Comparing the output of `ip -6 a`, you can see that the dynamic
addresses are no longer at the top of the list, where they should be.
Before (network-manager 1.36.4):
2: eno0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 state UP qlen 1000
inet6 2a10:3781:xxxx::bd0/128 scope global dynamic noprefixroute
valid_lft 43193sec preferred_lft 43194sec
inet6 fd10:3781:xxxx::bd0/128 scope global dynamic noprefixroute
valid_lft 43193sec preferred_lft 43194sec
inet6 fd10:3781:xxxx:0:9875:4dec:b9f9:e768/64 scope global noprefixroute
valid_lft forever preferred_lft forever
inet6 2a10:3781:xxxx:0:f802:2428:9af1:dcb3/64 scope global noprefixroute
valid_lft forever preferred_lft forever
inet6 fe80::36e2:ec4c:fddb:3c89/64 scope link noprefixroute
valid_lft forever preferred_lft forever
After (network-manager 1.36.6):
2: eno0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 state UP qlen 1000
inet6 fd10:3781:xxxx:0:9875:4dec:b9f9:e768/64 scope global noprefixroute
valid_lft forever preferred_lft forever
inet6 2a10:3781:xxxx:0:f802:2428:9af1:dcb3/64 scope global noprefixroute
valid_lft forever preferred_lft forever
inet6 2a10:3781:xxxx::bd0/128 scope global dynamic noprefixroute
valid_lft 43194sec preferred_lft 43194sec
inet6 fd10:3781:xxxx::bd0/128 scope global dynamic noprefixroute
valid_lft 43194sec preferred_lft 43194sec
inet6 fe80::36e2:ec4c:fddb:3c89/64 scope link noprefixroute
valid_lft forever preferred_lft forever
On another machine with Debian sid and network-manager 1.38.0, it looks
like the way it should be again (dynamic addresses at the top of the
list, preferred to autoconfigured / temporary addresses):
2: wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 state UP qlen 1000
inet6 fd10:3781:xxxx::5bf/128 scope global dynamic noprefixroute
valid_lft 43193sec preferred_lft 43193sec
inet6 2a10:3781:xxxx::5bf/128 scope global dynamic noprefixroute
valid_lft 43193sec preferred_lft 43193sec
inet6 2a10:3781:xxxx:0:42cd:4f1b:89b8:77fd/64 scope global noprefixroute
valid_lft forever preferred_lft forever
inet6 fd10:3781:xxxx:0:8a59:df52:9ea1:e7c8/64 scope global noprefixroute
valid_lft forever preferred_lft forever
inet6 fe80::a738:71dc:f10e:924e/64 scope link noprefixroute
valid_lft forever preferred_lft forever
So this bug was not present in NetworkManager 1.36.4, introduced in
1.36.6, and then fixed in 1.38.0.
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https://bugs.launchpad.net/bugs/1977619
Title:
DHCPv6 addresses are no longer preferred over SLAAC addresses
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