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Date:	Tue, 30 Sep 2003 10:34:10 PDT7
From:	Peter Skye <pskye@peterskye.com >
Reply-To:	scoug-help@scoug.com
To:	scoug-help@scoug.com
Subject:	SCOUG-Help: Traceroute

Content Type: text/plain

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Dr. Jeffrey Race wrote:
>
> I see some traffic on the NANOG group about
> ICMP blocking of packets of a certain size.
> Could this be why my Win98 fails?

TRACEROUTE is based on the Time-To-Live (TTL) value in each
packet. Every router subtracts 1 from the value before
sending the packet to the next hop. When the value reaches
0 the packet is returned along with the name of the router
returning it. That's how TRACEROUTE works -- it sends out
multiple packets with TTL values of 1, 2, 3 etc and thus
receives back the name of the router after 1 hop, after 2
hops, after 3 hops etc.

If the Windows TRACEROUTE offers a way to set the packet
size then give it a try. On OS/2 you can set the packet
size.

> Sample failed Win98 probe:
>
> Tracing route to www.camblab.com [63.251.137.21]
> over a maximum of 30 hops:
> 1 1 ms 2 ms 1 ms 192.168.0.1
> 2 3 ms 3 ms 3 ms 192.168.1.1
> 3 66 ms 66 ms 66 ms 10.20.12.9
> 4 * * * Request timed out.
>
> Sample probe in OS/2
>
> 1 192.168.0.1 (192.168.0.1) 0 ms 0 ms 10 ms
> 2 192.168.1.1 (192.168.1.1) 0 ms 0 ms 0 ms
> 3 10.20.12.9 (10.20.12.9) 60 ms 50 ms 50 ms
> 4 ppp-203.144.161.5.revip.asianet.co.th (203.144.161.5) 60 ms

Looks like asianet.co.th doesn't like the Windows TRACEROUTE
packets.

- Peter

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