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From: Frank Knobbe <frank@knobbe.us>
To: stacey@vickiandstacey.com
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Date: 07 Jul 2003 14:23:21 -0500
cc: freebsduk <freebsd-users@uk.freebsd.org>
cc: FreeBSD Questions <freebsd-questions@FreeBSD.ORG>
Subject: Re: Changed ISP now can't get to websites / traceroute
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On Mon, 2003-07-07 at 13:52, Stacey Roberts wrote:

> 2] Does anyone know of any reason why traceroute might fail on FreeBSD,
> but work on Win2K Pro?

Stacey,

FreeBSD uses UDP based traceroute while Windows boxes use ICMP based
traceroute. Some providers (like ComCast cable) block ICMP packets (so
tracert on Windows fails), but let UDP packets through (which means that
BSD based traceroute succeeds).

HTH,
Frank


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