SAGEMCOM FAST 5364 - can't change Primary DNS address to use local Pi-Hole DNS filter

[anchorman73]

I've only just noticed that my DCHP information given out to my equipment has changed.  I'm running firmware SG4K100206 and I was previously able to set my Primary DNS server to be on my local network i.e. 192.168.1.3.  I run a Pi-Hole DNS filter at this address.  I'm now no longer able to do this.  It looks like I'm only able to set primary DNS to 79.79.79.79 & Secondary DNS to 79.79.79.80.  If I blank out the fields then 192.168.1.1 will set as my Primary DNS server.

How do I make 192.168.1.3 my Primary DNS address now?

All help will be vert appreciated.  Many thanks.

[Michelle-TalkTalk]

Morning,

I'm really glad to hear this and thanks for letting us know 🙂

Thanks

Michelle

[anchorman73]

Good news!  Replacement router connected and seeing the internet.  Set up my specifically names SSIDs, changed the router admin password and changed the default DNS ip address to be given out by DHCP.  All good - no errors.

It's working as it should.  I'll return the old router this week.

Many thanks for all your efforts.  I'm happy again 😁

[Karl-TalkTalk]

No Problem 🙂

Karl 

[anchorman73]

New router arrived.  Will replace over the weekend  when it's more convenient and let you know the outcome. 

[Debbie-TalkTalk]

No problem 🙂

[KeithFrench]

Thanks @Debbie-TalkTalk 

[Debbie-TalkTalk]

Hi @anchorman73 

I'm really sorry to hear this.

I've ordered you a replacement router, please allow 24-48hrs for this to arrive.

Please let us know how you get on.

Thanks

Debbie

[anchorman73]

Hello,

I've followed your steps and now I have a big problem.  The router has been reset but now I can't log in as the 'admin' user.  The password on the back of the router, on the card, doesn't work;  my old 'pre-reset' password doesn't work and none of the existing WiFi SSIDs I set up have changed.

I've also performed the reset procedure by following the Talktalk instructional video - pressing and holding in the reset button on the back on the router for 30 seconds, after turning the router on.  Unfortunately I get the same result as the software reset above.

I can't access or control my router now.  I think I need a replacement.  Please can somebody help?

[KeithFrench]

Hi @anchorman73 

Log into the router & go to:-

Dashboard > See internet settings > Manage advanced settings > TalkTalk Wi-Fi Hub > Maintenance > Resets

Then click the Reset button next to "Factory Settings".

[anchorman73]

Sorry for the delay in replying  - I've been away.  I'll perform a factory reset Tuesday this week (not sure how to do that yet) and I'll post an update shortly afterwards.

[KeithFrench]

You should not be specifying a public DNS server at that point, whilst it is allowed it renders the DNS process inefficient. Just delete the 79.79.79.80 entry. However, I do not know if this will work as you have hardware revision V3?

Did you ever try the factory reset of the 5364?

Whilst you are obviously allowed to run your own DNS server, do you need anything over & above that which is already provided within the router's DNS server?

[anchorman73]

My hardware details are :-

Hardware Details

My current DNS settings are :-

Current DNS settings

I want to change the primary DNS server to be 192.168.1.3 but I get the error message below :-

Proposed DNS setting

[KeithFrench]

Hi @anchorman73 

I can confirm that it is not something we have ever seen before, which hardware revision are you on?

The information below is provided by TalkTalk, for confirmation please contact @Debbie-TalkTalk or@Michelle-TalkTalk.

KeithFrench is one of our valued Community Stars and can help with a range of issues related to wireless and networking. At times he may ask you to send him test results via a Private Message to help analyse/diagnose an issue. Although Keith does not work for TalkTalk, he very kindly shares his time and knowledge to help with others.

If you need further help or, if we need to take any details such as personal information about your account like phone numbers, account numbers etc. one of the TalkTalk team will jump in and help out.

[anchorman73]

Thanks Keith.

If someone could confirm if this is an issue with the Sagemcom 5364 and the SG4K100206 firmware i'd appreciate it.

Many thanks.

[KeithFrench]

No, it just worked. The error that you got though has been seen before in other parts of the UI, typically with the 5364 running V3 hardware, so that might be the issue. I cannot replicate that as I have the 5464.

[anchorman73]

Hi Keith,

Thanks for taking time to look into this.  Did you have to perform a factory reset first?

[KeithFrench]

Hi @anchorman73 

I have managed to test this now, changing the DNS server to be handed out via DHCP works:-

DNS server config

To prove a point I did an ipconfig /all Windows and the allocated DNS server was 192.168.1.3:-

Connection-specific DNS Suffix . : lan
Description . . . . . . . . . . . : XXXXXXXXXXXXX
Physical Address. . . . . . . . . : XXXXXXXXXXXXXX
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : XXXXXXXXXXXX(Preferred)
IPv4 Address. . . . . . . . . . . : XXXXXXXXXXXXXX(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : 08 February 2025 10:35:57
Lease Expires . . . . . . . . . . : 09 February 2025 11:05:25
Default Gateway . . . . . . . . . : 192.168.1.1
DHCP Server . . . . . . . . . . . : 192.168.1.1
DHCPv6 IAID . . . . . . . . . . . : 276052724
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-29-D9-10-09-D8-5E-D3-40-0F-E3
DNS Servers . . . . . . . . . . . : 192.168.1.3
NetBIOS over Tcpip. . . . . . . . : Enabled

What I do not have access to is an actual DNS server on my local network, so cannot prove if it works as a DNS Cache or not.

[KeithFrench]

Have you tried a factory reset of the router? I will try and test this later today.

[anchorman73]

I tried this. I changed the primary DNS server to 192.168.1.3, clicked the 'Apply' button, after which I got a pop-up message in red saying  -

'Operation could not complete. Something went wrong'.  Then press the cancel button and you're kicked out of your router, wanting you to log in again.

Either there's some reason the router won't allow this, or there's a problem with this firmware.

[KeithFrench]

The DNS servers of 79.79.79.79 etc are the TalkTalk default DNS servers. If you want to use a different DNS server on your local subnet, rather than the router of 192.168.1.1, this is done from the Advanced mode. Go to:-

Dashboard > See Wi-Fi Settings > Manage Advanced Settings > TalkTalk Wi-Fi Hub > DNS

I haven't tried using a different local DNS server, but it should work if you set this to 192.168.1.3. It will then be handed out to your clients via DHCP.