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Is it possible to define MTU on an interface with different values for IPv4 and IPv6 on a Linux machine? It seems that command ifconfig MTU defines the same MTU for both IPv4 and IPv6.
Any help is appreciated.

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  • What distribution are you on?
    – Fanatique
    Jul 18, 2018 at 12:19

1 Answer 1

Reset to default
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This might help you. Setting a higher value in 

 /proc/sys/net/ipv6/conf/eth0/mtu 


command sudo sh -c "echo 0 > /proc/sys/net/ipv6/conf/eth0/mtu

But turns out it can be reset regularly by the router. Quote from a comment in this link. How to configure a large mtu (linux)

This value gets updated/reset regularly through Router Advertisement. RA can be disabled by writing 0 to accept_ra in the same folder under /proc.

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    Of course if you don't accept RA you might not even get an IPv6 address or route.
    – Michael Hampton
    Jul 18, 2018 at 13:55

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