Hi I just tried to reproduce both problems and was unable to do so. So either it is fixed, which would need a new test from you, or it requires something more.
For #1136792: | root@localhost:~# uname -a | Linux localhost 7.0.9+deb14-amd64 #1 SMP PREEMPT_DYNAMIC Debian 7.0.9-1 (2026-05-22) x86_64 GNU/Linux | root@localhost:~# sysctl net.ipv6.conf.enp0s2.accept_ra net.ipv6.conf.enp0s2.use_tempaddr | net.ipv6.conf.enp0s2.accept_ra = 1 | net.ipv6.conf.enp0s2.use_tempaddr = 2 | root@localhost:~# ip -6 addr show enp0s2 | 2: enp0s2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000 | altname enx525400123456 | inet6 fe00::5054:ff:fe12:3456/64 scope global mngtmpaddr noprefixroute | valid_lft forever preferred_lft forever | inet6 fe00::33d3:2f4d:6038:a6cf/64 scope global temporary dynamic | valid_lft 172605sec preferred_lft 86140sec | inet6 fe80::5054:ff:fe12:3456/64 scope link proto kernel_ll | valid_lft forever preferred_lft forever | root@localhost:~# ip link add dummy0 type dummy; ip link del dummy0 [wait for an RA] | root@localhost:~# ip -6 addr show enp0s2 | 2: enp0s2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000 | altname enx525400123456 | inet6 fe00::5054:ff:fe12:3456/64 scope global mngtmpaddr noprefixroute | valid_lft forever preferred_lft forever | inet6 fe00::33d3:2f4d:6038:a6cf/64 scope global temporary dynamic | valid_lft 171957sec preferred_lft 85492sec | inet6 fe80::5054:ff:fe12:3456/64 scope link proto kernel_ll | valid_lft forever preferred_lft forever For #1136793: | root@localhost:~# sysctl net.ipv6.conf.enp0s2.temp_prefered_lft net.ipv6.conf.enp0s2.temp_valid_lft | net.ipv6.conf.enp0s2.temp_prefered_lft = 20 | net.ipv6.conf.enp0s2.temp_valid_lft = 120 | root@localhost:~# ip -6 addr show enp0s2 | 2: enp0s2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000 | altname enx525400123456 | inet6 fe00::5054:ff:fe12:3456/64 scope global dynamic mngtmpaddr proto kernel_ra | valid_lft forever preferred_lft forever | inet6 fe00::880d:2796:752:e81d/64 scope global temporary deprecated dynamic | valid_lft 90sec preferred_lft 0sec | inet6 fe00::58ec:7f2a:fb9b:ff7d/64 scope global temporary deprecated dynamic | valid_lft 93sec preferred_lft 0sec | inet6 fe00::c217:e2c1:af49:9bd3/64 scope global temporary deprecated dynamic | valid_lft 95sec preferred_lft 0sec | inet6 fe00::908d:7465:2536:aa55/64 scope global temporary deprecated dynamic | valid_lft 97sec preferred_lft 0sec | inet6 fe00::dd0d:8a16:e7ab:20f3/64 scope global temporary deprecated dynamic | valid_lft 99sec preferred_lft 0sec | inet6 fe00::e0ff:4df9:ee20:e60f/64 scope global temporary deprecated dynamic | valid_lft 101sec preferred_lft 0sec | inet6 fe00::b8f7:53f3:75e8:a817/64 scope global temporary deprecated dynamic | valid_lft 103sec preferred_lft 0sec | inet6 fe00::bf10:a064:68ee:f318/64 scope global temporary deprecated dynamic | valid_lft 105sec preferred_lft 0sec | inet6 fe00::4b91:791a:9dd9:95b9/64 scope global temporary deprecated dynamic | valid_lft 108sec preferred_lft 0sec | inet6 fe00::83d:cf90:bebf:844c/64 scope global temporary deprecated dynamic | valid_lft 109sec preferred_lft 0sec | inet6 fe00::cd23:48fd:d663:56ca/64 scope global temporary deprecated dynamic | valid_lft 112sec preferred_lft 0sec | inet6 fe00::3c52:34ed:c8aa:16ad/64 scope global temporary dynamic | valid_lft 114sec preferred_lft 1sec | inet6 fe00::6953:1527:57b2:c09d/64 scope global temporary dynamic | valid_lft 116sec preferred_lft 3sec | inet6 fe00::92ab:49f:2ab7:4b19/64 scope global temporary dynamic | valid_lft 117sec preferred_lft 4sec | inet6 fe00::f3d7:47fb:95cc:7080/64 scope global temporary tentative dynamic | valid_lft 119sec preferred_lft 6sec | inet6 fe80::5054:ff:fe12:3456/64 scope link proto kernel_ll | valid_lft forever preferred_lft forever Bastian --
