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Does User Configured DNS on Smart Hub Plus Actually Take Effect?

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XRaySpeX
EE Community Star
EE Community Star

‎01-07-2025 07:58 PM

The latest f/ware updated SH+'s allow you to config your own DNS instead of using EE's or does it? 

My f/ware today updated to version r3.8.11-R-1414606-PROD-83002 & the ability to not have AUTO DNS Servers but to config your own appeared under Advanced Settings > My Network. So I set them to OpenDNS (208.67.222.222 & 208.67.220.220). Browsing & suchlike still works.

However the page Advanced > BB > Internet still shows the BT servers:

Broadband primary DNS: 81.139.56.100

Broadband secondary DNS: 81.139.57.100

So which set of DNS is the router using?

(I did reboot router in between so that changes take effect as it advised.)

I've only just had this f/ware update. I dunno when configurable DNS 1st appeared in the f/ware updates. Anybody remember?

If you think I helped please feel free to hit the "Thumbs Up" button below.

To phone EE CS: Dial Freephone +44 800 079 8586 - Option 1 for Home Broadband & Home Phone or Option 2 for Mobile Phone & Mobile Broadband

ISPs: 1999: Freeserve 48K Dial-Up > 2005: Wanadoo 1 Meg BB > 2007: Orange 2 Meg BB > 2008: Orange 8 Meg LLU > 2010: Orange 16 Meg LLU > 2011: Orange 20 Meg WBC > 2014: EE 20 Meg WBC > 2020: EE 40 Meg FTTC > 2022:EE 80 Meg FTTC SoGEA > 2025 EE 150 Meg FTTP
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JimM11
Community Hero
Community Hero
In response to XRaySpeX

‎02-07-2025 11:38 AM

@XRaySpeX The whole returned table so you can compare what your's does.

Hello! Your IP addresses are:
BSKYB-BROADBAND-MNT
Your DNS resolvers specify your IP subnet (ECS😞
BSKYB-BROADBAND-MNT
Your DNS resolvers are:
Google
MNT-GOOG-PROD
Great! Your DNS responses are authenticated with DNSSEC:
  ECDSA P-256 ECDSA P-384 Ed25519Valid signatureInvalid signatureExpired signatureMissing signature
PASSPASSPASS
PASSPASSPASS
PASSPASSPASS
PASSPASSPASS
Like this tool? Star us on GitHub. See more at addr.tools.
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JimM11
Community Hero
Community Hero
In response to XRaySpeX

‎02-07-2025 11:49 AM - edited ‎02-07-2025 11:51 AM

@XRaySpeX Try another DNS from the list below that should show, see what changes. Takes a couple to 30 seconds to fill all the tables below....

DNS Propagation Checker

 

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bobpullen
Star Contributor
Star Contributor

‎02-07-2025 05:23 PM

@XRaySpeX - you're comparing Apples with Oranges.

@XRaySpeX wrote:

My f/ware today updated to version r3.8.11-R-1414606-PROD-83002 & the ability to not have AUTO DNS Servers but to config your own appeared under Advanced Settings > My Network. So I set them to OpenDNS (208.67.222.222 & 208.67.220.220).

Doing this is asking the hub to assign custom DNS server addresses as part of its DHCP offer i.e. when the hub issues a LAN IP to clients, it also issues the DNS addresses you have specified. If you were to run something like ipconfig from a connected Windows machine then you would see that the network interface has the custom DNS assigned. This means your connected devices are going 'straight to the source' for DNS requests, rather than proxying/forwarding them through the hub.

@XRaySpeX wrote:

However the page Advanced > BB > Internet still shows the BT servers:

Broadband primary DNS: 81.139.56.100

Broadband secondary DNS: 81.139.57.100

These are the DNS addresses assigned to the PPPoE/WAN interface of the router. They are assigned by the RADIUS equipment out on the Broadband network. Any DNS requests your hub makes is using these resolvers.

@XRaySpeX wrote:

So which set of DNS is the router using?

The router is using the BT/EE DNS; Your connected devices are using your custom DNS.

