Using systemd 237-3ubuntu10.10
Using: [Match] Name=ens3 [Network] DHCP=ipv4 IPv6MTUBytes=1600 [Link] MTUBytes=1800 [DHCP] UseMTU=no RouteMetric=100
I do get:
$ cat /sys/class/net/ens3/mtu 1800 $ cat /proc/sys/net/ipv6/conf/ens3/mtu 1600
Thus one can set a different from the device, ipv6-specific mtu.
Using systemd 237-3ubuntu10.10
Using:
[Match]
Name=ens3
[Network]
DHCP=ipv4
IPv6MTUBytes=1600
[Link]
MTUBytes=1800
[DHCP]
UseMTU=no
RouteMetric=100
I do get:
$ cat /sys/class/ net/ens3/ mtu net/ipv6/ conf/ens3/ mtu
1800
$ cat /proc/sys/
1600
Thus one can set a different from the device, ipv6-specific mtu.