ubuntu@lp1850704-b:~$ cat /etc/systemd/network/10-ens3.network
[Match]
Name=ens3
[Network]
DHCP=ipv4
LinkLocalAddressing=ipv6
[Link]
MTUBytes=6666
ubuntu@lp1850704-b:~$ dpkg -l systemd|grep ii
ii systemd 237-3ubuntu10.33 amd64 system and service manager
ubuntu@lp1850704-b:~$ ip l show ens3
2: ens3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 6666 qdisc fq_codel state UP
mode DEFAULT group default qlen 1000
link/ether 52:54:00:86:c7:44 brd ff:ff:ff:ff:ff:ff
ubuntu@lp1850704-b:~$ sudo ip l set mtu 1500 dev ens3
ubuntu@lp1850704-b:~$ ip l show ens3
2: ens3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP
mode DEFAULT group default qlen 1000
link/ether 52:54:00:86:c7:44 brd ff:ff:ff:ff:ff:ff
ubuntu@lp1850704-b:~$ sudo systemctl restart systemd-networkd
ubuntu@lp1850704-b:~$ ip l show ens3
2: ens3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 6666 qdisc fq_codel state UP
mode DEFAULT group default qlen 1000
link/ether 52:54:00:86:c7:44 brd ff:ff:ff:ff:ff:ff
** Tags removed: verification-needed verification-needed-bionic
** Tags added: verification-done verification-done-bionic
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https://bugs.launchpad.net/bugs/1850704
Title:
networkd doesn't set MTUBytes if interface is already up
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