nanog mailing list archives
Re: ICMP Blocking Woes
From: "Kevin Oberman" <oberman () es net>
Date: Mon, 29 Sep 2003 13:41:17 -0700
From: "Eric Germann" <ekgermann () cctec com> Date: Mon, 29 Sep 2003 15:56:04 -0400 Sender: owner-nanog () merit edu winders does use udp instead of icmp in their tracert program, IIRC (or at least they used to). At the risk of getting my head blown off, could we say that was foresight :)
You have it backwards. Windows tracert uses ICMP while most Unix boxes use the LBNL traceroute program (or something derived from it) which uses UDP. But both rely on the return of ICMP TTL expired or unreachable messages and blocking all ICMP breaks both. -- R. Kevin Oberman, Network Engineer Energy Sciences Network (ESnet) Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab) E-mail: oberman () es net Phone: +1 510 486-8634
Current thread:
- Re: ICMP Blocking Woes, (continued)
- Re: ICMP Blocking Woes Paul Timmins (Sep 29)
- Re: ICMP Blocking Woes E.B. Dreger (Sep 29)
- Re: ICMP Blocking Woes Geo. (Sep 30)
- Re: ICMP Blocking Woes Eric Kagan (Sep 30)
- Re: ICMP Blocking Woes Eric Kagan (Sep 30)
- Re: ICMP Blocking Woes Anthony Cennami (Sep 30)
- Re: ICMP Blocking Woes bdragon (Sep 30)
- Re: ICMP Blocking Woes Crist Clark (Sep 30)
- Re: ICMP Blocking Woes John Kristoff (Sep 30)
- Re: ICMP Blocking Woes Crist Clark (Sep 30)
- Re: ICMP Blocking Woes Kevin Oberman (Sep 29)