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IPv6 on cellular connection on Cisco 1111


I'm trying to setup a cellular connection on my Cisco 1111 router.

The interface is UP and it gets a private IPv4 and a public IPv6 address.

If I try to send something on IPv4 through the cellular interface it works fine.

But there seems to be an issue with the IPv6.

I setup IPv6 routes (and a default route) but it doesn't seem to be working.


From various configuration guides I see the command ipv6 address autoconfig but it seems it is not supported here.

RTR(config-if)#ipv6 address autoconfig
IPv6 autoconfig is not supported on interface Cellular0/2/0!
Enabling IPv6 now!


But as I said I can see that the router gets an IPv6 address.

ATN-L3-RTR-21#sh ipv6 interface
Cellular0/2/0 is up, line protocol is up
IPv6 is enabled, link-local address is FE80::AAAA:6666:FFFF:580 (Note:sanitized)
No Virtual link-local address(es):
Global unicast address(es):
2001:XXXX:YYYY:ZZZZ:AAAA:B90A:FA05:4726, subnet is 2001:XXXX:YYYY:ZZZZ::/64 (Note:sanitized)
Joined group address(es):
MTU is 1500 bytes
ICMP error messages limited to one every 100 milliseconds
ICMP redirects are enabled
ICMP unreachables are sent
Output features: Dialer idle reset
ND DAD is enabled, number of DAD attempts: 1
ND reachable time is 30000 milliseconds (using 30000)
ND NS retransmit interval is 1000 milliseconds

Here is my config:

controller Cellular 0/2/0
lte modem link-recovery rssi onset-threshold -110
lte modem link-recovery monitor-timer 20
lte modem link-recovery wait-timer 10
lte modem link-recovery debounce-count 6
lte modem crash-action boot-and-hold

interface Cellular0/2/0
ip address negotiated
dialer in-band
dialer idle-timeout 0
dialer-group 1
ipv6 enable
pulse-time 1
ip virtual-reassembly

access-list 1 permit any
dialer-list 1 protocol ip permit
dialer-list 1 protocol ipv6 permit

ipv6 route 2600::/16 Cellular0/2/0
ipv6 route ::/0 Cellular0/2/0

When I try to ping for instance 2600:: it does not work.


Any idea what I'm doing wrong?


Thank you in advance!


Re: IPv6 on cellular connection on Cisco 1111

I managed to fix this.
In case someone bumps into this in the future the solution is to add the command ipv6 unicast-routing in global config.

After that IPv6 started to work and I was able to access external IPv6 addresses.

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