[Expired for network-manager (Ubuntu) because there has been no activity
for 60 days.]
** Changed in: network-manager (Ubuntu)
Status: Incomplete = Expired
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Could it be that this MTU isn't allowed by the network device used? Some
have artificial limits imposed by the drivers.
Can you successfully change the MTU value from the command line?
Try:
ip link set dev eth0 mtu 9000
What does that command return?
** Changed in: network-manager (Ubuntu)
Setting it manually works fine, and I see 9k frames on the wire for IPv6.
Its a I350-T2 Intel server NIC, fairly modern.
Currently I've added a /etc/network/if-up.d/ script to set it every time
the interface comes up (legacy protocols in my networks? never!)
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Oh, and for completeness;
root@slurv:~# ip link set dev eth2 mtu 9000
root@slurv:~# echo $?
0
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https://bugs.launchpad.net/bugs/1061304
Title:
Configured ethernet MTU not set with IPv4
Good enough.
Could you follow the steps at
http://wiki.ubuntu.com/DebuggingNetworkManager and provide a debug log
for NetworkManager so we can see what happens, if anything, when it
tries to set the MTU when briging an IPv6-only network connection up?
Thanks!
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