On Tue, Nov 29, 2011 at 12:34 AM, Roland Dobbins
<[email protected]> wrote:
>
> On Nov 29, 2011, at 2:50 AM, Robert Raszuk wrote:
>
>> I think we really need to have a way to determine PMTU in the cases of
>> switch in the middle having a mismatched value.
>
> Shouldn't the root cause of PMTU-D breakage - i.e., overfiltering of the
> requisite ICMP message types - be mentioned and appropriate ICMP filtering
> recommendations be made in order to ensure PMTU-D functionality across IXP
> fabrics making use of jumbo frames?
>
it's not always the filtering of packet-too-big messages though,
sometimes it's filtering of the packet because the source isn't valid
(1918 router interfaces, to take a simple example)
> Also, there's a typo - 'ICMP filtering on the customers router could impeed
> this testing.' should read 'ICMP filtering on the customers router could
> impede this testing.'.
customer's router
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