RE: [Xen-users] Re: [Xen-devel] Release 0.8.5 of GPL PV drivers forWindows

["James Harper" <james.harper@xxxxxxxxxxxxxxxx>]

> On Thursday 13 March 2008 08:54:03 am Pasi Kärkkäinen wrote:
> > Hmm.. is it possible to set the MTU for xennet? Does it support Jumbo
> > frames (MTU 9000)?
> 
> How good is Windows PMTUDiscovery setting? Will it automatically send
> 1492/1500 MTU packets to the internet after a couple of packets, or is my
> router going to be doing the job of assembling & disassembling? Thanx.

Windows PMTU is as good as any other OS afaict. Provided the router can send 
back a ICMP Fragmentation Required packet, and nothing in between is blocking 
it, it should work just fine.

In addition, windows can do a more intelligent discovery where if packets 
aren't getting through and it doesn't get a response, it will try sending 
smaller packets. Whether this is a good thing in the long term is questionable 
though, as it just fixes the symptoms and not the problem.

James

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