I have a cisco 877 that's been working fine (after an RMA on the first one I had due to overheating issues) and thought I'd like to re-enable ipv6, since the router supports it.
The configuration seems simple enough - the tunnel broker (btexact - the only one left in the UK AFAIK) provides a script to configure IOS. However although everything looks like it has worked, I cannot ping any ipv6 addresses on the other end of the tunnel.
Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 2001:200:0:8002:203:47FF:FEA5:3085, timeout is 2 seconds: ..... Success rate is 0 percent (0/5)
A debug log (debug ip tunnel/debug ip packet) shows the packets going out, but nothing is coming back at all..050632: Dec 7 15:37:53.530: Tunnel0: IPv6/IP encapsulated 188.8.131.52->184.108.40.206 (linktype=79, len=120) 050633: Dec 7 15:37:53.530: IP: s=220.127.116.11 (Tunnel0), d=18.104.22.168 (Dialer0), len 120, sending, proto=41 050646: Dec 7 15:40:20.167: Tunnel0: IPv6/IP encapsulated 22.214.171.124->126.96.36.199 (linktype=79, len=123) 050647: Dec 7 15:40:20.167: IP: s=188.8.131.52 (Tunnel0), d=184.108.40.206 (Dialer0), len 123, sending, proto=41
At this point I'm stumped - short of asking to ISP to see if the packets are actually leaving the cisco (which would be a major pain - they don't 'support' anything but Windows and getting them to understand such a request is not something I'm really keen to do).
Of course it's possible the tunnel broker is dead (it worked 2 years ago when I last dabbled in ipv6, but a lot can happen in that time).. I'd have to find another one then but they're getting scarce - all I can find are dead links... any ideas for live ones? (preferably in europe but if there are none there I'd settle for a US one).
(relevant bits of running config) interface Tunnel0 description BTexact Technologies tunnel broker (tb.ipv6.btexact.com) no ip address no ip redirects no ip unreachables no ip proxy-arp ip route-cache flow ipv6 address 2001:618:400::549:DF28/128 ipv6 enable ipv6 mtu 1280 tunnel source Dialer0 tunnel destination 220.127.116.11 tunnel mode ipv6ip end
interface Vlan1 description $FW_INSIDE$ ip address 192.168.44.1 255.255.255.0 ip access-group 100 in no ip redirects no ip unreachables no ip proxy-arp ip nat inside ip virtual-reassembly ip route-cache flow ip tcp adjust-mss 1452 ipv6 address 2001:618:400:2EEA::/64 eui-64 ipv6 enable ipv6 mtu 1280 end