[Asterisk-Users] UDP Fragmentation Problem

[Bastian Schern]

Rich Adamson schrieb:
> <snip>
> 
>>>>>>As far as I am aware there is no such thing as a fragmented UDP 
>>>>>>packet; each packet is sent out on its own, there is no coherency 
>>>>>>between UDP packets like there is with TCP packets.
>>>>>>
>>>>>>I could be very wrong here, it's been a late night with the kids.  :-)
>>>>>>
>>>>>
>>>>>Packet fragmentation is at the IP layer, so UDP will have fragmented 
>>>>>packets too. But... the OS should handle that and Asterisk shouldn't 
>>>>>find out - it's a all or none policy, so it should receive the whole 
>>>>>packet at once or nothing.
>>>>
>>>>How I can setup Linux to handle UDP fragments?
>>>
>>>
>>>Not sure why the concern with fragmentation, it should not be an issue 
>>>with any modern linux distribution and there is nothing to setup.
>>>
>>>The only issue that I've heard about in recent months/years relative
>>>to fragmentation is the SonicWall firewall just can't seem to get it
>>>right. In their case, any udp packet greater then about 1500 bytes does
>>>not get reassembled propery, and its still an issue in the latest firmware.
>>>
>>>If you really think you've got a fragmentation problem, I'd like to see
>>>a packet trace (eg, ethereal) of those packets.
>>>
>>
>>Here it is ;-)
> 
> 
> Okay, looked at the pcap and see the fragmentation, but that does not
> indicate your asterisk IP stack is not handling it properly. Might compare
> a 'sip debug' with those packets to see if data is reassembled.
> 
> Since both pieces of the original fragmented packet did in fact arrive at
> your destination, the only issue left is whether your IP stack reassembled
> them properly. I'd suspect another problem is lurking unrelated to
> fragmentation.
> 

I think you're right it seems to be the client side in Colombia. 
Tomorrow I will perform a trace there.

You've got a idea problem it could be?

Regards
	Bastian

> Rich
> 
> 
> _______________________________________________
> Asterisk-Users mailing list
> Asterisk-Users at lists.digium.com
> http://lists.digium.com/mailman/listinfo/asterisk-users
> To UNSUBSCRIBE or update options visit:
>    http://lists.digium.com/mailman/listinfo/asterisk-users