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[Chrysalis]

Does anything special need to be done, I recall the way to get this working on VDSL that you had to boost the MTU on the DSL modem device, is a typical ONT accessible and configurable in this way or is it just able to work out of the box?

[doofus]

It works out of the box. Just set your router MTU to 1500 

[Chrysalis]

Thank you.

[dee.jay]

Haven't thought to try this myself yet.

What kind of gains did you see, doofus?

[Dwight]

I actually did a post about this for my ONT, and got shouted down for it.
But there are a number of videos on YouTube about pinging google to confirm the best MTU size for your line. and then setting that.
Regards.
Dwight

[doofus]

There are no 'real' gains. It just uses the standard 1500 mtu like everyting else does on my home ethernet network 
I suppose there wil be a small percentage throughput gain - not that you would notice.
But if you like to fiddle and tweak, get 1500 mtu 

[dee.jay]

Of course I do, I wouldn't be a Network Engineer otherwise

[Chrysalis]

I was getting packet loss again when maxing the line, and my initial fast.com was 870, and 870 repeated.

Earlier by enabling baby jumbo frames, thats up to 940 now, and the packet loss is almost all gone similar to VM.

As was said, seems ONT handles it out of the box.

[doofus]

Yeah AAISP do mention MTU for cityfibre here:
https://www.aa.net.uk/broadband/home1-cityfibre-services/

[Alex Atkin UK]

Yeah AAISP do mention MTU for cityfibre here:
https://www.aa.net.uk/broadband/home1-cityfibre-services/

Gotta love that "committed rate", not much of a commitment to deliver 70/35 on a 1000/1000 connection. That's taking covering your rear a little bit far IMO.

I could understand that on an ISP that sells the service dirt cheap, but at AAISP prices that's not at all appealing.

How many customers do they split onto a single PON for that to ever be likely to happen?

[Chrysalis]

Those are CF commit rates Alex.

For whatever reason OR set their's much higher.

However from where I sit I think if anything OR will be more likely to get visible downstream contention as CF are in the midst of rolling out XGS-PON, and OR have the higher take up.  (although before that XGS-PON is done, CF for sure more likely on the upstream).

[doofus]

All the AAISP FTTP minimum rates are here:

https://www.aa.net.uk/broadband/fttp-speeds/

[Alex Atkin UK]

Those are CF commit rates Alex.

For whatever reason OR set their's much higher.

However from where I sit I think if anything OR will be more likely to get visible contention as CF are in the midst of rolling out XGS-PON, and OR have the higher takeup.

I assumed they were, they just seem excessively low even for GPON and doubly so that it would be the same for a top-tier ISP vs something more budget friendly.

As for visible contention, its going to be very interesting once I can get OR fastest service to see how peak hours compare to off peak.  Although I have no idea if anyone else is on my PON or not.  Also very odd a symmetrical service has an asymmetrical minimum.

I'll still move to CF in a heartbeat if they ever get round to coming here.  Still in plan but there's barely any roadworks showing up for them any more and it seems no closer than 2 years ago.

[j0hn]

Does anything special need to be done, I recall the way to get this working on VDSL that you had to boost the MTU on the DSL modem device, is a typical ONT accessible and configurable in this way or is it just able to work out of the box?

Every Openreach ONT supports this without modification.

I actually did a post about this for my ONT, and got shouted down for it.
But there are a number of videos on YouTube about pinging google to confirm the best MTU size for your line. and then setting that.
Regards.
Dwight

This post? Hardly shouted down😂

[doofus]

This gives a nice gentle introduction to MTU and fiddling with it:

https://homenetworkgeek.com/mtu-size/