bionic:
root@lp1867375-b:~# cat /etc/systemd/network/10.network
[Match]
Name=eth0
[Network]
DHCP=ipv4
LinkLocalAddressing=ipv6
[DHCP]
RouteMetric=100
UseMTU=true
UseRoutes=false
UseGateway=true
root@lp1867375-b:~# dpkg -l systemd|grep systemd
ii systemd 237-3ubuntu10.40 amd64 system and service manager
root@lp1867375-b:~# systemctl restart systemd-networkd
root@lp1867375-b:~# ip a show eth0
102: eth0@if103: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state
UP group default qlen 1000
link/ether 00:16:3e:f8:cb:57 brd ff:ff:ff:ff:ff:ff link-netnsid 0
inet 10.202.51.83/24 brd 10.202.51.255 scope global dynamic eth0
valid_lft 3598sec preferred_lft 3598sec
inet6 fe80::216:3eff:fef8:cb57/64 scope link
valid_lft forever preferred_lft forever
root@lp1867375-b:~# ip r
10.202.51.0/24 dev eth0 proto kernel scope link src 10.202.51.83
root@lp1867375-b:~# dpkg -l systemd|grep systemd
ii systemd 237-3ubuntu10.41 amd64 system and service manager
root@lp1867375-b:~# systemctl restart systemd-networkd
root@lp1867375-b:~# ip a show eth0
102: eth0@if103: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state
UP group default qlen 1000
link/ether 00:16:3e:f8:cb:57 brd ff:ff:ff:ff:ff:ff link-netnsid 0
inet 10.202.51.83/24 brd 10.202.51.255 scope global dynamic eth0
valid_lft 3598sec preferred_lft 3598sec
inet6 fe80::216:3eff:fef8:cb57/64 scope link
valid_lft forever preferred_lft forever
root@lp1867375-b:~# ip r
default via 10.202.51.1 dev eth0 proto dhcp src 10.202.51.83 metric 100
10.202.51.0/24 dev eth0 proto kernel scope link src 10.202.51.83
10.202.51.1 dev eth0 proto dhcp scope link src 10.202.51.83 metric 100
and to verify UseRoutes still works:
root@lp1867375-b:~# cat /etc/systemd/network/10.network
[Match]
Name=eth0
[Network]
DHCP=ipv4
LinkLocalAddressing=ipv6
[DHCP]
RouteMetric=100
UseMTU=true
UseRoutes=false
#UseGateway=true
root@lp1867375-b:~# systemctl restart systemd-networkd
root@lp1867375-b:~# ip r
10.202.51.0/24 dev eth0 proto kernel scope link src 10.202.51.83
** Tags removed: verification-needed verification-needed-bionic
** Tags added: verification-done verification-done-bionic
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https://bugs.launchpad.net/bugs/1867375
Title:
systemd-networkd: UseRoutes behavior change with introduction of
UseGateway param
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