Uploads a secret key file used for server–client authentication.

Additional notes:

• Some configuration fields become available only when certain other parameters are selected. The names of the parameters are followed by a prefix that specifies the authentication type under which they become visible. Different color codes are used for different prefixes:
  • Red for Authentication: TLS
  • Purple for Authentication: Static key
  • Blue for Authentication: Password
• After changing any of the parameters, don't forget to click the Save & Apply button located at the bottom-right side of the page.

OpenVPN server

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An OpenVPN server is an entity that waits for incoming connections from OpenVPN clients. To create a new server instance, go to the Services → VPN → OpenVPN section, select Role: Server, enter a custom name and click the 'Add' button. An OpenVPN server instance with the given name will appear in the "OpenVPN Configuration" list. Only one OpenVPN server instance is allowed to be added.

A server needs to have a public IP address in order to be available from the public network (the Internet).

To begin configuration, click the button that looks like a pencil next to the server instance. Refer to the figure and table below for information on the OpenVPN server's configuration fields:

Field	Value	Description
Enable	off | on; default: off	Turns the OpenVPN instance on or off.
Enable OpenVPN config from file	off | on; default: off	Enables or disables custom OpenVPN config from file.
TUN/TAP	TUN (tunnel) | TAP (bridged); default: TUN (tunnel)	Virtual network device type. TUN - a virtual point-to-point IP link which operates at the network layer (OSI layer 3), used when routing is required. TAP - a virtual Ethernet adapter (switch), operates at the data link layer (OSI layer 2), used when bridging is required.
Protocol	UDP | TCP; default: UDP	Transfer protocol used by the OpenVPN connection. Transmission Control Protocol (TCP) - most commonly used protocol in the Internet Protocol (IP) suite. It ensures the recipient will receive packets in the order they were sent by numbering, analysing response messages, checking for errors and resending them if an issue occurs. It should be used when reliability is crucial (for example, file transfer). User Datagram Protocol (UDP) - packets are sent to the recipient without error-checking or back-and-forth quality control, meaning that when packets are lost, they are gone forever. This makes it less reliable but faster than TCP; therefore, it should be used when transfer speed is crucial (for example, video streaming, live calls).
Port	integer [0..65535]; default: 1194	TCP/UDP port number used for the connection. Make sure it matches the port number specified on the server side. NOTE: traffic on the selected port will be automatically allowed in device firewall rules.
LZO	Yes | No | None; default: None	Turns LZO data compression on or off.
Encryption	DES-CBC 64 | RC2-CBC 128 | DES-EDE-CBC 128 | DES-EDE3-CBC 192 | DESX-CBC 192 | BF-CBC 128 | RC2-40-CBC 40 | CAST5-CBC 128 | RC2-40CBC 40 | CAST5-CBC 128 | RC2-64-CBC 64| AES-128-CBC 128 | AES-192-CBC 192 | AES-256-CBC 256 | none; default: BF-CBC 128	Algorithm used for packet encryption.
Authentication	TLS | Static Key | TLS/Password; default: TLS	Authentication mode, used to secure data sessions. Static key is a secret key used for server–client authentication. TLS authentication mode uses X.509 type certificates: Certificate Authority (CA) Client certificate Client key All mentioned certificates can be generated using OpenVPN or Open SSL utilities on any type of host machine. One of the most popular utilities used for this purpose is called Easy-RSA. TLS/Password uses both TLS and username/password authentication.
Static key: Local tunnel endpoint IP	ip; default: none	IP address of the local OpenVPN network interface.
Static key: Remote tunnel endpoint IP	ip; default: none	IP address of the remote OpenVPN network (client) interface.
Static key: Remote network IP address	ip; default: none	LAN IP address of the remote network (client).
Static key: Remote network IP netmask	netmask; default: none	LAN IP subnet mask of the remote network (client).
TLS/TLS/Password: TLS cipher	All | DHE+RSA | Custom; default: All	Packet encryption algorithm cipher.
TLS/Password: Allowed TLS ciphers	All | DHE+RSA | Custom; default: All	A list of TLS ciphers accepted by this connection.
TLS/TLS/Password: Client to client	off | on; default: off	Allows OpenVPN clients to communicate with each other on the VPN network.
TLS/TLS/Password: Keep alive	two integers separated by a space; default: none	Defines two time intervals: the first is used to periodically send ICMP requests to the OpenVPN server, the second one defines a time window, which is used to restart the OpenVPN service if no ICMP response is received during the specified time slice. When this value is specifiied on the OpenVPN server, it overrides the 'keep alive' values set on client instances. Example: 10 120
TLS/TLS/Password: Virtual network IP address	ip; default: none	IP address of the OpenVPN network.
TLS/TLS/Password: Virtual network netmask	netmask; default: none	Subnet mask of the OpenVPN network.
TLS/TLS/Password: Push option	OpenVPN options; default: none	Push options are a way to "push" routes and other additional OpenVPN options to connecting clients.
TLS/TLS/Password: Allow duplicate certificates	off | on; default: off	When enabled allows multiple clients to connect using the same certificates.
TLS/Password: User name	string; default: none	Username used for authentication to this OpenVPN server.
TLS/Password: Password	string; default: none	Password used for authentication to this OpenVPN server.
Static key: Static pre-shared key	.key file; default: none	Uploads a secret key file used for server–client authentication.
TLS/TLS/Password: Certificate authority	.ca file; default: none	Certificate authority is an entity that issues digital certificates. A digital certificate certifies the ownership of a public key by the named subject of the certificate.
TLS/TLS/Password: Server certificate	.crt file; default: none	A type of digital certificate that is used to identify the OpenVPN server.
TLS/TLS/Password: Server key	.key file; default: none	Authenticates clients to the server.
TLS/TLS/Password: Diffie Hellman parameters	.pem file; default: none	DH parameters define how OpenSSL performs the Diffie-Hellman (DH) key-exchange.
TLS/TLS/Password: CRL file (optional)	.pem file | .crl file; Default: none	A certificate revocation list (CRL) file is a list of certificates that have been revoked by the certificate authority (CA). It indicates which certificates are no longer acccepted by the CA and therefore cannot be authenticated to the server.

