Hi,

When using traceroute with the -F option (do not fragment)

traceroute -F 10.0.0.1

tcpdump shows that traceroute is actually sending out fragments ONLY. (i.e., it does 
not send out a single non fragmented packet). I tried specifying various packet size 
without success.

traceroute -v shows v1.4a5

I see the problem on

. Intel Kernel 2.2.10.
. Alpha Kernel 2.2.6

Path MTU discovery is enabled.


I do NOT see the problem on

. Sparc5 Kernel 2.0.35

Hope this helps.

        Fred.
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