After update to 23.05 my clients can't connect to IPv6 wan destinations

Hi, my setup seams simple:

I have a cable connection with dualstack. But after update from 22.03 to 23.05 my lan/guest/mgmt clients cannot connect to any wan ipv6 destinations.

ping -6 works from my OpenWRT router, but all clients telling me, that they cant reach the remote network.

user@lxclient:~$ ping -6 google.de -c 1
PING google.de(ham02s21-in-x03.1e100.net (2a00:1450:4005:802::2003)) 56 data bytes
From 2a02:XXXX:c0:5cf0::1 (2a02:XXXX:c0:5cf0::1) icmp_seq=1 Destination unreachable: No route

--- google.de ping statistics ---
1 packets transmitted, 0 received, +1 errors, 100% packet loss, time 0ms

user@lxclient:~$ ip -6 r | grep default
default via fe80::a62b:b0ff:feda:2310 dev eth0 proto ra metric 10 expires 1612sec mtu 1500 pref medium

C:\Users\User>ping -6 google.de -n 1

Ping wird ausgeführt für google.de [2a00:1450:4005:802::2003] mit 32 Bytes Daten:
Zielnetz nicht erreichbar.

Ping-Statistik für 2a00:1450:4005:802::2003:
    Pakete: Gesendet = 1, Empfangen = 0, Verloren = 1
    (100% Verlust),

C:\Users\User>route print | findstr "::/0"
 18    281 ::/0                     fe80::a62b:b0ff:feda:2310