Additional notes:

• Some configuration fields become available only when certain other parameters are selected. The names of the parameters are followed by a prefix that specifies the authentication type under which they become visible. Different color codes are used for different prefixes:
  • Red for Authentication: TLS
  • Purple for Authentication: Static key
  • Blue for Authentication: TLS/Password
• After changing any of the parameters, don't forget to click the Save & Apply button located at the bottom-right side of the page.

TLS Clients

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TLS Clients is a way to differentiate clients by their Common Names (CN), which are found in the client certificate file. It can be used to assign specific VPN addresses to corresponding clients and bind them to their LAN addresses, making the server aware of which client has which LAN IP address.

The TLS Clients section can be found in the OpenVPN Server configuration window, provided that the OpenVPN server uses TLS or TLS/Password authentication methods. To create a new TLS client, type in the new client‘s name in the text field found bellow the TLS Clients tab and click the 'Add' button. Refer to the figure and table below for information on the TLS Clients' configuration fields:

Field	Value	Description
Endpoint name	string; default: none	A custom name for the client.
Common name (CN)	string; default: none	Client’s Common Name (CN) found in the client certificate file.
Virtual local endpoint	ip; default: none	Client’s local address in the virtual network.
Virtual remote endpoint	ip; default: none	Client’s remote address in the virtual network.
Private network	ip; default: none	Client’s private network (LAN) IP address.
Private netmask	netmask; default: none	Client’s private network (LAN) IP netmask.

GRE

Generic Routing Encapsulation (GRE) is a tunneling protocol used to establish point-to-point connections between remote private networks. GRE tunnels encapsulate data packets in order to route other protocols over IP networks.

GRE: main & tunnel settings

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To create a new GRE instance, go to the Services → VPN → GRE section, enter a custom name and click the 'Add' button. A GRE instance with the given name will appear in the "GRE Configuration" list.

To begin configuration, click the button that looks like a pencil located next to the instance. Refer to the figure and table below for information on the fields located in the GRE instance configuration section.

