HUH! What corner cases?? This thread was about TCP:(ip tcp adjust-mss)not UDP! As, has been already pointed out:
To OP: Put in the little-effort required to UP MTU's on your physical-interfaces to support your services and as already-mentioned, design/re-design your network accordingly. "ip-mtu and mtu(physical-int) are two very different things. ./Randy --- On Tue, 2/12/13, Mack McBride <mack.mcbr...@viawest.com> wrote: > From: Mack McBride <mack.mcbr...@viawest.com> > Subject: Re: [c-nsp] ip tcp adjust-mss > To: "Alexander Arseniev" <ecra...@hotmail.com>, "moua0...@umn.edu" > <moua0...@umn.edu>, "cisco-nsp@puck.nether.net" <cisco-nsp@puck.nether.net> > Date: Tuesday, February 12, 2013, 9:31 AM > There are always corner cases. > That's why I said most. > > LR Mack McBride > Network Architect > > From: Alexander Arseniev [mailto:ecra...@hotmail.com] > Sent: Tuesday, February 12, 2013 9:03 AM > To: Mack McBride; moua0...@umn.edu; > cisco-nsp@puck.nether.net > Subject: RE: [c-nsp] ip tcp adjust-mss > > > > From: mack.mcbr...@viawest.com<mailto:mack.mcbr...@viawest.com> > > To: moua0...@umn.edu<mailto:moua0...@umn.edu>; > cisco-nsp@puck.nether.net<mailto:cisco-nsp@puck.nether.net> > > Date: Mon, 11 Feb 2013 16:19:35 -0800 > > Subject: Re: [c-nsp] ip tcp adjust-mss > > > > Most UDP should not hit the MTU limitation. > > The common ones that come to mind are streaming > audio/video and DNS. > > > > LR Mack McBride > > Network Architect > > > Wrt "streaming audio/video" - it depends on client/server > combo. > I recently saw an issue with RTSP video streaming from > repubblica.it website using Samsung Galaxy RSTP client. > If UDP video packets are fragmented due to too small MTU in > the path, video does not play at all. > And DNS is somewhat invalid example since when DNS reply > does not fit into 512 bytes, then DNS server will set a > Truncated bit in the packet, forcing client to use TCP. > http://serverfault.com/questions/348399/force-forwarder-dns-requests-to-tcp-mode > No one uses 512B MTU (apart from miltary who use even > smaller MTU) and DNS over UDP would not be experiencing > issues due to too small MTU because own DNS payload limit is > smaller than smallest real MTUs out there (except military > as I mentioned). > Thanks > Alex > _______________________________________________ > cisco-nsp mailing list cisco-nsp@puck.nether.net > https://puck.nether.net/mailman/listinfo/cisco-nsp > archive at http://puck.nether.net/pipermail/cisco-nsp/ > _______________________________________________ cisco-nsp mailing list cisco-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
