topic Re: DNS Issues with TalkTalk in Security

DNS Issues with TalkTalk

simmondp — Thu, 09 Jan 2025 08:30:46 GMT

Looks like there is a DNS problem (either a real one, or blocking going on) as:

d:\>nslookup radio.entertainmenttechnologies.co.uk 8.8.8.8
Server: dns.google
Address: 8.8.8.8

Non-authoritative answer:
Name: radio.entertainmenttechnologies.co.uk
Address: 79.99.41.130

But try this using the TalkTalk DNS Name Servers and you get this:

d:\>nslookup radio.entertainmenttechnologies.co.uk 79.79.79.80
Server: public-dns-b.as9105.net
Address: 79.79.79.80

*** public-dns-b.as9105.net can't find radio.entertainmenttechnologies.co.uk: Non-existent domain

Perhaps your tech people can look into it and see what is going on!

Paul

Re: DNS Issues with TalkTalk

Anonymous — Thu, 09 Jan 2025 08:53:24 GMT

Hi Paul,

Could you try powering down the router for a full 30 minutes as this will reset the current session. Could you then retest and let us know if this is still happening please?

Thanks

Michelle

Re: DNS Issues with TalkTalk

simmondp — Thu, 09 Jan 2025 09:04:05 GMT

Thanks for the prompt response.

We tried a full "factory reset" on the router to ensure anything cached is fully flushed out. In addition we've tried it on a friends TT Broadband with the same result.

If you are on a PC then simply put CMD into the search to run a Command window and type the following:

nslookup radio.entertainmenttechnologies.co.uk 8.8.8.8
this is Google's DNS, and then try TT's DNS by typing:
nslookup radio.entertainmenttechnologies.co.uk 79.79.79.80

As far as I can see this is a 100% repeatable problem.

Paul

Re: DNS Issues with TalkTalk

Karl-TalkTalk — Thu, 09 Jan 2025 09:26:32 GMT

Has this only just started happening ? Is this only affecting radio.entertainmenttechnologies.co.uk

Thanks

Karl.

Re: DNS Issues with TalkTalk

simmondp — Thu, 09 Jan 2025 09:35:29 GMT

We've only just been alerted to this, is seems to be specific to this domain, and only to TT - no other ISP's seem to be having this issue.
If you reprogram the router to use any other DNS Service then it's not a problem.

Have you tried the two commands on you end, as from here, it seems to conclusively a TT infrastructure issue, not a router issue.
However, this is an Ofcom licensed radio stream you appear to be blocking.

Re: DNS Issues with TalkTalk

Karl-TalkTalk — Thu, 09 Jan 2025 09:43:00 GMT

We would not be blocking this, if we were , then you would be directed to a holding page when trying to access the website etc. If they have recently changed or updated their IP address, it can take a little time for these to update across our DNS platform.

Trying this here, I get :

nslookup radio.entertainmenttechnologies.co.uk 79.79.79.80

Server: public-dns-b.as9105.net

Address: 79.79.79.80

Non-authoritative answer:
Name: radio.entertainmenttechnologies.co.uk
Address: 79.99.41.130

Karl.

Re: DNS Issues with TalkTalk

simmondp — Thu, 09 Jan 2025 09:54:18 GMT

Karl,

Going through a TT router, this is what we see here:

TT Router DNS Test

Paul

Re: DNS Issues with TalkTalk

Karl-TalkTalk — Thu, 09 Jan 2025 09:58:18 GMT

I'm using an asus router here, but on a TT connection, testing from works laptop and home PC so not seeing the issue.

Would you like to swap out the router and see if it still fails ?

Karl.

Re: DNS Issues with TalkTalk

simmondp — Thu, 09 Jan 2025 10:12:50 GMT

Karl,

Thanks for the offer, but no, as this is not an isolated issue, we get the same results on multiple TT routers / customers / BB lines.
We have also tried a full "factory reset" on one router, and the issue remains.

Paul

Re: DNS Issues with TalkTalk

Karl-TalkTalk — Thu, 09 Jan 2025 10:21:43 GMT

Are you currently trying this from a TalkTalk Line ? Your current IP address is non talktalk.

Can you update your 'Community Profile' with your live TalkTalk account so I can pass this across to our network teams.

Thanks

Karl.

