[Bridge] UDP Framgment

Stephen Hemminger shemminger at linux-foundation.org
Mon Apr 16 19:41:37 PDT 2007


On Mon, 16 Apr 2007 18:54:04 -0500
"Fernando Rodriguez" <frod at aitelecom.net> wrote:

> Hello,
> 
>  
> 
> I currently run a bridge with mastershaper but I im having somme issues
> regarding the udp packets that are fragmented is seems that they are unable
> to cross the bridge as they should they reach the other side of the network
> unusable, I have been trying to read regarding this issue on internet but
> couldn't find any answers.
> 

Bridges don't fragment themselves. They drop packets if MTU is different.
That is part of the standard.


> 
> Those udp packets are sent via multicast on the network
> 
>  
> 
> Im currently running Kernel  2.6.18.3 and bridge utils bridge-utils-1.0.4-4.

There maybe issues with checksum offload with some drivers in that kernel
Try turning it off in the ethernet driver (see ethtool)
driver.



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