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    SubjectRe: A router bug?
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    >     in the "Fragmentation Needed" message, and IP will use it.
    > If the gateway does not provide next hop information, then IP
    > will reduce the MTU to the next lower value taken from a table
    > of "popular" media MTUs.

    Thats what we do

    > o An ICMP "Echo Request" of full MTU size is generated and
    > sent out with the "Don't Fragment" bit on.

    and bounces off every firewall which is correctly configured. A good 50%
    or more of major sites block icmp echo, 90% of them get it right. Also it
    isnt required for an end host to support frames >576 bytes except by
    prior agreement (hence TCP MSS option).

    > it. [0,2] Default: Strategy 2

    ie nasty hack. Unclean unclean 8)

    Alan


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