That's somewhat true.
Resyncing a line once won't have any negative impact on the DLM settings.

It can still negatively affect the line by having it off for long periods like overnight.

The DLM works out its average resync and average ES count based on the lines uptime.
If a line is allowed 8 resyncs or 500 ES in a 24 hour period (not actual DLM figures) then if a line is only synced for 6 hours it would only be allowed 2 resync and 125 ES in that time.

Only turning a modem on a few times a day when the broadband is required would give a much higher chance of the DLM taking action on a line to stabilise it.

"It can still negatively affect the line by having it off for long periods like overnight."

I can't recall that being mentioned on any forum previously.

In reply to a post by broadband66:

I can't recall that being mentioned on any forum previously.

That doesn't mean it isn't true.

As I said in my post the DLM uses MTBR/MTBE (mean time between errors/resyncs) when determining if a line needs intervention.

If you have a line that is very noisy during the day (very common on FTTC particularly with nearby industry) then the quiet/low errors at night lower the daily average errors.
The same goes for a line that loses sync a few times a day in the middle of the day.

Kitz wrote about MTBE/MTBR many years ago. The error/resync thresholds have changed since then but the exact same type of system still applies.

https://kitz.co.uk/adsl/DLM_system.htm#Element_Manag...

For many/most lines turning the modem off overnight will make no difference. For other lines it will.

In reply to a post by jabuzzard:

Back when dial up was a think then random dynamic IP addresses made sense. With the advent of ADSL and 24x7 connected routers it is somewhat pointless. It survives so that ISP can charge for static IP's and because they are lazy. It is similar to PPPoE still being used by the majority of UK ISP's for xDSL/FTTP connections instead of IPoE. They do it because they used to do it and are to bone idle and lazy to change.

As regards PlusNet my static IP is just fine, as is my mothers and sisters.

I dislike PPPoE as well but I think it makes wholesaling easier, and much of the UK BB market is done via wholesaling.

Not really. Openreach support both and don’t dictate to ISPs using their platform what authentication they should use. The two largest residential ISPs outside of BT - Sky and TalkTalk use IPoE without issue.

Tend to agree that PPoE is still used because ‘its there’ and it’s a known quantity, rather than making wholesaling any easier or for any other technically superior reasoning.

In reply to a post by Pheasant:

Tend to agree that PPoE is still used because ‘its there’ and it’s a known quantity

Yep, it made sense when Openreach were going around screwing VDSL2 modems to peoples' walls, but in the era of all-in-one VDSL2 routers being ubiquitous, not so much.

Edited by Oliver341 (Tue 16-Nov-21 13:07:10)

Didn't even make sense then. TalkTalk happily worked without VDSL without PPPoE with a separate Openreach supplied modem for example.

The continued use of PPPoE with VDSL and GPON based networks is just dumb. Ultimately it reduces your usable bandwidth, increases latency, and the ISP's have to spend many many thousands of pounds on equipment to terminate the PPPoE sessions rather than let the network switches they already have take the strain. As a consumer it is only a detriment.

You can say many things about TalkTalk and Sky as ISP's but there ditching of PPPoE shows that those designing the network are actually competent and know what they are doing.

In reply to a post by jabuzzard:

You can say many things about TalkTalk and Sky as ISP's but there ditching of PPPoE shows that those designing the network are actually competent and know what they are doing.

Mostly! When I was with TT on ADSL2+ they capped MTU at 1492 despite it being PPPoA which is capable of 1500.

In fact googling brings up an old post of mine which reminded me of their bizarre default router MTU of 1432:

https://forums.thinkbroadband.com/talktalk/t/4463342...

Openreach maybe but what about BT Wholesale, they have requirements about rate limits and the info been tacked on during BRAS authentication, which is part of a PPPoE setup.