[Bridge] large packet size doesn't work

Stephen Hemminger shemminger at osdl.org
Wed Apr 19 09:29:29 PDT 2006


On Wed, 19 Apr 2006 09:34:23 +0200
"Fulvio Ricciardi" <fulvio.ricciardi at zeroshell.net> wrote:

> Hi,
> I have just configured a Linux box with kernel 2.6.16.7 and configured two 
> ethernet interfaces (with MTU 1500) in bridge mode. CONFIG_BRIDGE_NETFILTER 
> is enabled.
> The problem is that ping -s 1500 192.168.0.2 doesn't work from 192.168.0.1 
> if the systems are separated by the bridge. Normal ping with smaller packet 
> size works ok.
> What is wrong? 
> 
> Best Regards
>  Fulvio Ricciardi
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Are you using VLAN's ? The bridge will not send packets to a device if
packet size > mtu of device.  VLAN's confuse it.



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