Date: Wed, 28 Jan 2004 20:49:02 -0500 From: mi+mx@aldan.algebra.com To: net@FreeBSD.org Cc: isp@FreeBSD.org Subject: jumbo-frames on the network Message-ID: <200401282049.02320@misha-mx.virtual-estates.net>
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Hello! Some newer machines on our FreeBSD/Linux/Windows network have 1000BaseT network cards capable of jumbo frames up to 16K (mostly em(4)). They are plugged into a big switch, which supports jumbo frames up to 9K on each port. However, when I try to crank the MTU up on this machines (up to the switch's limitation), weird things start happening -- mostly NFS problems. I can login to a remote host (wich has MTU of 1500), but it will not be able to access the NFS partitions exported by a jumbo-frames enhanced box. Can different MTUs be mixed on the same wire -- in theory (who is to do the fragmentation?) and in practice -- or do we need to isolate these machines on a subnet of their own (so that they can keep fast-talking to each other) and put something dual-homed between them and the rest of the network? Do the logins just work because no packet exceeds 1500 anyway? Thanks for any advice! -mi
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