Public bug reported:
When IPv6 ND RAs are sent from two different routers, one with Medium
and one with High preferences, systemd-networkd will ignore the fact
they have different preferences and create two multipath routes with the
same weight.
I ran a tcpdump of the RAs and confirmed that both have different
preferences sent.
i.e.
nms-mon1:~$ ip -6 route
2a0d:1a40:7551:6010::/64 dev ens18 proto ra metric 100 pref medium
fe80::/64 dev ens18 proto kernel metric 256 pref medium
default proto ra metric 100
nexthop via fe80::c030:9cff:fe10:3492 dev ens18 weight 1
nexthop via fe80::215:5dff:fe83:c81c dev ens18 weight 1
Ubuntu version: Ubuntu 18.04.4 LTS
systemd version: 237-3ubuntu10.39
** Affects: systemd (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1869961
Title:
systemd-networkd ignores RA preference and creates multipath routes
anyway
Status in systemd package in Ubuntu:
New
Bug description:
When IPv6 ND RAs are sent from two different routers, one with Medium
and one with High preferences, systemd-networkd will ignore the fact
they have different preferences and create two multipath routes with
the same weight.
I ran a tcpdump of the RAs and confirmed that both have different
preferences sent.
i.e.
nms-mon1:~$ ip -6 route
2a0d:1a40:7551:6010::/64 dev ens18 proto ra metric 100 pref medium
fe80::/64 dev ens18 proto kernel metric 256 pref medium
default proto ra metric 100
nexthop via fe80::c030:9cff:fe10:3492 dev ens18 weight 1
nexthop via fe80::215:5dff:fe83:c81c dev ens18 weight 1
Ubuntu version: Ubuntu 18.04.4 LTS
systemd version: 237-3ubuntu10.39
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