Configure ASUS RT-AC86U to access Sonic VPN

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by schegg » Wed Jan 06, 2021 7:58 am
After some effort I was able to configure the VPN Client on an ASUS RT-AC86U router to connect as a client to Sonic's VPN. This ensures that all traffic (Wi-Fi and Ethernet) entering the router is encrypted through Sonic's VPN server.

The steps that worked for me were as follows:
  1. Installed the latest Merlin ASUS open-source software build: https://www.asuswrt-merlin.net/
  2. Downloaded the Sonic OpenVPN client (.ovpn) configuration file https://ovpn.sonic.net/?src=connect. Select, "Yourself (user-locked profile)" option.
  3. Made the following key changes to the config:
    1. Left only one "remote" line, commenting out the rest:

      Code: Select all

      remote ovpn.sonic.net 1194 udp
      #remote ovpn.sonic.net 1194 tdp
      #remote ovpn.sonic.net 443 tcp
      #remote ovpn.sonic.net 1194 udp
      #remote ovpn.sonic.net 1194 udp
      #remote ovpn.sonic.net 1194 udp
      #remote ovpn.sonic.net 1194 udp
      #remote ovpn.sonic.net 1194 udp
    2. Modified the following value to -1 ("default"), as the original value was not accepted by the asus client

      Code: Select all

      reneg-sec -1
    3. Asus client appeared to crash upon trying to configure an ipv6 interface through tunnel. Disabled that attempt:

      Code: Select all

      # Disable attempt to configure an ipv6 interface on asus
      pull-filter ignore "ifconfig-ipv6 "
      pull-filter ignore "route-ipv6 "

That's all. Seems to work quite well (so far).
by ngufra » Wed Jan 06, 2021 9:19 am
Are you connected to sonic directly or through resold AT&T ?
If connected directly to sonic, it does not seem terribly useful to use vpn.

You can also enable an open vpn server on merlin and install the openvpn client on a laptop to your router or to sonic.
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