From: ccie2be (ccie2be@nyc.rr.com)
Date: Wed Jun 15 2005 - 09:04:47 GMT-3
John,
Suppose a router had a bunch of serial interfaces with an MTU of 10,000 and
an ethernet interface with an MTU of 1500.
And, let's say the system MTU was set to 10,000 and the eth interface MTU
was set to 1500.
Now, the router wants to send a packet of size 3000 out the ethernet
interface.
Based on the system MTU, no fragmentation is needed. What does the router
do?
Since it's not possible to send a 3000 byte packet out an ethernet interface
with a max MTU of 1500, I would say the router will fragment that packet.
HTH, Tim
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of John
Matus
Sent: Wednesday, June 15, 2005 12:32 AM
To: ccielab@groupstudy.com
Subject: system mtu
question regarding mtu on an interface and globally and how the 2 interact
with each other...
i think i know part of it but i don't know which direction it works..
is it - if the interface exceeds it's own mtu, then it will fragment
packets in accordance with the system mtu? or is it the other way
around....
or....
is the global mtu the default for all interfaces and the interface mtu just
overrides the global setting?
TIA
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