[Bug 788301] Re: Networking fails with two interfaces on the same network

[Stéphane Graber]

Your setup can't possibly work (and indeed it doesn't). You can't have
two interfaces going to the same network without proper bonding,
especially when you also set both as your default gateway with the same
metric.

What I think you want in your case is some simple bonding of both
interfaces, then add both of your ips to the resulting bond0, this will
give you proper load-balancing between the two interfaces and high
availability.

Look at the ifenslave-2.6 package and it's associated manpage.

** Changed in: ifupdown (Ubuntu)
       Status: Triaged => Invalid

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https://bugs.launchpad.net/bugs/788301

Title:
  Networking fails with two interfaces on the same network

Status in “ifupdown” package in Ubuntu:
  Invalid

Bug description:
  Binary package hint: ifupdown

   Summary: when two network interfaces on the same computer are
  configured on the same network, the networking fails.

    Details: I have two network interfaces eth0 and eth1 which have static addresses: 192.168.1.2 and 192.168.1.3.
    The gateway is a home router which has the address 192.168.1.1.
    When both interfaces are brought up with "ifup", I cannot connect to the Internet. When only the first on is "up" and the other one is "down", the connection to the Internet works well.

  ProblemType: Bug
  DistroRelease: Ubuntu 10.04
  Package: ifupdown 0.6.8ubuntu29.2
  ProcVersionSignature: Ubuntu 2.6.32-31.61-generic 2.6.32.32+drm33.14
  Uname: Linux 2.6.32-31-generic i686
  NonfreeKernelModules: nvidia
  Architecture: i386
  Date: Wed May 25 21:41:45 2011
  ProcEnviron:
   LANGUAGE=
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: ifupdown

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