cancel
Showing results for 
Show  only  | Search instead for 
Did you mean: 
simongarrett
Aspiring Contributor
1,096 Views
Message 1 of 4

Suddenly, can't connect IPv6. Router gets no response to IPv6CP Configure-Request

I used to be able to use IPv6 on BT Internet using an Asus DSL-AC56U until a week or two ago.  Since then the router won't connect, getting no response to IPV6CP Configure-Request messages and timing out. I have not changed any router (or PC) settings. 

Anyone have any ideas about whether this can be a configuration issue at my end, or whether it's a network issue?  I suspect the latter, as I've changed everything my end, including a factory reset and manual reconfiguration of the router, which has latest firmware (but which hasn't changed recently).

I've tried talking to BT, but get messages like "we don't know about IPv6 - it's beyond my pay grade".

The irritating thing is it used to work.  Sites like ipv6-test.com and test-ipv6.com reported IPv6 fully working.  But now native won't work, so I get long waits on sites that try IPv6 first, and test sites report IPv6 only by Teredo tunnelling. 

Here's the relevant part of the router log when it brings up PPP, IPv4 then a 17 second delay while it tries and fails on an IPv6VP Configure-Request. 

2018-03-22 18:05:27 syslog: Using interface ppp0
2018-03-22 18:05:27 syslog: Connect: ppp0 <--> 0.38
2018-03-22 18:05:27 syslog: CHAP authentication succeeded: CHAP authentication success
2018-03-22 18:05:27 syslog: CHAP authentication success
2018-03-22 18:05:27 syslog: CHAP authentication succeeded
2018-03-22 18:05:27 dnsmasq[3244]: reading /etc/resolv.conf
2018-03-22 18:05:27 dnsmasq[3244]: using nameserver 81.139.56.100#53
2018-03-22 18:05:27 dnsmasq[3244]: using nameserver 81.139.57.100#53
2018-03-22 18:05:27 dnsmasq[3244]: ignoring nameserver 127.0.0.1 - local interface
2018-03-22 18:05:27 syslog: local  IP address 86.147.169.157
2018-03-22 18:05:27 syslog: remote IP address 172.16.15.59
2018-03-22 18:05:27 syslog: primary   DNS address 81.139.57.100
2018-03-22 18:05:27 syslog: secondary DNS address 81.139.56.100
2018-03-22 18:05:28 WEB: Configuration changed: Wan_PVC
2018-03-22 18:05:29 kernel: Link State: PVC_0 logistic interface up.
2018-03-22 18:05:30 dnsmasq[3244]: exiting on receipt of SIGTERM
2018-03-22 18:05:30 dnsmasq[5973]: started, version 2.78 cachesize 150
2018-03-22 18:05:30 dnsmasq[5973]: using nameserver 81.139.56.100#53
2018-03-22 18:05:30 dnsmasq[5973]: using nameserver 81.139.57.100#53
2018-03-22 18:05:30 dnsmasq[5973]: reading /etc/resolv.conf
2018-03-22 18:05:30 dnsmasq[5973]: using nameserver 81.139.56.100#53
2018-03-22 18:05:30 dnsmasq[5973]: using nameserver 81.139.57.100#53
2018-03-22 18:05:30 dnsmasq[5973]: ignoring nameserver 127.0.0.1 - local interface
2018-03-22 18:05:30 dnsmasq[5973]: bad address at /etc/hosts line 2
2018-03-22 18:05:30 dnsmasq[5973]: read /etc/hosts - 5 addresses
2018-03-22 18:05:32 kernel: [qos_execute(8718)]:Force Turn Off Bandwidth Limiter on Guest Network.
2018-03-22 18:05:33 WAN Connection: WAN was restored.
2018-03-22 18:05:33 start_nat_rules: apply the nat_rules(/tmp/nat_rules)!
2018-03-22 18:05:38 kernel:
2018-03-22 18:05:38 kernel:  #### wan_primary: [86.147.169.157]
2018-03-22 18:05:39 kernel: ddns_execute(), DDNS is not enable, so remove /etc/ddns.conf.
2018-03-22 18:05:40 kernel: clock_sync: TCAPI_COMMIT Timezone
2018-03-22 18:05:57 syslog: IPV6CP: timeout sending Config-Requests

Any pointers to where the problem might lie much appreciated.

(I've tried my Home Hub 4, but IPv6 is disabled on it with no user way of enabling it, and no firmware update from BT to enable it.)

0 Ratings
3 REPLIES 3
simongarrett
Aspiring Contributor
1,066 Views
Message 2 of 4

Re: Suddenly, can't connect IPv6. Router gets no response to IPv6CP Configure-Request

Well, that's another few hours of my life I won't see again on various BT phone numbers, and most of the fault people haven't even heard of IPv6, and the Tech Experts (0800 032 1118) say that if an IPv4 connection can be established, they won't even log a fault about IPv6.

Do BT actually support IPv6?  Can anyone point to any press release offering IPv6 as a service?

0 Ratings
ePatryk
Aspiring Contributor
931 Views
Message 3 of 4

Re: Suddenly, can't connect IPv6. Router gets no response to IPv6CP Configure-Request

Hey Simon,

I have the same problem after upgrading to a new contract. Did you have the problem fixed already?
0 Ratings
simongarrett
Aspiring Contributor
923 Views
Message 4 of 4

Re: Suddenly, can't connect IPv6. Router gets no response to IPv6CP Configure-Request

It just "went away" after a couple of weeks.  I suspect some network configuration fault. 

0 Ratings