This is still happening with 237-3ubuntu10.42 in Bionic. RA routes
announced with lifetime of 0s are not removed. It is the firewall which
used to be the default router which (continously) announce these 0s
lifetimes to make sure there are no issues with failover.
$ ip -6 route show default
default proto ra metric 100
nexthop via fe80::21b:21ff:febc:97e6 dev eth0 weight 1
nexthop via fe80::21b:21ff:febc:9416 dev eth0 weight 1
$ sudo rdisc6 eth0
Soliciting ff02::2 (ff02::2) on eth0...
Hop limit : 64 ( 0x40)
Stateful address conf. : No
Stateful other conf. : No
Mobile home agent : No
Router preference : medium
Neighbor discovery proxy : No
Router lifetime : 0 (0x00000000) seconds
Reachable time : unspecified (0x00000000)
Retransmit time : unspecified (0x00000000)
Recursive DNS server : 2a02:c0::1
DNS server lifetime : 2419200 (0x0024ea00) seconds
from fe80::21b:21ff:febc:9416
Hop limit : 64 ( 0x40)
Stateful address conf. : No
Stateful other conf. : No
Mobile home agent : No
Router preference : medium
Neighbor discovery proxy : No
Router lifetime : 0 (0x00000000) seconds
Reachable time : unspecified (0x00000000)
Retransmit time : unspecified (0x00000000)
Recursive DNS server : 2a02:c0::1
DNS server lifetime : 2419200 (0x0024ea00) seconds
from fe80::21b:21ff:febc:9416
Hop limit : 64 ( 0x40)
Stateful address conf. : No
Stateful other conf. : No
Mobile home agent : No
Router preference : medium
Neighbor discovery proxy : No
Router lifetime : 30 (0x0000001e) seconds
Reachable time : unspecified (0x00000000)
Retransmit time : unspecified (0x00000000)
Prefix : 2a02:c0:900:113::/64
On-link : Yes
Autonomous address conf.: Yes
Valid time : 86400 (0x00015180) seconds
Pref. time : 14400 (0x00003840) seconds
Recursive DNS server : 2a02:c0::1
DNS server lifetime : 2419200 (0x0024ea00) seconds
from fe80::21b:21ff:febc:97e6
Hop limit : 64 ( 0x40)
Stateful address conf. : No
Stateful other conf. : No
Mobile home agent : No
Router preference : medium
Neighbor discovery proxy : No
Router lifetime : 30 (0x0000001e) seconds
Reachable time : unspecified (0x00000000)
Retransmit time : unspecified (0x00000000)
Prefix : 2a02:c0:900:113::/64
On-link : Yes
Autonomous address conf.: Yes
Valid time : 86400 (0x00015180) seconds
Pref. time : 14400 (0x00003840) seconds
Recursive DNS server : 2a02:c0::1
DNS server lifetime : 2419200 (0x0024ea00) seconds
from fe80::21b:21ff:febc:97e6
** Changed in: systemd (Ubuntu)
Status: Expired => Confirmed
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https://bugs.launchpad.net/bugs/1800836
Title:
systemd-networkd doesn't process IPv6 RA properly
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