topic Re: Disable ipv4 address sharing (map-t) in Broadband

Disable ipv4 address sharing (map-t)

domb84 — Fri, 02 Aug 2024 18:51:54 GMT

So sky have forced map-t on its users meaning that most 3rd party routers are now paperweights. This article suggests that customers can request its disabled. I've requested this twice and support have no idea what im requesting. How can i get this disabled?

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

"UPDATE 14th June 2024 @ 7am

Sky UK has kindly responded to confirm the information we’ve posted above and that their solution will be able to proactively opt-out customers from IPv4-sharing where it will hinder their user experience, so customers should not be impacted by these changes."

Re: Disable ipv4 address sharing (map-t)

Chrisee — Fri, 02 Aug 2024 20:05:27 GMT

@domb84there is no indication that users of third party routers will be negatively impacted. If the router supports MAP-T as many do then it can be involved. If it doesnt support MAP-T as the black Sky hub 4 doesn't then it remains on the standard set up.

Sky customer services are not directly involved in the roll out which in the main is transparent to users the only observable issues are with some VPN users with the new white Sky Max hubs which can be sorted by switching the ratio from 8:1 to 1;1.

Re: Disable ipv4 address sharing (map-t)

domb84 — Fri, 02 Aug 2024 20:23:06 GMT

Unifi do not support map-t. Using the unifi i'll get an ipv4 address after anywhere between 1-24 hours, then it will randomly lose it anywhere from 2-4 days later leaving me with no internet access. I never receive an ipv6 address during that period either. The only solution is to use the sky hub ive found. Even this if you choose to configure your own internal subnet rather than use 192.168.0.0/24, the hub sets itself back to 192.168.0.1 after a few days regardless.

Re: Disable ipv4 address sharing (map-t)

-rpnz- — Sat, 03 Aug 2024 07:29:44 GMT

@domb84 wrote:
So sky have forced map-t on its users meaning that most 3rd party routers are now paperweights.

Hi @domb84

MAP-T isn't being forced, MAP-T will only be given to CPE routers that ask for it.

However, Ubiquiti's Unifi routers do have a known issue, where they ask for MAP-T but don't actually support it.

@domb84 wrote:
Unifi do not support map-t. Using the unifi i'll get an ipv4 address after anywhere between 1-24 hours, then it will randomly lose it anywhere from 2-4 days later leaving me with no internet access. I never receive an ipv6 address during that period either.

These symptoms, however, sound a bit different to what I'd expect, and there may be additional or just other issues going on here. If you were hitting the Unifi/MAP-T issue, you would have a DHCPv6 PD lease (IPv6 prefix), and you would have a DHCPv4 lease with an unusable IPv4 address from the 100.64.0.0/10 prefix. The quick fix here would be to disable DHCPv6 PD on the Unifi's WAN interface and fall back to single-stack IPv4-only; the longer-term proper fix would be for Unifi to either not ask for MAP-T, or to start supporting MAP-T.

Re: Disable ipv4 address sharing (map-t)

domb84 — Sat, 03 Aug 2024 07:43:41 GMT

Thanks for the information. This is exactly what happens. It falls back to a 100.64.0.0/10 address.

If i set ipv4 only and disable ipv6 it works for a few days but then its as though the lease expires and connectivity is lost for hours. Once for 2 days. Then all of a sudden I'll receive a new v4 lease and all is well again.

Something is very odd...

is there some detailed documentation on interface configuration?

Re: Disable ipv4 address sharing (map-t)

domb84 — Sat, 03 Aug 2024 07:45:56 GMT

FYI although the unifi reports a 10.64.0.0 address, at no point has it reported getting a v6 address. I configured for a /56 delegated prefix.

Re: Disable ipv4 address sharing (map-t)

TimmyBGood — Sat, 03 Aug 2024 08:36:01 GMT

@domb84 wrote:

This article suggests that customers can request its disabled. I've requested this twice and support have no idea what im requesting. How can i get this disabled?

"UPDATE 14th June 2024 @ 7am

Sky UK has kindly responded to confirm the information we’ve posted above and that their solution will be able to proactively opt-out customers from IPv4-sharing where it will hinder their user experience, so customers should not be impacted by these changes."

Actually that quote is saying the system automatically opts-out customers under certain circumstances where these are detected, and your use of a non-Sky router probably prevents that happening.

You'll need to persist with contacting someone in support who's aware of the situation. I'll try escalating your original post.

Re: Disable ipv4 address sharing (map-t)

-rpnz- — Sat, 03 Aug 2024 09:08:37 GMT

@domb84 wrote:
If i set ipv4 only and disable ipv6 it works for a few days but then its as though the lease expires and connectivity is lost for hours. Once for 2 days. Then all of a sudden I'll receive a new v4 lease and all is well again.

