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Re: [Qemu-discuss] bridged ICMP with no replies for tap0 on linux host

From: Kate F
Subject: Re: [Qemu-discuss] bridged ICMP with no replies for tap0 on linux host
Date: Sat, 4 Oct 2014 16:39:53 +0100

On 4 October 2014 08:51,  <address@hidden> wrote:
> On Sat, Oct 04, 2014 at 12:05:18AM +0100, Kate F wrote:
>>   tap0      Link encap:Ethernet  HWaddr aa:26:97:82:c6:f1
>>             inet addr:  Bcast:  Mask:
> Are there any more routing table entries / interfaces on the host with
> addresses assigned from the same subnet? It sounds like the ping reply
> might be getting sent via an unexpected interface.
> David

Ah! I'd missed that. There was indeed a spurious routing entry to
another interface.

That was because I usually have tap0 bridged to other interfaces. I
thought I'd removed tap0 from the bridge (br0 on the host) so that I
could test this without anything interfering, but I accidently left
tap0 added to br0.

Just for reference in the future: My error was that some other
interface on that bridge had an IP. In Linux, as I understand,
interfaces added to a bridge should not themselves have IPs (which is
what creates unwanted routing entries). Although it is okay for br0
itself to have an IP.



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