I'm trying to decrease the MTU value on my machine but I receive this response:
[root@apache1bpreprod acn]# ifconfig eth0 mtu 1350
SIOCSIFMTU: Invalid argument
Why? i expect problems to increase not to decrease. Can you help me? Thanks a lot
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Hi, A little more information would be helpful here. What Distro are you using? same error with the command under sudo?– SteseOct 23, 2018 at 8:28
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@Stese: I agree that more information is needed. However, he is logged in as the root user so "sudo" won't do much good here.– TommiieOct 23, 2018 at 8:45
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Well spotted! Apologies.– SteseOct 23, 2018 at 8:47
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2 Answers
I did a little google-foo and came up on this post on NIX_craft. Nix-Craft link to MTU changes
it seems to suggest you need to add the instruction to bring the NIC up, when setting the MTU.
ifconfig eth1 mtu 9000 up
I'd wager you need to bring the NIC down first.
Thanks for support. I tried to set the same value on another Linux machine with the same operating system Red Hat 7.2 and I had not problems. Yesterday instead I set the same value on three Linux machines with Red Hat 7.3 and I had problem with SSH access for two machines. My worry is if the machine will not restart network interface or can create problem with the SSH access.
I would understand if I can proceed with a command as
ifconfig eth0 mtu 1360
that not require a restart of the interface. On this machine I tried to restart the machine without success. Thanks a lot for support.