Re: Router appears in tracert but can't ping?
On Tue, 17 Jun 2003 16:05, Stefan Neufeind wrote:
> both tracert and ping use ICMP. So did they just block some kind of
> ICMP-message (ping) for this router? How could I solve this problem?
Your message was not clear, but it seems that you can see the router on a
traceroute but can't ping it.
Ping sends ICMP-ECHO packets and solicits a direct response. traceroute sends
an ICMP-ECHO or a UDP packet destined for some machine beyond the router and
the router sends back an ICMP time-exceeded if it's hop count has expired.
Configuring a router to not respond to any packets addressed to itself is not
uncommon, but having it send ICMP messages about packets addressed to other
machines that it can't deliver is expected.
For this reason it's not uncommon to see traceroute show 10.x.x.x or
192.168.x.x addresses (which are obviously not pingable).
I'm not sure how the Windows program tracert compares in functionality to
traceroute.
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