On Jul 12, 2007, at 12:34 PM, Stephen Clark wrote:
Did something change in 6.2? If my mtu size on rl0 is 1280 it won't
accept a larger incoming packet.
Nothing changed; that is the expected behavior.
(Modulo support for 4-byte VLAN tags.)
kernel: rl0: discard oversize frame (ether type 800 flags 3 len
1514 > max
1294)
I don't think it worked this way in the past.
Well, it did. :-)
Won't this affect pmtud?
Nope.
man page for ifconfig says mtu limits size of "transmission" not
reception.
"mtu n Set the maximum transmission unit of the interface to
n, default
is interface specific."
The MTU is actually defined in reference to a network segment such as
an "ethernet collision domain", and applies to all machines sending
traffic to that segment. If the MTU is really 1280, nobody else
should be sending larger packets, and the drivers will drop any
larger packets they receive and generate the appropriate ICMP error....
--
-Chuck
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