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

[blue balls]

Here are the results of doing just that experiment:

root at pc1:/# ifup eth1
root at pc1:/# 
root at pc1:/# nslookup www.yahoo.com
;; connection timed out; no servers could be reached

root at pc1:/# ifdown eth1
root at pc1:/# 
root at pc1:/# nslookup www.yahoo.com
Server:         212.4.64.139
Address:        212.4.64.139#53

Non-authoritative answer:
www.yahoo.com   canonical name = fp.wg1.b.yahoo.com.
fp.wg1.b.yahoo.com      canonical name = eu-fp.wa1.b.yahoo.com.
Name:   eu-fp.wa1.b.yahoo.com
Address: 87.248.122.122
Name:   eu-fp.wa1.b.yahoo.com
Address: 87.248.112.181

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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:
  New

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