NethServer Version: 7.9
192.168.32.1: ROUTER = gateway with dhcp server, promotes 192.168.32.7 and 22.214.171.124 as DNS, also provides itself a miniature DNS service (<10 items as local DNS fallback)
192.168.32.6: nethserver instance, ovpn configured
192.168.32.7: nethserver nsdc controller
From the beginning I encountered a small DNS glitch in my NS instance: an error stating that one or more DNS servers don’t answer. (addresses like 126.96.36.199, 188.8.131.52, 184.108.40.206, 220.127.116.11 …) I didn’t bother about this too much. Everything seemed to work somehow.
Lately I sometimes get a connection to my NS instance, when trying to connect to the router by IP in a browser. Thus, not the config screen of the router appears, but the website of the NS. This happens sometimes, at maybe 50 percent chance, not always. Which is weird. (I never could access local devices via ovpn tunnel, except xx.6 and xx.7, although I tried to set up a route and trusted network. Don’t know if this is relevant.)
But, most important: I cannot resolve any external domains, when propagating xx.7 as first DNS via the routers dhcp. Local DNS at xx.7 can’t resolve them for sure, but it stopped forwarding the request to another DNS. (Clients receive both DNS with the dhcp lease.)
So I have three questions:
- Why do I have trouble with DNS servers of high availability?
- Why does my NS instance deliver content when I ask for the router?
- Why does my nsdc DNS not forward requests for external sites?
Where to look? - I am not a pro, just an enthusiastic end user, so verbosity is appreciated.