North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: PMTU and Broken Servers
On Thu, May 08, 2003 at 07:04:18PM +0200, Mikael Abrahamsson wrote: > > On Thu, 8 May 2003, Leo Bicknell wrote: > > > Could you define newer? My limited testing with 12.0S and 12.2something > > shows both returing MTU can't be set on a tunnel interface. > > You cannot change the MTU of the tunnel, but you can change the "ip mtu" > of the tunnel. I've done this on 7200 and 1600 that are running IOSes that > are at least a year old. The feature is at least 2-3 years old, because > that's the first time I encountered it. > > The router will do re-assembly on the tunnel level to be able to transfer > a 1500 byte sized IP packet non-fragmented. Be warned, while fragmentation follows some form of fast path, reassembly is process switched. A beefy 7206 will fragment 300Mbps easily, but will reassemble around 30Mbps. -- Richard A Steenbergen <[email protected]> http://www.e-gerbil.net/ras GPG Key ID: 0xF8B12CBC (7535 7F59 8204 ED1F CC1C 53AF 4C41 5ECA F8B1 2CBC)
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