Welcome to this user forum.
There are a number of them, and they are allocated each time a dynamic IP address is requested, and you cannot change them on the home hub 5.
If you want to use your own DHCP server, then you would have to turn the home hubs DHCP server off.
You would then be free to use your own DNS servers like OpenDNS, or Google public DNS.
You can change DNS settings to manual on the BTHub5, all you have to do is as follows:
When on this page you see all of the related Internet configuration info including BT DNS servers. Next you do as follows:
I tested this with OpenDNS servers and it all works and I can now restrict access to sites based on my OpenDNS policies.
Hope this helps.
Great info dakinepro, thanks for the heads up, I've been trying to change my DNS servers away from BTs for some time now, what with the YouTube fiasco which hit me badly, but I've not been able to.
Unfortunately, in my case, when I disconnect as you describe I do not get an option show up anywhere i can find to change DNS to manual. Have I an out of date box or something? The system reports: BT Home Hub (Type A). Software version 18.104.22.168.22.214.171.124. Last updated 28/08/14.
Just dug my HH5 out of the cupboard. No manual DNS options, Software version 126.96.36.199.188.8.131.52.
I suspect that this may only apply to the non-BT supplied HH5s. I guess the BT supplied ones have their setting locked to make support easier.
I have a stock BTHub5 direct from BT with following firmware:
BT Business Hub 5 (Type A) | Software version 184.108.40.206.83.8.200 | Last updated 19/12/14
The way to access the manual DNS setting has changed slightly to what I posted above(since I changed my broadband username) however I can still manually add DNS.
Worked for me anyhow...