Bug 8920 - Can't set interface MTU with ifconfig
Can't set interface MTU with ifconfig
Status: CLOSED DUPLICATE of bug 9215
Product: Red Hat Linux
Classification: Retired
Component: net-tools (Show other bugs)
i386 Linux
medium Severity medium
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Assigned To: Crutcher Dunnavant
Depends On: 9215
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Reported: 2000-01-27 09:35 EST by eugene
Modified: 2008-05-01 11:37 EDT (History)
0 users

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Doc Type: Bug Fix
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Last Closed: 2000-10-07 11:10:45 EDT
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Description eugene 2000-01-27 09:35:39 EST
Trying to set the MTU value for an interface:
ifconfig eth0 mtu 1400
--causes the following error.
SIOCSIFMTU:Invalid argument

A workaround appears to be:
echo 1 > /proc/sys/net/ipv4/ip_always_defrag
echo 1 > /proc/sys/net/ipv4/ip_no_pmtu_disc

This error occurred after upgrading to 6.1.
I was able to use ifconfig to set the MTU on a different machine (identical
processors and ethernet cards) that had 6.1 installed on it originally.
Comment 1 Elliot Lee 2000-02-03 15:29:59 EST
I can't reproduce this problem on either of my boxen. It may be that your
networking configuration is different on the upgraded system, and a
feature/limitation of the kernel or hardware is preventing you from changing the
Comment 2 Jeff Johnson 2000-10-07 11:08:53 EDT

*** This bug has been marked as a duplicate of 9129 ***
Comment 3 Jeff Johnson 2000-10-07 11:11:14 EDT

*** This bug has been marked as a duplicate of 9215 ***

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