IPv6 seems still not work with all providers. My WAN interface ppp0 does not get an ipv6 address. Also no gateway is set. With the Router coming from the provider IPv6 is working without any problem.
Br0 interface and my LAN clients are getting an IPv6 global address. But because the router has no IP and gateway there is no IPv6 internet traffic.
admin@RT-AC68U-3570:/# ifconfig
br0 Link encap:Ethernet HWaddr 30:5A:3A:C6:35:70
inet addr:192.168.1.1 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::325a:3aff:fec6:3570/64 Scope:Link
inet6 addr: 2a02:a44e:XXXX::1/48 Scope:Global
UP BROADCAST RUNNING ALLMULTI MULTICAST MTU:1500 Metric:1
RX packets:2176 errors:0 dropped:0 overruns:0 frame:0
TX packets:2050 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:600964 (586.8 KiB) TX bytes:1132778 (1.0 MiB)
eth0 Link encap:Ethernet HWaddr 30:5A:3A:C6:35:70
inet6 addr: fe80::325a:3aff:fec6:3570/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:542731 errors:0 dropped:0 overruns:0 frame:0
TX packets:431744 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:738018951 (703.8 MiB) TX bytes:582869293 (555.8 MiB)
Interrupt:179 Base address:0x4000
eth1 Link encap:Ethernet HWaddr 30:5A:3A:C6:35:70
inet6 addr: fe80::325a:3aff:fec6:3570/64 Scope:Link
UP BROADCAST RUNNING ALLMULTI MULTICAST MTU:1500 Metric:1
RX packets:84 errors:0 dropped:0 overruns:0 frame:576
TX packets:741 errors:1 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:10034 (9.7 KiB) TX bytes:157588 (153.8 KiB)
Interrupt:163
eth2 Link encap:Ethernet HWaddr 30:5A:3A:C6:35:74
inet6 addr: fe80::325a:3aff:fec6:3574/64 Scope:Link
UP BROADCAST RUNNING ALLMULTI MULTICAST MTU:1500 Metric:1
RX packets:1316 errors:0 dropped:0 overruns:0 frame:612
TX packets:1967 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:268934 (262.6 KiB) TX bytes:1287750 (1.2 MiB)
Interrupt:169
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MULTICAST MTU:16436 Metric:1
RX packets:307 errors:0 dropped:0 overruns:0 frame:0
TX packets:307 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:33849 (33.0 KiB) TX bytes:33849 (33.0 KiB)
ppp0 Link encap point-to-Point Protocol
inet addr:81.207.xxx.xxx P-t-P:195.190.228.3 Mask:255.255.255.255
inet6 addr: fe80::488:6815:e5d9:c5da/10 Scope:Link
UP POINTOPOINT RUNNING MULTICAST MTU:1492 Metric:1
RX packets:202 errors:0 dropped:0 overruns:0 frame:0
TX packets:180 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:3
RX bytes:42470 (41.4 KiB) TX bytes:22508 (21.9 KiB)