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Thread: Second IP with OpenVPN

  1. #1
    Join Date
    Nov 2005
    Location
    Tumba, Sweden
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    139
    Distro
    Ubuntu 12.04 Precise Pangolin

    Second IP with OpenVPN

    Hello,

    I have a VPN service using OpenVPN.
    With this I previously had 1 fixed IP, but I recently upgraded for a larger bandwith, and with it I also got a second IP.
    But how do I add this IP as a separate interface?


    Also I want to make it so that all ordinary traffic goes through the Primary IP, but that I can assign some programs to use the secondary.
    For example Apache, or rtorrent.

    Any idea how to do this?

  2. #2
    Join Date
    Nov 2008
    Location
    Metro Boston
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    8,601
    Distro
    Kubuntu 14.04 Trusty Tahr

    Re: Second IP with OpenVPN

    Create two separate .conf files in /etc/openvpn, one for each connection. If you use the "dev tun" directive, you'll get two interfaces tun0 and tun1.

    You can bind processes to one or other virtual IPs. For instance, if tun0 has 10.0.0.1 and tun1 has 10.0.0.2, you can tell Apache to listen on the 10.0.0.2 address. See the "Listen" directive in Apache for details.

  3. #3
    Join Date
    Nov 2005
    Location
    Tumba, Sweden
    Beans
    139
    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: Second IP with OpenVPN

    Thanks for picking this up, i'm not so familiar with OpenVPN settings.

    So I make a copy of my existing openvpn.conf and rename it openvpn2.conf

    What do I need to change?
    I guess the ifconfig row needs to have my new IP.
    Do I need to change anything else?

    For safety I have removed all IP's.
    Code:
    dev tap
    remote 0.0.0.0
    float 0.0.0.0
    port 5081
    comp-lzo
    #ping 15
    verb 3
    mute 20
    ifconfig 0.0.0.0 255.255.255.128
    route-gateway 0.0.0.0
    redirect-gateway def1
    secret /etc/openvpn/key.txt
    cipher AES-128-CBC
    #dhcp-option DNS 0.0.0.0

  4. #4
    Join Date
    Nov 2008
    Location
    Metro Boston
    Beans
    8,601
    Distro
    Kubuntu 14.04 Trusty Tahr

    Re: Second IP with OpenVPN

    Each connection will need a separate port and a unique remote IP in the ifconfig directive. You can use the same IP on the server end with different remote IPs. For instance you can have on the server side

    port 12345
    ifconfig 10.1.1.1 10.1.1.100

    in one configuration and

    port 23456
    ifconfig 10.1.1.1 10.1.1.101

    in the other. I use the same shared key in each case. You can obviously specify a different key file for each connection, if you prefer, as long as it exists on both the server and the client.

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