Field	Value	Description
Enabled	off | on; default: off	Turns the GRE instance on or off.
Tunnel source	network interface; default: none	Network interface used to establish the GRE Tunnel.
Remote endpoint IP address	ip; default: none	External IP address of another GRE instance used to establish the initial connection between peers.
MTU	integer; default: 1476	Sets the maximum transmission unit (MTU) size. It is the largest size of a protocol data unit (PDU) that can be transmitted in a single network layer transaction.
TTL	integer [0..255]; default: 255	Sets a custom TTL (Time to Live) value for encapsulated packets. TTL is a field in the IP packet header which is initially set by the sender and decreased by 1 on each hop. When it reaches 0 it is dropped and the last host to receive the packet sends an ICMP "Time Exceeded" message back to the source.
Outbound key	integer [0..65535]; default: none	A key used to identify outgoing packets. This value should match the "Inbound key" value set on the opposite GRE instance or both key values should be omitted on both sides.
Inbound key	integer [0..65535]; default: none	A key used to identify incoming packets. This value should match the "Outbound key" value set on the opposite GRE instance or both key values should be omitted on both sides.
Path MTU Discovery	off | on; default: on	When unchecked, sets the nopmtudisc option for tunnel. Can not be used together with the TTL option.
Keep alive	off | on; default: off	Turns "keep alive" on or off. The "keep alive" feature sends packets to the remote instance in order to determine the health of the connection. If no response is received, the device will attempt to re-establish the tunnel.
Keep alive interval	integer [0..255]; default: none	Frequency (in seconds) at which "keep alive" packets are sent to the remote instance.
Local GRE interface IP address	ip; default: none	IP address of the local GRE Tunnel network interface.
Local GRE interface netmask	netmask; default: none	Subnet mask of the local GRE Tunnel network interface.

GRE: routing settings

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Routing settings are used to configure routes to networks that are behind the device that hosts the opposite GRE instance. To add a new route, simply click the 'Add' button. For information on configuring the route refer to the figure and table below.

Field	Value	Description
Remote subnet IP address	ip; default: none	IP address of the network behind the device that hosts the remote GRE instance.
Remote subnet netmask	netmask; default: none	Subnet mask of the network behind the device that hosts the remote GRE instance.

IPsec

To create a new IPsec instance, go to the Services → VPN → IPsec section, enter a custom name and click the 'Add' button. An IPsec instance with the given name will appear in the "IPsec Configuration" list.

To begin configuration, click the button that looks like a pencil located next to the instance.

IPsec instance

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The general settings section is used to configure the main IPsec parameters. Refer to the figure and table below for information on the configuration fields located in the general settings section.

Field	Value	Description
Enable	off | on; default: off	Turns the IPsec instance on or off.
Remote endpoint	host | ip; default: none	IP address or hostname of the remote IPsec instance.
Authentication method	Pre-shared key | X.509; default: Pre-shared key	Specify authentication method. Choose between Pre-shared key and X.509 certificates.
Pre-shared key: Pre shared key	string; default: none	A shared password used for authentication between IPsec peers before a secure channel is established.
X.509: Key	.key file; default: none	A public key file.
X.509: Local Certificate	.pem file; default: none	A local certificate file.
X.509: CA Certificate	.crt file; default: none	A certificate authority file.
Local identifier	ip | string; default: none	Defines how the user (left participant) will be identified during authentication. IP - Internet Protocol address. FQDN - identity defined by fully qualified domain name. It is the complete domain name for a host (for example, something.somedomain.com). Only supported with IKEv2.
Remote identifier	ip | string; default: none	Defines how the right participant will be identified during authentication. IP - Internet Protocol address. FQDN - identity defined by fully qualified domain name. It is the complete domain name for a host (for example, something.somedomain.com). Only supported with IKEv2.

Additional notes:

• Some configuration fields become available only when certain other parameters are selected. The names of the parameters are followed by a prefix that specifies the authentication type under which they become visible. Different color codes are used for different prefixes:
  • Chocolate for Authentication method: Pre-shared key
  • Dark red for Authentication method: X.509

Advanced settings

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The Advanced settings section is only visible when X.509 is selected as Authentication method.

File:Networking rutx vpn ipsec ipsec configuration general advanced v1.png

Field	Value	Description
Remote Certificate	.crt file; default: none	A remote certificate file.

