ICMP and discard oversize frame

Eric Boudrand eric at boudrand.net
Wed Oct 31 04:11:22 PDT 2007


I am running a FreeBSD router with two ethernet cards. I have reduced
the MTU to 800 in order to generate ICMP packet "Fragmentation needed
but DF was set". I can find in log :

rl1: discard oversize frame (ether type 800 flag 3 len 875 > max 814)

But there is no ICMP sent. By default, is this feature disabled ? How 
can I see these ICMP packets generated ?



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