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Any DNS Server Issues?

DistortedVision
Joining in

Is Virgin Media / O2 experiencing any DNS server issues.

I was just on this website:

www.photospecialist.co.uk

It then wouldn't load with DNS_PROBE_FINISHED_NXDOMAIN error.

I then tried on my phone with O2 with the wifi disabled and it wouldn't load either.

I then changed the DNS server settings from automatic to manually setting Google's DNS Server addresses (8.8.8.8 & 8.8.4.4) and it is loading perfectly fine now.

Can anyone that's using VM's DNS servers please test for me.

7 REPLIES 7

Client62
Legend

I am using a Hub 3 in Router mode with the default VM DNS.  I have Virus Safe On, Child Safe Off.

Using both Firefox and Edge the website displays no issues.

By changing the device DNS to a Public DNS you side step the VM WebSafe options for Virus Safe & Child Safe, perhaps one or both of those enabled in your Virgin Media online account.

用心棒
Very Insightful Person
Very Insightful Person

@DistortedVision, seems to be issue with some Virgin Media's DNS caches as @Client62 DNS query successfully resolved but neither yours or mine did.

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Client62
Legend

C:\Users\Philip>nslookup www.photospecialist.co.uk
Server: cache1.service.virginmedia.net
Address: 194.168.4.100

Non-authoritative answer:
Name: www.photospecialist.co.uk
Addresses: 2606:4700::6812:1ee2
2606:4700::6812:1fe2
104.18.30.226
104.18.31.226

An nslookup using Google Public DNS 8.8.8.8 returned identical results.

Client62_0-1691251006391.png

 

用心棒
Very Insightful Person
Very Insightful Person

Seems the DNS issue resolved itself as now the site is accessible. @DistortedVision, can you confirm this is also the case for you.

DistortedVision
Joining in

Yeah its working now. Though I'm wondering if there are any disadvantages to using Google's DNS servers permanently?

用心棒
Very Insightful Person
Very Insightful Person

Disadvantage… its Google.

Maybe onsider using Quad9, a not for profit foundation, or similar service. Read Quad9's  Data and Privacy Policy | Quad9

Client62
Legend

In our house there are a range of devices that are all DHCP clients so I do the same on my HP Workstation to ensure that I have the exact same VM experience and become aware of the issues at the same tine as every one else.

Changing DNS needs a good reason such as :

1) The ISP DNS is not working as expected as in this case. (Public DNS can be a temp. workaround)
2) You are looking for an advert blocking service from the likes of Adguard DNS
3) To implement Content controls / Malware protection from the likes of OpenDNS
4) A Private DNS / Encrypted DNS is required .  (DoH & DoT etc)
5) Implementing DNS redundancy by selecting DNS from 2 or more providers.

Changing DNS has some drawbacks to consider  :

1) Private DNS in Android are frequently not be supported over mobile data, causing loss of mobile internet
2) A public hot spot or office guest Wi-Fi may only function with their DNS
3) A Public DNS can be more remote and slower than the ISPs DNS
4) Public DNS that are free are likely to be a data gathering / data profiling for marketing purposes.