Subject: RE: traceroute - again
From: Leif Sawyer (lsawyer@gci.com)
Date: Wed Jan 29 2003 - 09:03:23 AKST
PING : Uses ICMP Echo, ICMP Echo-Reply to establish host awareness
TRACEROUTE: Uses UDP port 33434 as a probe (because 33434 is usually
not 'listening' for connections
as well as ICMP Timeout.
If you don't have ICMP Timeouts enabled on your firewall (as well as udp
port 33434), traceroute
will not work for you..
> -----Original Message-----
> From: Jim Gribbin [mailto:jgribbin@alaska.net]
> Sent: Monday, January 27, 2003 11:23 PM
> To: AKLUG
> Subject: traceroute - again
>
>
>
> I got traceroute to work, still don't quite understand.
>
> I used traceroute with '-I' which tell it to use ICMP ECHO instead of
> UDP datagrams. I don't know enough (yet) to know the difference.
>
> BTW - ICMP is specifically allowed on my router by default, it can be
> turned off.
>
> Jim Gribbin
>
>
>
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This archive was generated by hypermail 2a23 : Wed Jan 29 2003 - 09:04:29 AKST