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Topics - Shaggy1


I have a Netgear Nighthawk router with dd-wrt.

I have opened up a couple of ports on my router which I have NATed to point to a web server running on a machine in my LAN and registered a domain name with a domain name provider so I can access using a domain.

The web server is accessible from my own network and also it seems to an external network which is using my ISP (at least I can accesss it using one of my neighbours network which uses the same ISP as me).

However when I try to accesss my LAN from an external network not using my ISP theree is no access - messages get sent, but there are never any replies, so it appears to be completely blocked. I cannot even ping my router's (WAN) IP address (I have opened up ping on my router).
(nslookup does correctly resolve the ip address of my router from the domain name)

Does anyone have any idea what might be blocking eccess from external networks ?
And can anyone tell me how I might go about determining why and where access is blocked ?
(I do have a neighbour either side whose networks (one using a different ISP, the other using the same ISP as me) from which I can run tests ).
Troubleshooting / How to register a DN and setup DDNS ?
February 18, 2023, 10:37:16 AM

I have a home setup which uses a dd-wrt router hooked up via pihole dns which sends traffic over a vpn.
I have set things up such that I can access the web server from an external site using my WAN ip address (or the DN url I get by doing nslookup on that adddress)

I'd now like to be able to access a web server running on my local LAN using a DN, but am struggling to understand how this would work and what information I need to do this

I was wondering if anyone might be able to clarify first how this fits into the network infrastructure and second what information I need to give to the DN and DDNS providers to set it up.

From my searches as I understand it the setup should work something like this:
When a request for your DN (the external DN you registered with the DN hosting company) is made from an external network it is sent to the local DNS which sends it down the DNS hierarchy until your local (in my case my ISP DNS) receives the request.
This then forwards it to the DDNS server (that you registered with), which maps it to the WAN ip address of your router and sends the information back to the DNS. The DNS then knows the ip address to route to and the request is received at the WAN side of the router.

There is a DDNS client running on the router which continuously feeds the DDNS server with information about the ip address for the domain, so if the ISP changes the WAN IP the DDNS knows about it and things continue to carry on working (the home DN is still mapped to the correct ip address)

Is that roughly correct ?

Given that is the case:
How does the my ISP DNS know which DDNS server (i.e the DDNS I have registered with) to forward it's request to ?
What information do I need to provide to the DDNS service provider ? just the domain name I buy from the DN provider ?
Do I need to provide any DDNS information when I register the domain name for my host network ?
Is it important which I do first - register the domain name or register with a DDNS service ?
Given my router uses pihole for DNS should my DDNS client be running on the router or on pihole or does it not matter ?