Sounds like you're missing DHCPv4 Option 61, which allows us to authenticate your service using DHCPv4, and instead are relying on DHCPv6 (which then has the MAP-T issue). Have a browse of the forums for other threads discussing 3rd party routers.

Edit: Sorry I missed the last bit where you said "and then all is well again", in which case it's just the switchover. If you leave DHCPv6 disabled, you will not get MAP-T again and should not have anymore issues. (of course the down side is you no longer have IPv6 connectivity)

Re: Disable ipv4 address sharing (map-t)

Lisa-P1987 — Sat, 03 Aug 2024 09:59:48 GMT

Thanks for escalating this. We’ve sent domb84 an invite to chat.

Re: Disable ipv4 address sharing (map-t)

domb84 — Sat, 03 Aug 2024 11:17:46 GMT

I should say its all well for another couple of days or until the router is rebooter, physically disconnected and then it all starts again. I tried various combinations of option 61 and trying to guess your auth mechanism. It didnt seem to matter if it was encoded, clear text, various combinations of enaill address options. The only difference seemed to be that your connectivty checker seems to think its ok if I specify it (yet i have no public ip so not sure how that works), and without it seems to think ive unplugged my router. Will follow up on the dm. Thank you!

Re: Disable ipv4 address sharing (map-t)

Earnys10 — Sat, 03 Aug 2024 13:00:37 GMT

So they've now basically opened doors to attack vectors.

This is such a bad security vulnerability just to save a few pounds. I was completely unaware about these changes.

Re: Disable ipv4 address sharing (map-t)

TimmyBGood — Sat, 03 Aug 2024 13:31:10 GMT

@Earnys10 wrote:

This is such a bad security vulnerability just to save a few pounds.

IPv4 simply doesn't have enough addresses for global use over the rest of this century: its inventors couldn't realistically have anticipated the need in the early 1980s.

IPv6 has to happen.

Re: Disable ipv4 address sharing (map-t)

Ash_scfc — Tue, 03 Sep 2024 15:30:49 GMT

Hello, i have spent the last 2 days with connectivity issues on my work supplied laptop.

Its gone high up to our network tech people (i work for one the worlds biggest insurance brokers) and they've tracked it down to MAP-T being enabled on my Sky Max Hub.

How do i opt out of this, i have not been able work for 2days now?

Re: Disable ipv4 address sharing (map-t)

TimmyBGood — Tue, 03 Sep 2024 16:40:49 GMT

@Ash_scfc

That requires individual attention, so I'll escalate your post.

Re: Disable ipv4 address sharing (map-t)

Addie15 — Tue, 03 Sep 2024 16:46:51 GMT

Hi there! Thank you for escalating this. We have sent an invite to @Ash_scfc.

Re: Disable ipv4 address sharing (map-t)

MotherEvans — Tue, 17 Sep 2024 18:38:42 GMT

Hi,

I have recently migrated to yourselves - Friday the 13th.. Similarly to the other users in this post, i have had issues connectign to my work VPN. Initially the VPN to my work worked, however it suddenly stopped working over night and I haven't been able to connect yesterday or today. Tethering through my iPhone works, and another mobile device.

Please can I be opted out of this please as this isn't allowing me to connect to my work VPN.

Thanks.

Re: Disable ipv4 address sharing (map-t)

CCatt — Sun, 29 Sep 2024 13:17:38 GMT

Hi,

I've been facing issues relating to MAP-T, and SKY support on the phone tell me they don't know anything about it and can not help. Cany anyone point me in the right direction of who to speak to.

Re: Disable ipv4 address sharing (map-t)

NigelB1969 — Wed, 02 Oct 2024 20:47:27 GMT

Hi, my wife is really struggling with this issue and could really do with someone from Sky who knows the problem and how to resolve, she has spoken to a few IT folks at Sky that either go thru basic steps or promise here a call back that never materialise. She works for a large international bank and her IT dept although understanding seems to be at a bit of a loss and are asking me to change settings on the Wi-Fi Max router which i am a little reluctant to do as i am concerned it will knock out my own connection to which i have no current issues. Any help greatly appreciated

Re: Disable ipv4 address sharing (map-t)

Chrisee — Thu, 03 Oct 2024 06:21:38 GMT

@NigelB1969 can you ask your wife to complete and submit this form https://forms.office.com/e/kk1gCkWsRb?origin=lprLink which is to gather information for the team investigating the issue.

Enabling UPnP will change the MAP-T sharing ratio from 8:1 to 1:1 which may sort your wife's issue and shouldn't upset yours. If it does it can be reversed. This post of mine explains the steps UPnP set up

Re: Disable ipv4 address sharing (map-t)

Zer0 — Tue, 08 Oct 2024 08:27:11 GMT

Can I please get an escolation as my UDM is now borked with MAP-T and a private ipv4 allocation being given by DHCP.