03-29-2009 02:34 AM - edited 03-06-2019 04:52 AM
Dear All,
I want to change the MTU Size on the interface to overcome DOS attacks. In my 7609 on gigabit ethernet interface i get only 9216 MTU size. How do i enable MTU size of 1556 for an example. Please assist me on this to overcome the issue ASAP.
Many Thanks,
Saran
03-29-2009 05:02 AM
Hello Saran,
you can override mtu settings on a per interface basis
L2 interface
use
mtu 1576
L3 interface
you can use
ip mtu 1556
or again the mtu command that should take in account Ethernet overhead
notice that mtu command applies to all upper layer protocols not only ipv4 but also ipv6 or clns packets for isis.
if using a routing protocol over it like OSPF you need to modify on both sides of the link.
Hope to help
Giuseppe
03-29-2009 05:34 AM
In interface configuration mode i am getting only 9216 MTU size its not allowing to set defined MTU size. Please suggest.
Many Thanks,
Saran.
03-29-2009 05:47 AM
Hello Saran,
try on the SVI interfaces for the vlans permitted on the link if it is a L2 trunk.
By the way, the port is part of what linecard ?
What IOS version are you using ?
if you like you can post
sh module
sh ver
and sh run interface type x/y
Hope to help
Giuseppe
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