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Dropped over-mtu packet: 1496 > 1450

asked 2017-11-27 05:41:40 -0600

iOsX gravatar image

Hi everyone.

My /var/log/message log file is spamming with dropped over-mtu packets. As far as I know Linux bridges reduce standard MTU from 1500 to 1450, but there are not good messages.

root@rdo-poc [~] tail -f /var/log/messages
Nov 27 21:41:05 rdo-poc kernel: br-int: dropped over-mtu packet: 1496 > 1450
Nov 27 21:41:06 rdo-poc kernel: br-int: dropped over-mtu packet: 1496 > 1450
Nov 27 21:41:06 rdo-poc kernel: br-int: dropped over-mtu packet: 1496 > 1450
Nov 27 21:41:06 rdo-poc kernel: br-int: dropped over-mtu packet: 1496 > 1450
Nov 27 21:41:06 rdo-poc kernel: br-int: dropped over-mtu packet: 1496 > 1450
Nov 27 21:41:06 rdo-poc kernel: br-int: dropped over-mtu packet: 1496 > 1450
Nov 27 21:41:10 rdo-poc kernel: net_ratelimit: 16 callbacks suppressed
Nov 27 21:41:10 rdo-poc kernel: br-int: dropped over-mtu packet: 1496 > 1450
Nov 27 21:41:10 rdo-poc kernel: br-int: dropped over-mtu packet: 1496 > 1450
Nov 27 21:41:10 rdo-poc kernel: br-int: dropped over-mtu packet: 1496 > 1450
Nov 27 21:41:11 rdo-poc kernel: br-int: dropped over-mtu packet: 1496 > 1450
Nov 27 21:41:11 rdo-poc kernel: br-int: dropped over-mtu packet: 1496 > 1450
Nov 27 21:41:11 rdo-poc kernel: br-int: dropped over-mtu packet: 1496 > 1450
Nov 27 21:41:11 rdo-poc kernel: br-int: dropped over-mtu packet: 1496 > 1450

Cannot understand or google the problem.

8: br-int: <BROADCAST,MULTICAST> mtu 1450 qdisc noop state DOWN qlen 1000
    link/ether d6:35:db:48:e4:40 brd ff:ff:ff:ff:ff:ff

Regards Oleg

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answered 2017-12-06 17:50:18 -0600

timi gravatar image

you probably want to increase the nic and bridge mtu ,to something like 9k or so, if supported

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Asked: 2017-11-27 05:41:40 -0600

Seen: 38 times

Last updated: Dec 06