topic Re: Unstable prefix delegation in IPv6 Trial

Unstable prefix delegation

MJN — Thu, 01 May 2014 07:22:58 GMT

Hi PN,
I've noticed over the past week or so that my assigned prefix keeps changing. It appears to be toggling between only two /56's but even so it plays havoc with the static address assignments I've got. Whilst I could automate the changes for some of them (although this would be a bit of hack) there are other devices that can only feasibly be changed manually.
I appreciate we are still in a trial phase and so disruption is to be entirely expected but I do hope our assignments would be more stable under the final deployment.
Mathew

Re: Unstable prefix delegation

chrcoluk — Thu, 01 May 2014 07:39:16 GMT

the ipv6 on your router is changing?

Re: Unstable prefix delegation

MJN — Thu, 01 May 2014 07:47:04 GMT

Yes - the /56 prefix.

Re: Unstable prefix delegation

chrcoluk — Thu, 01 May 2014 07:50:57 GMT

not happening here.

Re: Unstable prefix delegation

bobpullen — Thu, 01 May 2014 09:04:19 GMT

Not noticed here either (I'm assuming my IPv6 Think Broadband ping monitor would die if the prefix had changed?)
Although the connection has been up for over a month so I doubt there's been much opportunity for it to change. Might try a few PPP disconnects/reconnects when I next get the chance and see what happens.

Re: Unstable prefix delegation

AndyH — Thu, 01 May 2014 09:17:13 GMT

Is there a lease on the /56 prefix addresses or are they static?

Re: Unstable prefix delegation

bobpullen — Thu, 01 May 2014 09:34:31 GMT

I believe they're supposed to be static.

Re: Unstable prefix delegation

DougMa — Thu, 01 May 2014 10:27:48 GMT

Mine has changed once, a few weeks ago, I noticed because I had to update a bunch of AAAA records and firewall rules. I figured that it was likely a side effect of changes made during the trial and so didn't worry too much.
Doug

Re: Unstable prefix delegation

dave — Thu, 01 May 2014 15:12:41 GMT

Does it change when you connect to either PTW-BNG01 or PTN-BNG01 only? If it's always one of these 2 I might know why.

Re: Unstable prefix delegation

jelv — Thu, 01 May 2014 15:18:53 GMT

Before I spend time trying to hit one of those gateways, does IPSC go through them?

Re: Unstable prefix delegation

MJN — Thu, 01 May 2014 19:21:40 GMT

Quote from: dave
Does it change when you connect to either PTW-BNG01 or PTN-BNG01 only? If it's always one of these 2 I might know why.

To be honest I'm not sure - how do I check?
I can certainly confirm that it appears to have only been following loss of connectivity below Layer 2, something which has happened quite a few times recently. The new prefix has been assigned post-reconnection.

Re: Unstable prefix delegation

AndyH — Thu, 01 May 2014 20:08:07 GMT

http://usertools.plus.net/@gateway/ or do a traceroute and look at your second hop.

Re: Unstable prefix delegation

MJN — Thu, 01 May 2014 21:23:22 GMT

Thanks Andy. I'm on pcl-ag07 currently (and with my 'usual' prefix) and so will see what gateway I'm on if it changes again.

Re: Unstable prefix delegation

MJN — Fri, 02 May 2014 21:22:16 GMT

Quote from: dave
Does it change when you connect to either PTW-BNG01 or PTN-BNG01 only? If it's always one of these 2 I might know why.

I've just had a forced reconnection and ended up with a new prefix. I am indeed now on PTN-BNG01...

Re: Unstable prefix delegation

MJN — Sat, 03 May 2014 10:53:50 GMT

Am now on PCL-AG03 and back to my 'normal' prefix.
Perhaps I ought to raise a fault as the disconnections are annoying in their own right regardless of the effect they're having on the prefix!

Re: Unstable prefix delegation

paulmh5 — Sat, 03 May 2014 15:47:32 GMT

If you are getting so many drops then yeah you may have a fault. In terms of the v6 prefix I'll have a chat with people on Tuesday, looks like an issue with the new BNGs/Radius.

Re: Unstable prefix delegation

AndyH — Tue, 06 May 2014 08:36:41 GMT

Just to confirm - I also had a new v6 prefix when on the BNGs.

Re: Unstable prefix delegation

paulmh5 — Tue, 06 May 2014 09:15:07 GMT

Hi
I expect everyone on the trial will have. We'll add it to the list to look at.

Re: Unstable prefix delegation

paulmh5 — Tue, 06 May 2014 19:15:53 GMT

I think we've found the issue. Anyone on the trial with a static v6 address will have the same problem if you hit one of the BNGs.
If its an issue for you please just disconnect and reconnect onto an AG. We'll get it fixed but it may take a week or two depending when we can fit it in.

Re: Unstable prefix delegation

paulmh5 — Tue, 10 Jun 2014 06:26:53 GMT

Just so you know we haven't forgotten about this, its being worked on but its a bigger bit of work than we first thought so may take a little longer to fix.