Messages in this thread | | | From | (Alan Cox) | Subject | Re: A router bug? | Date | Mon, 1 Feb 1999 20:28:07 +0000 (GMT) |
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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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