Adjusting packet size

pcahill · ‎06-26-2008

I am have trouble with packets getting fragmented because of their size 1522 bytes. We have the "IP TCP MSS-ADJUST" command on the interface which is fine for TCP packets, but what can I do about UDP packets??

Joseph W. Doherty · ‎06-26-2008

One possible solution is to insure your network supports PMTU as do the clients. Second possiple solution is to reduce MTU on clients.

pcahill · ‎06-26-2008

Whats odd is that the oversized packet is originating in the router.

a.alekseev · ‎06-26-2008

clear df-bit and let them to be fragmented.

you can do nothing with udp.

P.S. How could you manage to get 1522 bytes packets. I think that is with L2 headers...

pcahill · ‎06-26-2008

That is my assumption also. The MTU for the interface is 1500 and the "bytes on the wire is 1522" and they are being fragmented correctly. I was really try to figure out if I could do something with the UDP packets.

Thanks for your help, you basically answered my question.