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Thread: Dual nics, connecting both causes one connection to drop...

  1. #1
    Join Date
    Mar 2013
    Beans
    2

    Dual nics, connecting both causes one connection to drop...

    Hi all,

    Ubuntu server box with two nics. One lan facing, the other internet facing through a separate router. Both connections work individually, but when both are connected at the same time, the internal nic connection stops allowing connectivity to the server from the lan. I've disabled UFW in lieu of using Shorewall to control "zone" access, but even that fails. I do notice a default route gets set on reboot, but even removing that default route doesn't help.

    I did just add the following lines to the Sysctl.conf file to see if it helps any:
    net.ipv4.conf.all.arp_ignore=1
    net.ipv4.conf.all.arp_announce=2
    But this did not make any difference. Connectivity to the server from the internal nic is cut off whenever the external nic is connected.

    I absolutely can not have either network talking to each other, but do want the server to be able to access both in a secure manner <keeping traffic separate>.

    Any help would be appreciated!

    Carl
    Last edited by cmed67; March 28th, 2013 at 05:05 PM.

  2. #2
    Join Date
    Mar 2013
    Beans
    2

    Re: Dual nics, connecting both causes one connection to drop...

    Is there someplace else I need to post this question to hopefully get a response? I'm sure for someone this is a fairly simple issue and I could really use some help. :-/

  3. #3
    Join Date
    Jan 2006
    Location
    Not heaven... Iowa
    Beans
    Hidden!
    Distro
    Ubuntu

    Re: Dual nics, connecting both causes one connection to drop...

    Quote Originally Posted by cmed67 View Post
    Is there someplace else I need to post this question to hopefully get a response? I'm sure for someone this is a fairly simple issue and I could really use some help. :-/
    Nope! This should do.
    Do both interfaces get IP addresses? Are they in different subnets?
    Perhaps post results of:
    Code:
    ifconfig -a
    route -n
    Linux User #415691 Ubuntu User #8629
    Iowa Team (LoCo): [Wiki] [Launchpad]
    IRC channel: #ubuntu-us-ia on irc.freenode.net

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