SMB> Date: Mon, 29 Sep 2003 16:10:59 -0400 SMB> From: Steven M. Bellovin SMB> No, they use icmp. Or at least that's what the XP box SMB> sitting next to me does... AFAIK, it's been that way since Win95. I recall a certain vendor's dodgy ISDN router * * * on Windows traceroute, but working fine under *ix... for whatever reason, said router didn't like the ICMP traceroute, but returned unreachables in response to UDP when TTL expired. Eddy -- Brotsman & Dreger, Inc. - EverQuick Internet Division Bandwidth, consulting, e-commerce, hosting, and network building Phone: +1 785 865 5885 Lawrence and [inter]national Phone: +1 316 794 8922 Wichita _________________________________________________________________ DO NOT send mail to the following addresses : blacklist@brics.com -or- alfra@intc.net -or- curbjmp@intc.net Sending mail to spambait addresses is a great way to get blocked.