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| == Configuration Scheme == | | == Configuration Scheme == |
− | [[File:Topology LT2Pv3.png|border|class=tlt-border|750x750px]]
| + | I will paste a Topology Image here |
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| == DHCP Server Settings == | | == DHCP Server Settings == |
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| === DHCP Pool === | | === DHCP Pool === |
− | Login to the router's WebUI and navigate to '''Network → Interfaces → Ethernet LAN.''' Click the '''<nowiki/>'Edit'''' button on the right side of the interface to set the LAN network address.
| + | Enter the router's WebUI, go to '''Network > Interfaces > Ethernet LAN''' and click the '''<nowiki/>'Edit'''' button on the right side of the interface to modify the DHCP Pool. |
| + | [[File:Server a.png|center|thumb|627x627px|DHCP server pool]] |
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− | [[File:Server new 01 fixed.png|border|class=tlt-border|750x750px]]
| + | === Set up Main Mobile WAN === |
− | | + | Enter in the router’s WebUI, go to '''Network > Interfaces''' press mouse click on the Mobile Wan interface, then drag it to the 1<sup>st</sup> position and then press '''Save & Apply'''. |
− | Under '''DHCP SERVER''' set parameters for the DHCP pool.
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− | [[File:Server new 02 1 fixed.png|border|class=tlt-border|750x750px]]
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− | ===Set up Mobile WAN as Main WAN=== | |
− | Enter to the router’s WebUI, go to '''Network → Interfaces''' press mouse click on the Mobile Wan interface, then drag it to the 1<sup>st</sup> position and then press '''Save & Apply'''.
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− | [[File:Server new 03 fix.png|border|class=tlt-border|750x750px]]
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− | ===Create L2TPv3 instance===
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− | Go to router’s WebUI, under '''Service → VPN → L2TP → L2TPv3''' and create new '''L2TPV3''' instance.
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− | '''LOCAL SETTING'''
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− | Local address: 84.15.XXX.XXX
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− | Tunnel ID: 100
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− | Session ID: 100
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− | Cookie: 12ABCDEF
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− | '''PEER SETTING'''
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− | Peer address: 84.15.XXX.XXX
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− | Peer Tunnel ID: 10
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− | Peer Session ID: 10
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− | Peer Cookie: 12ABCDEF
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− | '''INSTANCE SETTING'''
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− | Bridge to: LAN
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− | MTU: 1500
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− | Encapsulation: IP
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− | Layer 2 specific header type: Linux Default
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− | | |
− | [[File:Server new 04 01 fix.png|border|class=tlt-border|750x750px]]
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− | [[File:Server new 04 02.png|border|class=tlt-border|750x750px]]
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− | '''Note:''' Specify on "Local address" your mobile WAN public IP. Local value for Tunnel ID, session ID and Cookie must match with the peer values being used at the other end.
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− | | |
− | ==DHCP Client Settings (Relay) ==
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− | ===DHCP Relay===
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− | Enter the router's WebUI, go to '''Network → Interface → LAN → DHCP Server''' and change the "'''Enable DHCP'''" field value from Enable to Relay and type in the DHCP Server the IP address of the server. Click '''Save & Apply'''. | |
− | | |
− | [[File:Client 01 fix.png|border|class=tlt-border|750x750px]]
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− | '''Note:''' The IPv4 address of the LAN interface is different from the server's LAN interface address, this is necessary to avoid conflicts.
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− | | |
− | ===Set up Mobile WAN as Main WAN===
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− | Enter to the router’s WebUI, go to '''Network → Interfaces''' press mouse click on the Mobile Wan interface, then drag it to the 1<sup>st</sup> position and then press '''Save & Apply'''.
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− | | |
− | [[File:Client 02 fix.png|border|class=tlt-border|750x750px]]
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− | | |
− | ===Modify Enable-DHCP-renew firewall rule===
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− | Enter in the router’s WebUI, go to '''Network → Firewall → Traffic rules''' to additionally allow destination port 67.
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− | [[File:Client 03.png|border|class=tlt-border|750x750px]]
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− | ===Create L2TPv3 instance===
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− | Go to router’s WebUI, under '''Service → VPN → L2TP → L2TPv3''' and create new '''L2TPV3''' instance.
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− | '''LOCAL SETTING'''
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− | | |
− | Local address: 84.15.XXX.XXX
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− | | |
− | Tunnel ID: 10
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− | | |
− | Session ID: 10
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− | | |
− | Cookie: 12ABCDEF
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− | | |
− | '''PEER SETTING'''
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− | | |
− | Peer address: 84.15.XXX.XXX
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− | | |
− | Peer Tunnel ID: 100
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− | | |
− | Peer Session ID: 100
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− | | |
− | Peer Cookie: 12ABCDEF
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− | | |
− | '''INSTANCE SETTING'''
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− | | |
− | Bridge to: LAN
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− | | |
− | MTU: 1500
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− | | |
− | Encapsulation: IP
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− | | |
− | Layer 2 specific header type: Linux Default
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− | | |
− | [[File:Client 04 fix.png|border|class=tlt-border|750x750px]]
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− | | |
− | [[File:Server new 04 02.png|border|class=tlt-border|750x750px]]
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− | | |
− | '''Note:''' Specify on "Local address" your mobile WAN public IP. Local value for Tunnel ID, session ID and Cookie must match with the peer values being used at the other end.
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− | ==Testing DHCP over L2TPv3==
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− | To test the realy settings go to DHCP server to check that devices are able to recieve IP addresses in the range 192.168.10.150 - 192.168.10.170 either via LAN port or Wi-Fi. Access the CLI and run '''cat /tmp/dhcp.leases''' to list all DHCP clients.
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− | [[File:Test 01 fix.png|border|class=tlt-border|750x750px]]
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− | Asking for the Address Resolution Protocol (ARP) table is also an other method to find hosts on the LAN network.
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− | [[File:Test 02 fix.png|border|class=tlt-border|750x750px]]
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− | [[Category:Use cases]]
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Introduction
A DHCP relay agent allows the DHCP clients to obtain IP addresses from a DHCP server that is not configured on the same LAN.
This article provides a configuration example with details on how to set-up a DHCP relay over a L2TPv3 VPN.
Prerequisites
You will need:
- Two RUT or RUTX devices (one as Server and other as Client)
- A PC acting as a Host for testing
- Both routers must have a Public Static or Public Dynamic IP addresses
Configuration Scheme
I will paste a Topology Image here
DHCP Server Settings
DHCP Pool
Enter the router's WebUI, go to Network > Interfaces > Ethernet LAN and click the 'Edit' button on the right side of the interface to modify the DHCP Pool.
Set up Main Mobile WAN
Enter in the router’s WebUI, go to Network > Interfaces press mouse click on the Mobile Wan interface, then drag it to the 1st position and then press Save & Apply.