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IPv6 with RT-AC68U

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cimnine

New Around Here
[solved] IPv6 with RT-AC68U

Solved in terms of 'not related to the router'.

Hi

Today I set up my RT-AC68U for IPv6. (For the record, it's on FW 3.0.0.4.376_3626 .)

My ISP does support native IPv6 and assigns /48 subnets through DHCPv6-PD.

It is possible to ping6 within the network (using the 2a02:XXXX:4a06:: and the fe80:: addresses), but it's not possible to ping6 any external service (e.g. google.com) from any of the clients in the network except from the router itself (i.e. ssh into the router and ping6 google.com works perfectly.)

This is the (anonymized) config:

Code:
          IPv6 Connection Type: Native with DHCP-PD
              WAN IPv6 Address: 2a02:XXXX:2000:5:6a5b:35ff:fe94:e37a/64
              WAN IPv6 Gateway: fe80::224:14ff:feef:72ff
              LAN IPv6 Address: 2a02:XXXX:4a06:0:3a2c:4aff:fe49:d860/48
   LAN IPv6 Link-Local Address: fe80::3a2c:4aff:fe49:d860/64
                       DHCP-PD: Enabled
               LAN IPv6 Prefix: 2a02:XXXX:4a06::/48
                   DNS Address:

Every client receives it's own /64 subnet out of the 2a02:XXXX:4a06:: subnet though SLAAC as it should.

To me it looks strange that the WAN IPv6 is out of a completely different subnet than the LAN IPv6 prefix, but the 2a02:XXXX:4a06::/48 net is routed back to that WAN IPv6, so it might actually be okay. (I've checked that with a tracepath6 from an external server.) Actually I'm not so sure about that second part anymore. I need to check that with my ISP first.

Does anyone has an idea why it's not working or has anyone at least fully working native IPv6? What are your settings?

Cheers,
Chris

PS: Here is the routers IPv6 routing table, maybe this could lead to the issue. (I'm helpless here :( )
Code:
IPv6 routing table
Destination                                 Next Hop                                Flags Metric Ref    Use Iface
2a02:XXXX:2000:5::/64                        ::                                      UA    256    77       0 eth0    
2a02:XXXX:4a06::/48                          ::                                      U     256    0        0 br0     
fe80::3a2c:4aff:fe49:d860/128               ::                                      U     256    0        0 vlan2   
fe80::/64                                   ::                                      U     256    0        0 eth1    
fe80::/64                                   ::                                      U     256    0        0 eth2    
fe80::/64                                   ::                                      U     256    0        0 br0     
fe80::/64                                   ::                                      U     256    0        0 vlan2   
fe80::/64                                   ::                                      U     256    0        0 eth0    
fe80::/64                                   ::                                      U     256    0        0 vlan1   
::/0                                        fe80::224:14ff:feef:72ff                UGDA  1024   3257       0 eth0    
::1/128                                     ::                                      U     0      0        1 lo      
2a02:XXXX:2000:5:6a5b:35ff:fe94:e37a/128     ::                                      U     0      47       1 lo      
2a02:XXXX:4a06::/128                         ::                                      U     0      0        1 lo      
2a02:XXXX:4a06:0:3a2c:4aff:fe49:d860/128     ::                                      U     0      554       1 lo      
fe80::/128                                  ::                                      U     0      0        1 lo      
fe80::/128                                  ::                                      U     0      0        1 lo      
fe80::/128                                  ::                                      U     0      0        1 lo      
fe80::/128                                  ::                                      U     0      0        1 lo      
fe80::3a2c:4aff:fe49:d860/128               ::                                      U     0      0        1 lo      
fe80::3a2c:4aff:fe49:d860/128               ::                                      U     0      0        1 lo      
fe80::3a2c:4aff:fe49:d860/128               ::                                      U     0      810       1 lo      
fe80::3a2c:4aff:fe49:d860/128               ::                                      U     0      0        1 lo      
fe80::3a2c:4aff:fe49:d864/128               ::                                      U     0      0        1 lo      
fe80::6a5b:35ff:fe94:e37a/128               ::                                      U     0      457       1 lo      
ff02::1/128                                 ff02::1                                 UC    0      2189       0 br0     
ff02::1/128                                 ff02::1                                 UC    0      1        0 eth0    
ff00::/8                                    ::                                      U     256    0        0 eth1    
ff00::/8                                    ::                                      U     256    0        0 eth2    
ff00::/8                                    ::                                      U     256    0        0 br0     
ff00::/8                                    ::                                      U     256    0        0 vlan2   
ff00::/8                                    ::                                      U     256    0        0 eth0    
ff00::/8                                    ::                                      U     256    0        0 vlan1
 
Last edited:
I've confirmed it's a routing problem. Using tcpdump I have seen that my remote server received the ICMPv6 packages, but failed with a "destination unreachable" when delivering the answer.
 

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