From mboxrd@z Thu Jan  1 00:00:00 1970
From: Lucas Meneghel Rodrigues <lmr@redhat.com>
Subject: Re: [PATCH 07/18] KVM test: Add a subtest jumbo
Date: Wed, 29 Sep 2010 17:21:22 -0300
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On Wed, 2010-09-29 at 17:03 +0530, pradeep wrote:
> On Wed, 29 Sep 2010 08:07:19 -0300
> Lucas Meneghel Rodrigues <lmr@redhat.com> wrote:
> 
> 
> > 
> > Not as expected even after 10 seconds. The idea is to change the MTU,
> > wait a little while and check it again. Yes, I also got this problem
> > doing my test of the patch. Need to check why that is happening.
> > 
> 
> from guest i tried to remove arp entry from cache as mentioned in code.
> 
> arp -d 10.168.0.6 -i kvmbr0
> 
> It never worked for me. I guess this is the reason for this error.

I spend some time on this test today and got it working. The bottom line
is, we add a static arp cache entry for:

(IP of vm + MAC of vm interface) + corresponding tap interface
^ Guest side info                  ^ Host side info

If you issue a ifconfig on host while tests are running, you'll see the
tap interface:

virtio_0_5900 Link encap:Ethernet  HWaddr 8A:65:51:1F:6A:95  
          inet6 addr: fe80::8865:51ff:fe1f:6a95/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:65520  Metric:1
          RX packets:560511 errors:0 dropped:0 overruns:0 frame:0
          TX packets:565406 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:500 
          RX bytes:36697168035 (34.1 GiB)  TX bytes:36697563087 (34.1 GiB)

Then, if you run:

arp -s 10.16.74.148 9a:0b:5d:7a:e6:eb -i virtio_0_5900

It will work. Of course, the actual values of the ip and MAC addresses
have to be checked on guest side.

I have rebased this test and re-sent. You might try it, but now I think
it's going to work for you, as it did for me.

Moving closer to the completion of this patchset,

Lucas