View source for Setting up an IPsec tunnel between RUT and Android phone

<p style="color:red">The information in this page is updated in accordance with firmware version '''[https://wiki.teltonika-networks.com/view/FW_%26_SDK_Downloads 00.07.10]'''
==Introduction==

In this example, we're going to configure IPsec tunnel between RUT and Android phone. Since L2TP VPN configuration is not available on the newest Android phones, only IPsec tunnel has to be configured.

==Configuration overview and prerequisites==

Before we begin, let's take a look at the configuration that we are attempting to achieve and the prerequisites that make it possible.

'''Prerequisites''':
* RUT/RUTX series router with RUTOS firmware and Public IP (information about public and private IPs can be found [[Private and Public IP Addresses|here]]);
* An end device (PC, Laptop) for configuration;
* Android phone with Android 13 or newer version;

If you're having trouble finding any page or some of the parameters described here on your device's WebUI, you should turn on '''"Advanced WebUI"''' mode. You can do that by clicking the '''"Advanced"''' button which is located at the top-right corner of the WebUI.
[[File:Networking rutos manual webui basic advanced mode 75.gif|border|class=tlt-border|1004x1004px]]

==Topology==

[[File:IPsec android topology.png|800px|border|class=tlt-border]]

In this configuration example we have a Teltonika router on one end of the tunnel and an Android phone on the other end. Router has a Public Static IP address and is reachable from the internet, phone in this case has a Private IP provided by the ISP.

==Router configuration==

Start by configuring the router. Login to the WebUI, navigate to '''Services → VPN → IPsec''' and '''add a new IPsec instance'''. Configure everything as follows.

'''Note:''' ''Not specified fields can be left as is or changed according to your needs.''

===Instance configuration===
----
<table class="nd-othertables_2">
    <tr>
        <th width=330; style="border-bottom: 1px solid white;></th>
        <th width=800; style="border-bottom: 1px solid white"; rowspan=2>[[File:IpsecMainSettingsV1.png|border|class=tlt-border|755x406px|right]]</th>
    </tr>
    <tr>
        <td style="border-bottom: 4px solid white>
# '''''Enable''''' instance;
# Authentication method - '''''Pre-shared key;'''''
# Pre-shared key - '''''your desired password;'''''
# Local identifier - '''''LAN IP of RUT;'''''
        </td>
    </tr>
</table>

===Connection configuration===
----

<table class="nd-othertables_2">
    <tr>
        <th width=330; style="border-bottom: 1px solid white;></th>
        <th width=800; style="border-bottom: 1px solid white;" rowspan=2>[[File:Connection settings V1.png|border|class=tlt-border|753x368px|right]]</th>
    </tr>
    <tr>
        <td style="border-bottom: 4px solid white>
# Local subnet - '''''0.0.0.0/.0;'''''
# Key exchange - '''''IKEv2;'''''
        </td>
    </tr>
</table>

===Advanced Connection settings===
----
<table class="nd-othertables_2">
    <tr>
        <th width=330; style="border-bottom: 1px solid white;></th>
        <th width=800; style="border-bottom: 1px solid white;" rowspan=2>[[File:Advanced settings V1.png|border|class=tlt-border|752x541px|right]]</th>
    </tr>
    <tr>
        <td style="border-bottom: 4px solid white>
# Remote source IP - '''''10.0.2.0/24;''''' 
        </td>
    </tr>
</table>

===Proposal configuration===
----

<table class="nd-othertables_2">
    <tr>
        <th width=330; style="border-bottom: 1px solid white;></th>
        <th width=800; style="border-bottom: 1px solid white;" rowspan=2>[[File:Phase1 settingsV1.png|border|class=tlt-border|742x254px|right]]</th>
    </tr>
    <tr>
        <td style="border-bottom: 4px solid white>
* '''Phase 1'''
# Encryption - '''''AES256;'''''
# Authentication - '''''SHA256;'''''
# DH group - '''''MODP2048;'''''
        </td>
    </tr>
</table>

----
<table class="nd-othertables_2">
    <tr>
        <th width=330; style="border-bottom: 1px solid white;></th>
        <th width=800; style="border-bottom: 1px solid white;" rowspan=2>[[File:Phase2 connectionV2.png|border|class=tlt-border|748x257px|right]]</th>
    </tr>
    <tr>
        <td style="border-bottom: 4px solid white>
* '''Phase 2'''
# Encryption - '''''AES256;'''''
# Authentication - '''''SHA256;'''''
# DH group - '''''MODP1024;'''''
        </td>
    </tr>
</table>

==Android configuration==
Open Settings, navigate to '''Connections → More connection settings → VPN''' and '''Add VPN profile''' (VPN configuration could be placed in a different location, which could vary from phone to phone, if you're not able to find the settings, please refer to user manual).  Configure everything as follows.

===VPN Profile configuration===
----
<table class="nd-othertables_2">
    <tr>
        <th width=400; style="border-bottom: 1px solid white;></th>
        <th width=600; style="border-bottom: 1px solid white;" rowspan=2>[[File:Phonesettings Ipsec.png|border|class=tlt-border|742x399px|right]]</th>
    </tr>
    <tr>
        <td style="border-bottom: 4px solid white>
# Name - '''''Your preferred name for VPN profile;'''''
# Type - '''''IKEv2/IPSec PSK;'''''
# Server address - '''''RUT public IP;'''''
# IPSec identifier - '''''Your preferred identifier;'''''
# Pre-shared key - the '''''same password''''' you have '''''set on''''' '''''RUT''''' when configuring '''''IPsec instance;'''''
        </td>
    </tr>
</table>

==Testing the configuration==
If you've followed all the steps presented above, your configuration should be finished. But as with any other configuration, it is always wise to test the setup in order to make sure that it works properly. 

To test the connectivity, initiate connection from the Phone.

Using the <code><span class="highlight">'''ipsec status'''</span></code> command we can see that IPsec tunnel is successfully established between the devices. The command output on '''RUT''':

[[File:Classic Ipsec status command.png|border|class=tlt-border]]

Also, as the router's LAN should be reachable from the phone, we can try pinging the router using Ping tools application:

[[File:Ping from phone ping tools.png|border|class=tlt-border]]

== See also ==
[[RUTX12_VPN#IPsec|IPsec on Teltonika Networks devices]]

== External links ==
[https://openwrt.org/docs/guide-user/services/vpn/strongswan/basics OpenWrt IPsec basics]

[https://play.google.com/store/apps/details?id=ua.com.streamsoft.pingtools&hl=en&gl=US&pli=1 Ping Tools Application]
[[Category:VPN]]