wrong mtu value in /proc/net/route

From: Bruce Cran (bruce@cran.org.uk)
Date: Thu Jul 25 2002 - 16:34:11 EST

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I've found something strange going on in 2.4 kernels - when I run
'netstat -r' I get the routing table from /proc/net/route. The MSS
value reported is only 40 bytes, and when I run 'cat
/proc/net/route I'm told that the _MTU_ is 40 bytes. I thought the MSS was
supposed to be the MTU - 40 bytes, not 40 bytes in
total, where the MTU for ethernet is 1500. If I run ifconfig, it reports the
correct MTU of 1500 for eth0 and 16463 for lo. This computer has a NetGear
FA311 card, and is running 2.4.19-pre7-ac2, though I've also seen this
happening on a 2.4.18 kernel.

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