Date: Fri, 13 Jul 2007 13:31:10 -0700 From: Chuck Swiger <cswiger@mac.com> To: Stephen.Clark@seclark.us Cc: freebsd-net@freebsd.org Subject: Re: 6.2 mtu now limits size of incomming packet Message-ID: <D917389D-9621-4997-9EF8-78B5B4BE2E28@mac.com> In-Reply-To: <4697DF64.9070203@seclark.us> References: <46967C5C.5040505@seclark.us> <469772DA.1000700@gmail.com> <46977741.8090301@seclark.us> <20070713093408.b8a92c23.wmoran@collaborativefusion.com> <4697A60C.4090409@seclark.us> <20070713130402.ed2f79ce.wmoran@collaborativefusion.com> <20070713180840.GB8392@verio.net> <20070713152725.6ae40056.wmoran@collaborativefusion.com> <A315A8C8-1BF5-4C67-86D8-073AB19E3604@mac.com> <4697DF64.9070203@seclark.us>
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On Jul 13, 2007, at 1:24 PM, Stephen Clark wrote: >> Designers of gateways should be prepared for the fact that >> successful >> gateways will be copied and used in other situation and >> installations. Gateways must be prepared to accept datagrams as >> large as can be sent in the maximum packets of the directly >> attached >> networks. > > Doesn't this imply if a gateway has 2 interfaces, one with an mtu > of 1280 and the other > with an mtu of 1500 it should accept 1500 on either interface? Agreed-- if the traffic is going towards the network on the interface with the 1280 MTU, the gateway should accept and then either fragment such traffic or drop it, depending on whether DF is set. -- -Chuck
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