TCP transport again

Stefan Winter stefan.winter at
Fri Sep 25 09:55:13 CEST 2009


> regarding this - a new feature of 2.1.7 related to the DF bit for the UDP 
> packets. I believe that the change meant that the do not fragment bit was 
> changed to be set - 

No, it *unsets* the bit. Linux sets it by default, and in effect, can 
cause large packets to be discarded if MTU decreases on the link 
somewhere. Unsetting it gives at least a good chance that routers *can* 
fragment the large packet if need be. Unless your routers are broken of 

> was any regard to this being default, rather than configurable,
> given - I suspect several people might fall foul of this issue when they try
> throwing 1500 byte EAP packets across their WAN.......

It is meant to help these people :-)


> alan
> -
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