[Asterisk-Users] UDP Fragmentation Problem

[Bastian Schern]

Adam Hart schrieb:
> Andrew Kohlsmith wrote:
> 
>> On October 31, 2004 05:36 pm, Bastian Schern wrote:
>>
>>> I've got no success to get a friend in Bogota (Colombia) connected to my
>>> Asterisk. He has got a ISDN Internet connection and the UDP packets will
>>> be fragmented. It seems that the MTU of this connection is round about
>>> 400 to 500 Bytes. Therefore most UDP-SIP packages are fragmented.
>>> Is Asterisk not able to handle fragmented UDP packages?
>>> Is it possible to use SIP over TCP with X-Lite?
>>> Or has somebody another hint for me?
>>
>>
>>
>> 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?