Re: DNS Issues with TalkTalk

simmondp — Thu, 09 Jan 2025 11:00:41 GMT

You are correct! (I'm at work)
We are trying this on multiple lines;
The original problems was reported by a colleague and we diagnosed the problem/issue on his TT Line (and we also did the TT router reset)
I then repeated the tests on my mothers TT line (using a VPN connection - I have a Draytek behind her TT router).
Both are using vanilla TT routers and set-up
Paul

Re: DNS Issues with TalkTalk

simmondp — Thu, 09 Jan 2025 11:05:52 GMT

done

Re: DNS Issues with TalkTalk

Chris-TalkTalk — Thu, 09 Jan 2025 15:46:50 GMT

Hi simmondp,

Just to confirm, are you still experiencing this issue?

Chris

Re: DNS Issues with TalkTalk

simmondp — Thu, 09 Jan 2025 16:01:52 GMT

Yes! Just tried it again - still broken!

C:\WINDOWS\system32>nslookup radio.entertainmenttechnologies.co.uk 8.8.8.8
Server: dns.google
Address: 8.8.8.8

Non-authoritative answer:
Name: radio.entertainmenttechnologies.co.uk
Address: 79.99.41.130

C:\WINDOWS\system32>nslookup radio.entertainmenttechnologies.co.uk 79.79.79.80
Server: public-dns-b.as9105.net
Address: 79.79.79.80

*** public-dns-b.as9105.net can't find radio.entertainmenttechnologies.co.uk: Non-existent domain

For good measure:

C:\WINDOWS\system32>tracert 79.79.79.80

Tracing route to public-dns-b.as9105.net [79.79.79.80]
over a maximum of 30 hops:

1 24 ms 29 ms 25 ms 192.168.1.1
2 32 ms 27 ms 29 ms host-92-28-160-1.as13285.net [92.28.160.1]
3 34 ms 32 ms 32 ms public-dns-b.as9105.net [79.79.79.80]

Trace complete.

Paul

Re: DNS Issues with TalkTalk

Chris-TalkTalk — Fri, 10 Jan 2025 15:13:59 GMT

Thanks Paul. I've asked our Network team to take a look. I'll let you know when I receive an update or they may contact you directly

Chris

Re: DNS Issues with TalkTalk

simmondp — Tue, 14 Jan 2025 15:23:21 GMT

Hi Chris,

Any progress on this? - I've just checked and I'm still showing as:

C:\WINDOWS\system32>nslookup entertainmenttechnologies.co.uk 79.79.79.79
Server: public-dns-a.as9105.net
Address: 79.79.79.79

*** public-dns-a.as9105.net can't find entertainmenttechnologies.co.uk: Non-existent domain

Re: DNS Issues with TalkTalk

Chris-TalkTalk — Tue, 14 Jan 2025 15:32:19 GMT

Hi simmondp,

It looks as though our network team have tried to contact you, what is the best time to try again?

Chris

Re: DNS Issues with TalkTalk

simmondp — Wed, 15 Jan 2025 07:28:45 GMT

Chris,

Any time via my Mobile [removed]

Thanks

Paul

Re: DNS Issues with TalkTalk

Chris-TalkTalk — Wed, 15 Jan 2025 07:29:19 GMT

Thanks Paul, I've passed this over to our network team

Chris

Re: DNS Issues with TalkTalk

simmondp — Fri, 17 Jan 2025 12:34:36 GMT

Chris,

Still broken, still no contact from the network team!

d:\>nslookup radio.entertainmenttechnologies.co.uk 8.8.8.8
Server: dns.google
Address: 8.8.8.8

Non-authoritative answer:
Name: radio.entertainmenttechnologies.co.uk
Address: 79.99.41.130

d:\>nslookup radio.entertainmenttechnologies.co.uk 79.79.79.80
Server: public-dns-b.as9105.net
Address: 79.79.79.80

*** public-dns-b.as9105.net can't find radio.entertainmenttechnologies.co.uk: Non-existent domain

d:\>nslookup chilternvoice.fm 8.8.8.8
Server: dns.google
Address: 8.8.8.8

Non-authoritative answer:
Name: chilternvoice.fm
Address: 5.134.12.207

d:\>nslookup chilternvoice.fm 79.79.79.79
Server: public-dns-a.as9105.net
Address: 79.79.79.79

Non-authoritative answer:
Name: chilternvoice.fm
Address: 5.134.12.207

d:\>tracert 79.79.79.79

Tracing route to public-dns-a.as9105.net [79.79.79.79]
over a maximum of 30 hops:

1 30 ms 30 ms 27 ms 192.168.1.1
2 36 ms 26 ms 37 ms host-92-28-160-1.as13285.net [92.28.160.1]
3 34 ms 32 ms 32 ms public-dns-a.as9105.net [79.79.79.79]

Trace complete.