I was thinking similarly with a possibly faulty cable pegging the speeds to Fast Ethernet, much as as faulty GigE port on either the ONT or the Netgear router - but then I thought 80 Mbps is a very coincidental speed to be pegged to for a hardware fault…usually if the port is flapping or faulty the speed will be close to the limit of Fast Ethernet ie 94-ish Mbps

In reply to a post by candlerb:

Except the problem so far is only reported with the third-party router, and putting the Sky router in place has fixed it. (Aside: OP should make sure they don't touch the ONT in future when doing that).

And of course, Sky will say it's the third-party router which is at fault. Which it certainly could be.

The issue has occurred with my 3rd party router, rebooting it didn't help, rebooting the ONT did.

Yes I strongly suspect Sky will tell me to go away without their router attached.

I would use it, but you can't even port forward to a different internal port...


edit: forgot to mention Sky don't use PPPoE, its IPoE

Edited by starfire (Thu 10-Feb-22 10:59:20)

I have to reboot our TTB router about once a month, one time after several reboots and not getting any better speeds I rebooted the ONT, although at time this restored the speed since then a router reboot has solved the problem, so might have been just chance.

I don't disagree that Sky will blame the third party router as you would expect them to do, as so many things have been rebooted its hard to tell exactly but I agree maybe next time first reboot third party router to see if that resolves it then switch with sky router and see if that fixes it.

Sky and no PPPoE.

Doesn't work that way with PPPoE - sessions are steered to a BRAS usually via RADIUS, not a race. The link is point to point, not broadcast.

Thanks for the correction.

I'd guess: the session is being delivered as a VLAN to some sort of routing device, which might be applying an IP profile dynamically as part of session setup, e.g. DHCP -> RADIUS, and they may have a screw-up here where it's wrongly applying an 80M profile sometimes.

These problems are annoying when they are not consistently repeatable

In reply to a post by dect:

I do think "never going above 80Mb/s" and a reboot of the ONT fixing it is significant.

I am talking purely from a layman's point of view so I would give Sky a call and make it their problem to fix it if it reoccurs.

Yes sir.

Folks are working to the assumption that the Sky router is golden here - but the OP hasn’t clarified if the Sky router has previously been in situ for a long-ish enough period (several weeks) as the Netgear router has when it experienced the issue.

So the problem may well be inherent even with the Sky router in place…

It might be helpful to set up a BQM via Thinkbroad if you can. This may give some extra information when speeds drop to what is happening, i.e. does it look like congestion?

Doesn't do any harm, but I would think it's unlikely if it's flatlining at 80M.

In reply to a post by Pheasant:

Yes sir.

Folks are working to the assumption that the Sky router is golden here - but the OP hasn’t clarified if the Sky router has previously been in situ for a long-ish enough period (several weeks) as the Netgear router has when it experienced the issue.

So the problem may well be inherent even with the Sky router in place…

Sky router has never been in place for more than 2 days at the start of service.