My Router Interfaces

root@gw:~# ip -6 a s br-lan
9: br-lan: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    inet6 2a02:XXXX:c0:5cf0::1/64 scope global dynamic noprefixroute
       valid_lft 83926sec preferred_lft 40726sec
    inet6 fd16:d416:891:99::1/64 scope global noprefixroute
       valid_lft forever preferred_lft forever
    inet6 fe80::a62b:b0ff:feda:2310/64 scope link
       valid_lft forever preferred_lft forever
root@gw:~# tcpdump -ni br-lan "ip6 and icmp6 and ip6[40] <= 129"
tcpdump: verbose output suppressed, use -v[v]... for full protocol decode
listening on br-lan, link-type EN10MB (Ethernet), snapshot length 262144 bytes
18:42:23.101636 IP6 2a02:XXXX:c0:5cf0:bf1c:ad79:613a:1017 > 2a00:1450:4005:801::2003: ICMP6, echo request, id 1, seq 10900, length 40
18:42:23.101783 IP6 2a02:XXXX:c0:5cf0::1 > 2a02:XXXX:c0:5cf0:bf1c:ad79:613a:1017: ICMP6, destination unreachable, unreachable route 2a00:1450:4005:801::2003, length 88
18:42:23.155172 IP6 2a02:XXXX:c0:5cf0::1 > 2a02:XXXX:c0:5cf0:78fa:5167:e5ef:268f: ICMP6, destination unreachable, unreachable route 2606:4700:10::6814:2aec, length 88
18:42:23.165138 IP6 2a02:XXXX:c0:5cf0::1 > 2a02:XXXX:c0:5cf0:78fa:5167:e5ef:268f: ICMP6, destination unreachable, unreachable route 2606:4700:10::6814:2bec, length 88
18:42:23.194234 IP6 2a02:XXXX:c0:5cf0::1 > 2a02:XXXX:c0:5cf0:bf1c:ad79:613a:1017: ICMP6, destination unreachable, unreachable route 2a01:4f8:212:295b::118, length 80
18:42:24.112353 IP6 2a02:XXXX:c0:5cf0:bf1c:ad79:613a:1017 > 2a00:1450:4005:801::2003: ICMP6, echo request, id 1, seq 10901, length 40
18:42:24.112562 IP6 2a02:XXXX:c0:5cf0::1 > 2a02:XXXX:c0:5cf0:bf1c:ad79:613a:1017: ICMP6, destination unreachable, unreachable route 2a00:1450:4005:801::2003, length 88
18:42:25.120200 IP6 2a02:XXXX:c0:5cf0:bf1c:ad79:613a:1017 > 2a00:1450:4005:801::2003: ICMP6, echo request, id 1, seq 10902, length 40
18:42:25.120346 IP6 2a02:XXXX:c0:5cf0::1 > 2a02:XXXX:c0:5cf0:bf1c:ad79:613a:1017: ICMP6, destination unreachable, unreachable route 2a00:1450:4005:801::2003, length 88
18:42:25.198196 IP6 2a02:XXXX:c0:5cf0::1 > 2a02:XXXX:c0:5cf0:bf1c:ad79:613a:1017: ICMP6, destination unreachable, unreachable route 2a01:4f8:212:295b::118, length 80
18:42:26.128952 IP6 2a02:XXXX:c0:5cf0:bf1c:ad79:613a:1017 > 2a00:1450:4005:801::2003: ICMP6, echo request, id 1, seq 10903, length 40
18:42:26.129092 IP6 2a02:XXXX:c0:5cf0::1 > 2a02:XXXX:c0:5cf0:bf1c:ad79:613a:1017: ICMP6, destination unreachable, unreachable route 2a00:1450:4005:801::2003, length 88
18:42:26.607692 IP6 2a02:XXXX:c0:5cf0::1 > 2a02:XXXX:c0:5cf0:d1fb:81de:caac:2c69: ICMP6, destination unreachable, unreachable route 2a00:1450:4005:802::2002, length 1240
18:42:26.907420 IP6 2a02:XXXX:c0:5cf0::1 > 2a02:XXXX:c0:5cf0:d1fb:81de:caac:2c69: ICMP6, destination unreachable, unreachable route 2a00:1450:4005:802::2002, length 1240
18:42:27.136789 IP6 2a02:XXXX:c0:5cf0:bf1c:ad79:613a:1017 > 2a00:1450:4005:801::2003: ICMP6, echo request, id 1, seq 10904, length 40
18:42:27.136920 IP6 2a02:XXXX:c0:5cf0::1 > 2a02:XXXX:c0:5cf0:bf1c:ad79:613a:1017: ICMP6, destination unreachable, unreachable route 2a00:1450:4005:801::2003, length 88
18:42:27.215448 IP6 2a02:XXXX:c0:5cf0::1 > 2a02:XXXX:c0:5cf0:d1fb:81de:caac:2c69: ICMP6, destination unreachable, unreachable route 2a00:1450:4005:802::2002, length 1240
18:42:27.306275 IP6 2a02:XXXX:c0:5cf0::1 > 2a02:XXXX:c0:5cf0:d1fb:81de:caac:2c69: ICMP6, destination unreachable, unreachable route 2a00:1450:4005:802::2002, length 1240
18:42:27.508080 IP6 2a02:XXXX:c0:5cf0::1 > 2a02:XXXX:c0:5cf0:d1fb:81de:caac:2c69: ICMP6, destination unreachable, unreachable route 2a00:1450:4005:802::2002, length 1240
18:42:27.944310 IP6 2a02:XXXX:c0:5cf0::1 > 2a02:XXXX:c0:5cf0:d1fb:81de:caac:2c69: ICMP6, destination unreachable, unreachable route 2a00:1450:4005:802::2002, length 1240
18:42:27.971220 IP6 2a02:XXXX:c0:5cf0::1 > 2a02:XXXX:c0:5cf0:d1fb:81de:caac:2c69: ICMP6, destination unreachable, unreachable route 2a00:1450:4005:802::2002, length 1240
18:42:27.981080 IP6 2a02:XXXX:c0:5cf0::1 > 2a02:XXXX:c0:5cf0:d1fb:81de:caac:2c69: ICMP6, destination unreachable, unreachable route 2a00:1450:4005:802::2002, length 1240
18:42:28.013781 IP6 2a02:XXXX:c0:5cf0::1 > 2a02:XXXX:c0:5cf0:d1fb:81de:caac:2c69: ICMP6, destination unreachable, unreachable route 2600:1f13:800:7780:f34e:2fd8:b49f:b9ec, length 88
18:42:28.018579 IP6 2a02:XXXX:c0:5cf0::1 > 2a02:XXXX:c0:5cf0:d1fb:81de:caac:2c69: ICMP6, destination unreachable, unreachable route 2600:1f13:800:7781:9726:396b:44dd:3ae1, length 88
18:42:28.032193 IP6 2a02:XXXX:c0:5cf0::1 > 2a02:XXXX:c0:5cf0:d1fb:81de:caac:2c69: ICMP6, destination unreachable, unreachable route 2600:1f13:800:7782:4d97:1072:46c:e309, length 88
18:42:28.139635 IP6 2a02:XXXX:c0:5cf0:bf1c:ad79:613a:1017 > 2a00:1450:4005:801::2003: ICMP6, echo request, id 1, seq 10905, length 40
18:42:28.139848 IP6 2a02:XXXX:c0:5cf0::1 > 2a02:XXXX:c0:5cf0:bf1c:ad79:613a:1017: ICMP6, destination unreachable, unreachable route 2a00:1450:4005:801::2003, length 88
18:42:28.269298 IP6 2a02:XXXX:c0:5cf0::1 > 2a02:XXXX:c0:5cf0:d1fb:81de:caac:2c69: ICMP6, destination unreachable, unreachable route 2600:1f13:800:7780:f34e:2fd8:b49f:b9ec, length 88
18:42:28.675746 IP6 2a02:XXXX:c0:5cf0::1 > 2a02:XXXX:c0:5cf0:d1fb:81de:caac:2c69: ICMP6, destination unreachable, unreachable route 2a00:1450:4005:802::2002, length 88

Any Idea what I can check?

Found the problem by myself - I installed the mwan3 package for investigation.... :man_facepalming:t3:

After I removed it, the whole thing worked again.... :relieved:

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