IPsec instance: connection settings

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The connection settings section is used to configure the main parameters of an IPsec connection. Refer to the figure and table below for information on the configuration fields located in the connection settings section.

General settings

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Field	Value	Description
Mode	Start | Add | Route; default: Start	Specifies which operation will be done automatically at IPSec startup.
Type	Tunnel | Transport; default: Tunnel	Type of connection. Tunnel - protects internal routing information by encapsulating the entire IP packet (IP header and payload); commonly used in site-to-site VPN connections; supports NAT traversal. Transport - only encapsulates IP payload data; used in client-to-site VPN connections; does not support NAT traversal; usually implemented with other tunneling protocols (for example, L2TP).
Tunnel: Local subnet	ip/netmask | default: none	Local IP address and subnet mask used to determine which part of the network can be accessed in the VPN network. Netmask range [0..32]. If left empty, IP address will be selected automatically.
Tunnel: Remote subnet	ip/netmask; default: none	Remote network IP address and subnet mask used to determine which part of the network can be accessed in the VPN network. Netmask range [0..32]. This value must differ from the device’s LAN IP.
Transport: Bind to	GRE interface; default: none	Bind to GRE interface to create GRE over IPsec.
Key exchange	IKEv1 | IKEv2; default: IKEv1	Internet Key Exchange (IKE) version used for key exchange. IKEv1 - more commonly used but contains known issues, for example, dealing with NAT. IKEv2 - updated version with increased and improved capabilities, such as integrated NAT support, supported multihosting, deprecated exchange modes (does not use main or aggressive mode; only 4 messages required to establish a connection).
Tunnel: Default route	off | on; default: off	Turn on to route all traffic through IPSec tunnel.

Additional notes:

• Some configuration fields become available only when certain other parameters are selected. The names of the parameters are followed by a prefix that specifies the authentication type under which they become visible. Different color codes are used for different prefixes:
  • Red for Type: Tunnel
  • Purple for Type: Transport

Advanced settings

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Field	Value	Description
Aggressive	off | on; default: off	Turn aggressive mode on or off for outgoing connections.
Force encapsulation	off | on; default: off	Forces UDP encapsulation for ESP packets even if a "no NAT" situation is detected.
Local firewall	off | on; default: on	Adds neccessary firewall rules to allow traffic of this IPsec instance on this device.
Remote firewall	off | on; default: on	Adds neccessary firewall rules to allow traffic of from the opposite IPsec instance on this device.
Inactivity	integer; default: none	Defines timeout interval, after which a CHILD_SA is closed if it did not send or receive any traffic.
Dead Peer Detection	off | on; default: off	A function used during Internet Key Exchange (IKE) to detect a "dead" peer. It used to reduce traffic by minimizing the number of messages when the opposite peer in unavailable and as failover mechanism.
Dead Peer Detection: DPD action	Restart | Hold | Clear | None; default: Restart	Controls the use of the Dead Peer Detection protocol where notification messages are periodically sent in order to check the liveliness of the IPsec peer.
Dead Peer Detection: DPD Delay	integer; default: none	The frequency of sending R_U_THERE messages or INFORMATIONAL exchanges to peer.
Tunnel: Remote source IP	ip; default: none	The internal source IP to use in a tunnel for the remote (right) peer.
Tunnel: Local source IP	ip; default: none	The internal (left) source IP to use in a tunnel, also known as virtual IP.
Tunnel: Remote DNS	ip; default: none	List of DNS server addresses to exchange as configuration attributes. On the responder, only fixed IPv4/IPv6 addresses are allowed and define DNS servers assigned to the client.
Locally allowed protocols	string; default: none	Allowed protocols and ports over connection, also called Port Selectors. Defines in form of 'protocol/port' eg:'17/1701' or '17/%any' or 'udp/l2f'.
Remotely allowed protocols	string; default: none	Allowed protocols and ports over connection, also called Port Selectors. Defines in form of 'protocol/port' eg:'17/1701' or '17/%any' or 'udp/l2f'.
Custom option	string; default: none	Add custom connection parameters.
Local source IP	ip; default: none	The internal (left) source IP to use in a tunnel, also known as virtual IP.
Tunnel: Passthrough	interface(s); default: none	Choose interface(s) for passthrough.