Assigning custom DNS via DHCP is probably the preferred method (rather than changing the hub's DNS) as it's removing a hop/point of failure from the mix.

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JimM11
Community Hero
Community Hero
In response to JimM11

‎02-07-2025 05:59 PM

@XRaySpeX @bobpullen Bob posted this on another post so ideally the uPnP is also good to go for the old port fwd fixing, "I've just posted in another thread that the latest firmware for SH31B seems to have fixed UPnP (3.8.11). It wasn't working prior to this."

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XRaySpeX
EE Community Star
EE Community Star
In response to bobpullen

‎02-07-2025 06:06 PM - edited ‎02-07-2025 06:16 PM

@bobpullen : Good thinking! I was forgetting that DNS were handed to clients as part of their DHCP request.

Yes, my PC's ipconfig does show OpenDNS as its DNS:

DNS Servers . . . . . . . . . . . : 208.67.222.222
                                                      208.67.220.220
                                                      192.168.1.254

I'm sure when I checked this before it was only showing 192.168.1.254.

Thanks for solving this, @bobpullen , I was waiting for you to turn up.

If you think I helped please feel free to hit the "Thumbs Up" button below.

To phone EE CS: Dial Freephone +44 800 079 8586 - Option 1 for Home Broadband & Home Phone or Option 2 for Mobile Phone & Mobile Broadband

ISPs: 1999: Freeserve 48K Dial-Up > 2005: Wanadoo 1 Meg BB > 2007: Orange 2 Meg BB > 2008: Orange 8 Meg LLU > 2010: Orange 16 Meg LLU > 2011: Orange 20 Meg WBC > 2014: EE 20 Meg WBC > 2020: EE 40 Meg FTTC > 2022:EE 80 Meg FTTC SoGEA > 2025 EE 150 Meg FTTP
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bobpullen
Star Contributor
Star Contributor
In response to XRaySpeX

‎02-07-2025 07:50 PM

As an aside, the hub shouldn't still be issuing its own IP as tertiary DNS server. Doubt it will cause too many problems in practice but suspect it's another bug that will need squashing in firmware.

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XRaySpeX
EE Community Star
EE Community Star
In response to bobpullen

‎02-07-2025 07:56 PM

@bobpullen wrote:

These are the DNS addresses assigned to the PPPoE/WAN interface of the router. They are assigned by the RADIUS equipment out on the Broadband network. Any DNS requests your hub makes is using these resolvers.

As a matter of interest, when is the router ever required to make a DNS lookup of itself? It's not like it is doing any browsing of itself; it is predominately handling packets. I can understand it if it had an Access Control feature to blacklist any websites by domain.

If you think I helped please feel free to hit the "Thumbs Up" button below.

To phone EE CS: Dial Freephone +44 800 079 8586 - Option 1 for Home Broadband & Home Phone or Option 2 for Mobile Phone & Mobile Broadband

ISPs: 1999: Freeserve 48K Dial-Up > 2005: Wanadoo 1 Meg BB > 2007: Orange 2 Meg BB > 2008: Orange 8 Meg LLU > 2010: Orange 16 Meg LLU > 2011: Orange 20 Meg WBC > 2014: EE 20 Meg WBC > 2020: EE 40 Meg FTTC > 2022:EE 80 Meg FTTC SoGEA > 2025 EE 150 Meg FTTP
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JimM11
Community Hero
Community Hero
In response to XRaySpeX

‎03-07-2025 06:55 AM

@XRaySpeX Wonder if it is anything to do with the Router and Parental controls, although it is all app managed the router still has to block at the setup times that are pre-programmed, there may be a lot going on under the hood and EE have felt that best way to deal is to always use and trust there DNS Servers.

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bobpullen
Star Contributor
Star Contributor
In response to XRaySpeX

‎03-07-2025 08:17 AM

@XRaySpeX wrote:

As a matter of interest, when is the router ever required to make a DNS lookup of itself? 

Couple of obvious ones I can think of: -

  • When setting the time/date using an NTP server
  • When resolving the CWMP server address for remote management