Date: Mon, 24 Jan 2005 18:54:29 +0100 From: Marian Durkovic <md@bts.sk> To: Clark Gaylord <gaylord@dirtcheapemail.com> Subject: Re: Making ICMP the default traceroute protocol? Message-ID: <20050124175429.GA96355@us.svf.stuba.sk> Resent-Message-ID: <200501241803.j0OI3uWl097080@us.svf.stuba.sk> In-Reply-To: <41F52B41.4090706@dirtcheapemail.com> References: <20050124160242.GA91593@us.svf.stuba.sk> <41F52B41.4090706@dirtcheapemail.com>
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> I disagree. Firstly, IWFs tend to also block ICMP. Secondly, routers > sometimes queue ICMP differently than UDP (not just in their own > processing, which they almost always do, but also in their forwarding), > giving even more distortion to these data than they naturally possess > otherwise. Well, that's true, however, the backward packets of traceroute probes are ICMP "ttl exceeded" anyway... The main motivation I'm proposing this is significantly less support for UDP traceroutes that ICMP traceroutes. Several important www sites have dropped UDP traceroute support (try e.g. www.cisco.com, www.google.com, www.dtag.de or many many others). Also on intranet level, WinXP boxes with SP2 installed have no support for UDP traceroutes either. > If you are finding that your destinations tend to need ICMP, I'd > recommend aliasing traceroute to "traceroute -I". Of course I have "traceroute -P icmp" in my alias list for some time, which fixes the problem for me, however I just think it's better to have it as default and use UDP/TCP just for experienced users which exactly know what they're doing... With kind regards, M. -------------------------------------------------------------------------- ---- ---- ---- Marian Durkovic network manager ---- ---- ---- ---- Slovak Technical University Tel: +421 2 524 51 301 ---- ---- Computer Centre, Nam. Slobody 17 Fax: +421 2 524 94 351 ---- ---- 812 43 Bratislava, Slovak Republic E-mail/sip: md@bts.sk ---- ---- ---- --------------------------------------------------------------------------
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