Additional notes:

• Some configuration fields become available only when certain other parameters are selected. The names of the parameters are followed by a prefix that specifies the authentication type under which they become visible. Different color codes are used for different prefixes:
  • Red for Type: Tunnel
  • Blue for Dead Peer Detection: Enabled

IPsec instance: proposal settings

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The proposal settings section is used to configure IKE (Internet Key Exchange) phase 1 & 2 settings. IKE is a protocol used to set up security associations (SAs) for the IPsec connection. This process is required before any IPsec tunnel can be established. It is done in two phases:

Phase	Mode
Phase 1 Establishes a secure channel between peers Authenticates peers Negotiates SA policy Shares secret keys Establishes secure tunnel for phase 2	Main mode (figure 1) 6 packets exchanged Identity protected during exchange	Aggressive mode (figure 2) 3 packets exchanged Identity information exchanged before a secure channel is established
Phase 2 Sets up matching IPsec SAs Periodically renegotiates IPsec SAs	Quick mode 3 packets exchanged IPsec SA parameters (ESP/AH, SHA/MD5) established SA lifetime set

Figure 1	Figure 2

Phase 1

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Field	Value	Description
Encryption algorithm	3DES | AES 128 | AES 192 | AES 256 | AES128 GCM8 | AES192 GCM8 | AES256 GCM8 | AES128 GCM12 | AES192 GCM12 | AES256 GCM12 | AES128 GCM16 | AES192 GCM16 | AES256 GCM16; default: AES 128	Algorithm used for data encryption.
Authentication	MD5 | SHA1 | SHA256 | SHA384 | SHA512; default: SHA1	Algorithm used for exchanging authentication and hash information.
DH group	MODP768 | MODP1024 | MODP1536 | MODP2048 | MODP3072 | MODP4096 | ECP192 | ECP224 | ECP256 | ECP384 | ECP521; default: MODP1536	Diffie-Hellman (DH) group used in the key exchange process. Higher group numbers provide more security, but take longer and use more resources to compute the key. Must match with another incoming connection to establish IPSec.
Force crypto proposal	off | on; default: off	Only chosen proposals will be used when turned on.
IKE Lifetime	string; default: none	How long the keying channel of a connection (ISAKMP or IKE SA) should last before being renegotiated. The time is specified in seconds. The s, m, h and d suffixes explicitly define the units for seconds, minutes, hours and days, respectively.

Phase 2

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Field	Value	Description
Hash algorithm	3DES | AES 128 | AES 192 | AES 256 | AES128 GCM8 | AES192 GCM8 | AES256 GCM8 | AES128 GCM12 | AES192 GCM12 | AES256 GCM12 | AES128 GCM16 | AES192 GCM16 | AES256 GCM16; default: AES 128	Algorithm used for data encryption.
Hash algorithm	MD5 | SHA1 | SHA256 | SHA384 | SHA512; default: SHA1	Algorithm used for exchanging authentication and hash information.
PFS group	MODP768 | MODP1024 | MODP1536 | MODP2048 | MODP3072 | MODP4096 | ECP192 | ECP224 | ECP256 | ECP384 | ECP521; default: MODP1536	The PFS (Perfect Forward Secrecy). Must match with another incoming connection to establish IPSec.
Force crypto proposal	off | on; default: off	Only chosen proposals will be used when turned on.
Lifetime	string; default: none	How long the keying channel of a connection (ISAKMP or IKE SA) should last before being renegotiated. The time is specified in seconds. The s, m, h and d suffixes explicitly define the units for seconds, minutes, hours and days, respectively.

PPTP

Point-to-Point Tunneling Protocol (PPTP) is a type of VPN protocol that uses a TCP control channel and a Generic Routing Encapsulation tunnel to encapsulate PPP packets.

PPTP client

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A PPTP client is an entity that initiates a connection to a PPTP server. To create a new client instance, go to the Services → VPN → PPTP section, select Role: Client, enter a custom name and click the 'Add' button. A PPTP client instance with the given name will appear in the "PPTP Configuration" list.

