network bridge default MTU -- apparent change

[Joe Conway]

On 03/12/2010 01:59 PM, Tom Horsley wrote:
> On Fri, 12 Mar 2010 13:53:18 -0800
> Joe Conway wrote:
> 
>> But it now shows up on both my host machine and independently on a
>> fedora 12 virtual machine. Both are x86_64. Are you running x86_64?
> 
> Yep. 64 bit fedora 12. Just started another ubuntu virtual machine,
> br0 is still at 1500.

A bit more sleuthing and I found that the culprit is dhclient. I am
using a dynamically assigned address (pinned to a static IP at my dhcp
server), and I bet you are not. A downgrade makes the problem go away:

yum downgrade dhclient dhclient-4.1.0p1-12.fc12.x86_64
[...]
Running Transaction
  Installing     : 12:dhclient-4.1.0p1-12.fc12.x86_64
  Cleanup        : 12:dhclient-4.1.1-9.fc12.x86_64
[...]
# /etc/init.d/network restart
[...]
# ifconfig
br0       [...]
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

So I guess it is a change in behavior and probably a bug in dhclient.
I'll file a bug report...

Joe

-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 899 bytes
Desc: OpenPGP digital signature
Url : http://lists.fedoraproject.org/pipermail/users/attachments/20100317/a9a9561d/attachment.bin