I launched a bionic image on serverstack, updated the netplan.io to
proposed, modified the network config to set ipv6-mtu to 6000 and
rebooted.
root@b-test-ipv6-mtu:~# apt-cache policy netplan.io
netplan.io:
Installed: 0.98-0ubuntu1~18.04.1
Candidate: 0.98-0ubuntu1~18.04.1
Version table:
*** 0.98-0ubuntu1~18.04.1 500
500 http://nova.clouds.archive.ubuntu.com/ubuntu bionic-proposed/main
amd64 Packages
100 /var/lib/dpkg/status
0.97-0ubuntu1~18.04.1 500
500 http://nova.clouds.archive.ubuntu.com/ubuntu bionic-updates/main
amd64 Packages
0.40.1~18.04.4 500
500 http://security.ubuntu.com/ubuntu bionic-security/main amd64
Packages
0.36.1 500
500 http://nova.clouds.archive.ubuntu.com/ubuntu bionic/main amd64
Packages
root@b-test-ipv6-mtu:~# cat /etc/netplan/50-cloud-init.yaml
network:
version: 2
ethernets:
ens3:
dhcp4: true
match:
macaddress: fa:16:3e:4d:3c:6a
set-name: ens3
ipv6-mtu: 6000
root@b-test-ipv6-mtu:/run/systemd/network# cat 10-netplan-ens3.link
[Match]
MACAddress=fa:16:3e:4d:3c:6a
[Link]
Name=ens3
WakeOnLan=off
root@b-test-ipv6-mtu:/run/systemd/network# cat 10-netplan-ens3.network
[Match]
MACAddress=fa:16:3e:4d:3c:6a
Name=ens3
[Network]
DHCP=ipv4
LinkLocalAddressing=ipv6
IPv6MTUBytes=6000
[DHCP]
RouteMetric=100
UseMTU=true
~# cat /sys/class/net/ens3/mtu
8958
~# sysctl net.ipv6.conf.ens3.mtu
net.ipv6.conf.ens3.mtu = 8958
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https://bugs.launchpad.net/bugs/1671951
Title:
networkd should allow configuring IPV6 MTU
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/cloud-init/+bug/1671951/+subscriptions
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