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Date: Fri, 26 Oct 2001 14:44:46 -0400 (EDT) From: Bob K <melange@yip.org> To: "Quibell, Marc" <mquibell@icn.state.ia.us> Cc: nanog@merit.edu In-Reply-To: <EF4A9841BCC9D5119E28009027923DF0137073@yosemite.icn.state.ia.us> Message-ID: <Pine.BSF.4.21.0110261433260.1593-100000@pi.yip.org> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Errors-To: owner-nanog-outgoing@merit.edu On Fri, 26 Oct 2001, Quibell, Marc wrote: > Finally, I do not believe PMTU uses pings to discover the PMTU. I believe it > uses TCP or UDP packets at the layers above IP, and it DOES use "ICMP Packet > Too big" responses (from the receiver) to cut it's packet size. So in > reality, a router blocking ICMP from being routed through can still send > these ICMP messages PMTU needs. Is this how you understand it? Don't forget that routers or hosts beyond (from the point of view of the host attempting PMTU) your ICMP-blocking router may have smaller MTUs than the norm and may be trying to send ICMP errors back... -- Bob <melange@yip.org> | We're all wrong.
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