North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical RE: Digital Island sponsors DoS attempt?
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 <[email protected]> | We're all wrong.
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