[Bridge] UDP Framgment

[Bridge] UDP Framgment

[Fernando Rodriguez]

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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.

 

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.

 

Thanks


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Re: [Bridge] UDP Framgment

[Stephen Hemminger]

On Mon, 16 Apr 2007 18:54:04 -0500
"Fernando Rodriguez" <frod@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.

Re: [Bridge] UDP Framgment

[Patrick McHardy]

Fernando Rodriguez wrote:
> 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.


Possibly related to connection tracking, it defragments packets.
Try "echo 0 > /proc/sys/net/bridge/bridge-nf-call-iptables".