To begin configuration, click the button that looks like a pencil next to the client instance. Refer to the figure and table below for information on the PPTP client's configuration fields:

Field	Value	Description
Enable	off | on; default: off	Turns the PPTP instance on or off.
Server	ip | host; default: none	IP address or hostname of a PPTP server.
Username	string; default: none	Username used for authentication to the PPTP server.
Password	string; default: none	Password used for authentication to the PPTP server.
Default route	off | on; default: off	When turned on, this connection will become the device default route. This means that all traffic directed to the Internet will go through the PPTP server and the server's IP address will be seen as this device's source IP to other hosts on the Internet.

PPTP server

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A PPTP server is an entity that waits for incoming connections from PPTP clients. To create a new server instance, go to the Services → VPN → PPTP section, select Role: Server, enter a custom name and click the 'Add' button. A PPTP server instance with the given name will appear in the "PPTP Configuration" list. Only one PPTP server instance is allowed to be added.

A server needs to have a public IP address in order to be available from the public network (the Internet).

To begin configuration, click the button that looks like a pencil next to the server instance. Refer to the figure and table below for information on the PPTP server's configuration fields:

Field	Value	Description
Enable	off | on; default: off	Turns the PPTP instance on or off.
Local IP	ip; default: 192.168.0.1	IP address of this PPTP network interface.
Remote IP range start	ip; default: 192.168.0.20	PPTP IP address leases will begin from the address specified in this field.
Remote IP range end	ip; default: 192.168.0.30	PPTP IP address leases will end with the address specified in this field.
User name	string; default: none	Username used for authentication to this PPTP server.
Password	string; default: none	Password used for authentication to this PPTP server.
PPTP Client's IP	ip; default: none	Assigns an IP address to the client that uses the adjacent authentication info. This field is optional and if left empty the client will simply receive an IP address from the IP pool defined above.

L2TP

In computer networking, Layer 2 Tunneling Protocol (L2TP) is a tunneling protocol used to support virtual private networks (VPNs). It is more secure than PPTP but, because it encapsulates the transferred data twice, but it is slower and uses more CPU power.

L2TP client

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An L2TP client is an entity that initiates a connection to an L2TP server. To create a new client instance, go to the Services → VPN → L2TP section, select Role: Client, enter a custom name and click the 'Add' button. An L2TP client instance with the given name will appear in the "L2TP Configuration" list.

To begin configuration, click the button that looks like a pencil next to the client instance. Refer to the figure and table below for information on the L2TP client's configuration fields:

Field	Value	Description
Enable	off | on; default: off	Turns the L2TP instance on or off.
Server	ip | host; default: none	IP address or hostname of an L2TP server.
Username	string; default: none	Username used for authentication to the L2TP server.
Password	string; default: none	Password used for authentication to the L2TP server.
Default route	off | on; default: off	When turned on, this connection will become device default route. This means that all traffic directed to the Internet will go through the L2TP server and the server's IP address will be seen as this device's source IP to other hosts on the Internet.

L2TP server

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An L2TP server is an entity that waits for incoming connections from L2TP clients. To create a new server instance, go to the Services → VPN → L2TP section, select Role: Server, enter a custom name and click the 'Add' button. An L2TP server instance with the given name will appear in the "L2TP Configuration" list. Only one L2TP server instance is allowed to be added.

A server needs to have a public IP address in order to be available from the public network (the Internet).

To begin configuration, click the button that looks like a pencil next to the server instance. Refer to the figure and table below for information on the L2TP server's configuration fields:

Field	Value	Description
Enable	off | on; default: off	Turns the L2TP instance on or off.
Local IP	ip; default: 192.168.0.1	IP address of this L2TP network interface.
Remote IP range begin	ip; default: 192.168.0.20	L2TP IP address leases will begin from the address specified in this field.
Remote IP range end	ip; default: 192.168.0.30	L2TP IP address leases will end with the address specified in this field.
User name	string; default: user	Username used for authentication to this L2TP server.
Password	string; default: pass	Password used for authentication to this L2TP server.
L2TP Client's IP	ip; default: none	Assigns an IP address to the client that uses the adjacent authentication info. This field is optional and if left empty the client will simply receive an IP address from the IP pool defined above.

[[Category:{{{name}}} Services section]]