Red Hat Bugzilla – Bug 141055
system-config-network needs to be able to set MTU
Last modified: 2007-11-30 17:10:55 EST
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Description of problem:
I'm on a DSL system using PPPoE to encapsulate packets.
Unfortunately, this means the effective MTU of the DSL link is 1492
bytes, and not the default ethernet 1500. I need to set my FC3
system's MTU to 1492 if I want to avoid unecessary packet
fragmentation for DSL traffic.
system-config-network has all kinds of options for editing most
Ethernet device configuration options, but there's no way to change
the MTU, despite other graphical tools being able to show me that the
MTU is set too high.
It would be helpful to add an MTU editing option to a future version
Version-Release number of selected component (if applicable):
Steps to Reproduce:
2.Look for MTU
Having investigated this more, I see that the improper MTU for my
PPPoE link should result in automatic Path MTU discovery, but I've
been seeing symptoms that the MTU is not being set/discovered properly
by my FC 3 system, presumably because somewhere along the path the
ICMP packets are being blocked.
Setting my own MTU in /etc/sysconfig/network-scripts/ifcfg-eth0 seems
to have solved connection hangs that I had, all of which speaks to the
utility of putting MTU into system-config-network.
Fedora Core 3 is now maintained by the Fedora Legacy project for security
updates only. If this problem is a security issue, please reopen and
reassign to the Fedora Legacy product. If it is not a security issue and
hasn't been resolved in the current FC5 updates or in the FC6 test
release, reopen and change the version to match.