Red Hat Bugzilla – Bug 106622
(NET R8169) MTU size can't change larger than 1500 with ifconfig command
Last modified: 2013-07-02 22:15:49 EDT
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Description of problem:
When I used ifconfig command to change MTU size for eth0, I can't change the
value larger than 1500.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1.type 'ifconfig eth0 mtu 9000
Actual Results: It gives you a message :
SIOCSIFMTU: Invalid argument
Expected Results: You can change the value of MTU size
You need to give a lot more information, such as
* kernel version
* NIC hardware description
* 'lspci' output
* 'dmesg' output
It may be that your hardware doesn't support jumbo MTUs.
Bug: Redhat ifconfig does not allow you to forcefully set the MTU >
1500. The reason this is bad is that if you have a gigabit ethernet
card on a gig-network you should be able to set it higher for better
I am using a gigbit NIC from hawking. Using drivers r8169. I saw
some things in the driver source file about giga ethernet but it
wasn't clear and anyway the variable was set to 1536 which doesn't
Kernel is: 2.4.18-19.7.x
I think this would be fixed by updating r8169 driver to latest 2.4.x-BK.
This bug is filed against RHEL 3, which is in maintenance phase.
During the maintenance phase, only security errata and select mission
critical bug fixes will be released for enterprise products. Since
this bug does not meet that criteria, it is now being closed.
For more information of the RHEL errata support policy, please visit:
If you feel this bug is indeed mission critical, please contact your
support representative. You may be asked to provide detailed
information on how this bug is affecting you.