Using My Own Router, Correct Way to Setup?

[Neo321]

Hi mate, just a query as I'm in a similar-ish situation. Not sure if you're using openwrt on the flint, but I'm running it on a zyxel router.
Initially I thought I had to insert some numbers and such to establish a conenction from the ONT modem, as thats all I found from some older threads on various forums. 
I was just setting up and plugged in my router and was about to set the 61 parameters but I saw it had got my wan connected!
I was surprised and so connected my laptop on lan port and surprisingly I had fiber internet working, no hoops to jump through.

Not sure if you have but I am having some issues though, lan ports which are connected will say "connected" but also that I have no internet. On my laptop it works. Connected to my TV, same " connected" but no internet. Although prime worked but not youtube.
Enabling wifi, same issue. Some devices connected but states theres no internet though still proivide internet. They have a explanation mark on the wifi symbol.
Google is saying something about ipv6 issues, sky uses it a lot. Any help or clues, thanks
It's really doing my head in and been at it last few days.

[Me134]

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@Neo321 wrote:

Hi mate, just a query as I'm in a similar-ish situation. Not sure if you're using openwrt on the flint, but I'm running it on a zyxel router.
Initially I thought I had to insert some numbers and such to establish a conenction from the ONT modem, as thats all I found from some older threads on various forums. 
I was just setting up and plugged in my router and was about to set the 61 parameters but I saw it had got my wan connected!
I was surprised and so connected my laptop on lan port and surprisingly I had fiber internet working, no hoops to jump through.

Not sure if you have but I am having some issues though, lan ports which are connected will say "connected" but also that I have no internet. On my laptop it works. Connected to my TV, same " connected" but no internet. Although prime worked but not youtube.
Enabling wifi, same issue. Some devices connected but states theres no internet though still proivide internet. They have a explanation mark on the wifi symbol.
Google is saying something about ipv6 issues, sky uses it a lot. Any help or clues, thanks
It's really doing my head in and been at it last few days.

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That may be the IPv6 prefix delegation size that others on here have struggled with, the default is 64 but Sky uses 56.

Look for "Request IPv6-prefix of length" in settings and change it from automatic or 64 to 56.

Don't forget to save the changes before rebooting all devices, let the router reboot fully first.

[noname123456]

Despite what some people on here claim, there is a lot of evidence to suggest Sky uses CG-NAT & MAP-T for their IPV4 & IPV6 connections.  

I have below explained in easy to understand terms what I mean by saying this: 'Sky uses CG-NAT & MAP-T for their IPV4 & IPV6 connections.' I will also no doubt come up against opposition on these forums, so it's best you do your own research but from what I have experienced and the symptoms associated with them, I have a sneaky suspicion I am/was using both CG-NAT & MAP-T.

CGNAT (Carrier-Grade Network Address Translation) is a system where your internet service provider (ISP) makes hundreds of different households share a single public internet address.

MAP-T (Mapping of Address and Port with Translation) is an IPv6 transition mechanism that allows multiple subscribers to share a single public IPv4 address across an IPv6-only internet provider network.

Basically unlike other providers such as BT, Sky is being cheap and this is why when we want to use our own routers, we come across obstacles like this. 

Now I contacted Sky Support and asked them about whether my connection was using IPV6 as approx 20% of their users infrastructure doesn't support it and in my case it didn't, so I completly disabled the IPV6 element on my router, just in case this was having a detrimental affect when Sky refreshed my IP for the IPV4 network, as I understand it, regardless if you use IPV6 or not, this takes priority over IPv4 when enabled, additionally IPV6 is renowened for being a buggy mess and tbh I'm glad to have it disabled. 

Until my IP refreshes in 50+ days I won't know wherther this has fixed my issue or not. I have also spoken with GL-iNET who are keen to find an answer for me by looking at my logs.

In terms of setting up youor account for Sky using DHCP 61, I followed these instructions: https://forum.gl-inet.com/t/sky-dsl-dhcp-61/46043/23

[TimmyBGood]

@noname123456 

Sky undoubtedly uses MAP-T on circuits with a Max Hub: that's been publicly documented in the UK for at least a couple of years.

https://www.ispreview.co.uk/index.php/2024/06/isp-sky-broadband-uk-deploying-ip-address-sharing-via-... 

I'm not aware of any confirmation that CGNAT is in use for broadband: that's typically for mobile data.

[TimmyBGood]

@noname123456 

For more technical detail than may be healthy, RIPE has a public copy of a presentation about the use of MAP-T by Sky Italia.

https://www.ripe.net/media/documents/Richard_Patterson_-_Sky_Italia_and_MAP-T_-_RIPE_Open_House_2021... 

[Chrisee]

@noname123456 while that presentation was correct for Sky Italia when it was made in 2021 the UK introduction of MAP-T made in 2024 has differences for example the ratio now being 8:1 as far as we have been told. 

It is not a case of Sky doing this to simply reduce costs it is down to the fact the supply of IP4 addresses is exhausted and the switch to IP6 has not happened as planned..

[Neo321]

Thanks. It wasw the first time I reached out to ai for assist.
After getting nowhere for a while following older guides about option 61 etc.
I was directed to factory reset and and would only need to insert the client id in hexadecimale format.
Shockingly this has worked! I'm very new to openwrt, it can be very complex tbh and feels very enterprise level.
My connection has been running fine since, though time will tell if I'm missing something.

In regards to OP's posts, lets see if I face that same issue. Hope not but it's sky, theres always something.