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Thread: Multple network cards = no internet?

  1. #1
    Join Date
    Jun 2011
    Location
    Sweden
    Beans
    2
    Distro
    Ubuntu 11.04 Natty Narwhal

    Unhappy Multple network cards = no internet?

    Hi.

    I have this setup in my /etc/network/interfaces

    Code:
    auto lo
    iface lo inet loopback
    
    eith eth1
    iface eth1 inet dhcp
    
    auto eth0
    iface eth0 inet static
    address 79.138.xxx.xxx
    netmask 255.255.255.0
    broadcast 79.138.xxx.xxx
    gateway 79.138.xxx.xxx
    dns-nameservers 79.138.xxx.xxx 85.8.xxx.xxx
    When I have both interfaces up, I cant ping any ip addresses.
    If i take down either eth0 OR eth1 it starts working.

    Resolv.conf contains nameservers for both interfaces.

    I have setup networking plenty of times before but this time I just seem to have f-ed something up totally. And I can't seem to find where the error is.

    Any suggestions as to where I should start searching?

  2. #2
    Join Date
    Jul 2010
    Location
    Suffolk, UK
    Beans
    31
    Distro
    Ubuntu

    Re: Multple network cards = no internet?

    Try and remove the gateway from eth0, I had a similar issue and that fixed it.

    For example..

    auto lo
    iface lo inet loopback

    auto eth0
    iface eth0 inet static
    address 192.168.0.100
    netmask 255.255.255.0
    gateway 192.168.0.1


    auto eth2
    iface eth2 inet static
    address 192.168.1.101
    netmask 255.255.255.0
    Is working for me.

  3. #3
    Join Date
    Nov 2008
    Location
    Metro Boston
    Beans
    9,973
    Distro
    Kubuntu 14.04 Trusty Tahr

    Re: Multple network cards = no internet?

    Does the DHCP server also give out a gateway address? You can only have one default gateway, as that is the router that handles traffic that doesn't match any local subnets. Since it appears eth0 is connected to the Internet, that's the one that needs the gateway.

    If you can't change the configuration of the DHCP server, you can edit /etc/dhcp3/dhclient.conf and remove the "routers" entry from the "request" directive.

  4. #4
    Join Date
    Jun 2011
    Location
    Sweden
    Beans
    2
    Distro
    Ubuntu 11.04 Natty Narwhal

    Re: Multple network cards = no internet?

    Yeah it worked when I removed the gateway from my internet connection. However. removing it from the local dhcp that is only meant as a management network to the server seems like a better approach.

    Thx for the solution to the problem.

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