topic Re: Dynamic of fixed? in Everything else

Dynamic of fixed?

Anonymous — Thu, 03 Apr 2025 21:41:45 GMT

I've never had a fixed IP. But despite taking down the ONT for 5 minutes, 10 minutes and even overnight (around 8 hours) I'm still getting the same IP.

Before anyone asks - the Hub2 remained up. I've never had to reboot the Hub2 to get a new IP allocation in the past.

Re: Dynamic of fixed?

Marksfish — Fri, 04 Apr 2025 06:26:42 GMT

Despite it being said on here that the dynamic ip's are sticky, I have never had the same ip address when I make a re- connection on Plusnet. On Sky, I had the same sticky ip for 18 months.

Mark

Re: Dynamic of fixed?

Gandalf — Fri, 04 Apr 2025 08:15:09 GMT

@Anonymous I can see you have a dynamic IP. It changed on the 26th, 28th, 31st and the 1st.

Re: Dynamic of fixed?

Townman — Fri, 04 Apr 2025 10:29:31 GMT

@Marksfish

The degree of stickiness is dependent on the local pool of IP addresses and the population using it. If you are in a sizable conurbation there is every chance that the pool of IP addresses are being turned over quite fast / might have a shorter lease time.

In rural areas, with small populations the churn on IP addresses could be less and thus IP address will appear to be more sticky.

@Anonymous

You might not have needed to reboot the Hub Two to change the IP address, but will most certainly need to disconnect the PPP session by one means or another. The IP address is allocated on the establishment of the PPP session. A restart of the PPP session will follow...

Rebooting of the router
Loss and restoration of the xDSL session
BT Wholesale engineering works disconnecting PPP sessions
Manual disconnection of the PPP session

Without one of the above, there will be no change to the IP address.

Re: Dynamic of fixed?

Anonymous — Fri, 04 Apr 2025 21:55:33 GMT

I live in a rather large conurbation. It is 'city' size.

Dropping the ONT causes the cessation of the PPP. Would the log files from a Hub2 clear up anything? The logfile shows "PPP: Stopped PPP daemon(0,1,5)" as part of the powering down of the ONT. Which does suggest the PPP session was terminated (from one end, at least).

And being with an ONT I don't think xDSL is going to be a factor.

As I observed, I have never previosuly rebooted the 'router' to get a new IP. Therefore I must assume that powering down the ONT causes a cessation of the PPP session. (see above).

Anyways, the temporary hiatus of the past 3 days has now cleared. Without any changes here, Must've been something outside.

Re: Dynamic of fixed?

Anonymous — Fri, 04 Apr 2025 23:21:01 GMT

Or perhaps not.

Dynamic IP addresses appear to be rather more sticky than they have been in the past.

I was wondering whether the powering off of the ONT was perhaps interrupting coms at the LCP level, but a disconnection using the Hub2 interface indicates the LCP level (and PPP) is being rather cleanly shut down, What used to be a 5 minute wait for a new IP is now longer than 10 minutes. Something has definitely changed since 28th March (when things seemingly started getting more 'stickier' in the pool of dynamic addresses I 'live' within).