Intel NICs, Cisco, autoneg, and borken-ness
Neil Schelly
neil at jenandneil.com
Mon Mar 13 13:50:01 EST 2006
On Monday 13 March 2006 01:30 pm, Michael ODonnell wrote:
> > For what it's worth the default traceroute on Unix-ish systems
> > uses UDP, not ICMP. traceroute -I (capital "eye") would use ICMP.
>
> Que? How does that work? I only know about that bump-the-TTL-after-
> every-hop trick.
UDP packets also have TTL settings. The response from the particular router
that hits that TTL is still ICMP (time-exceeded), but the outgoing traffic is
UDP.
man traceroute
-N
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