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VPN outgoing traffic; select eth

dnwkdnwk Member
in General

I have a server that use StrongSwan as VPN server. I have two IPs. How do I select which IP to use as out going traffic?
Thanks

Comments

  • CFarenceCFarence Member

    Was OS is it running? Easiest way is to have only one gateway. I have some servers that have a VPN connected and I don't want regular internet traffic going through the VPN. So for the VPN's interface I don't put a gateway.

  • TwinkerTwinker Member

    iptables and then you can choose the output interface or you can use SNAT with --to-source

  • dnwkdnwk Member

    It is Ubuntu 14. I have two IPs/eth. I want VPN user to connect to IP1. However, I want their outgoing traffic(visiting other website through VPN) using 2nd IP.

  • dnwkdnwk Member

    How to modify this Iptables to define the outgoing eth?
    iptables --table nat --append POSTROUTING --jump MASQUERADE

  • howardsl2howardsl2 Member
    edited December 2015

    @dnwk said:

    iptables -t nat -A POSTROUTING -s VPN_SUBNET_CIDR -o eth+ -j SNAT --to-source VPN_SERVER_2nd_IP

    Also in /etc/ipsec.conf, try adding this line: leftnexthop=Gateway_of_2nd_IP

    Thanked by 1dnwk
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