NSLOOKUP - Default Server: UnKnown

Question

_{Thursday, February 23, 2017 7:31 AM}

Im working as a IT administrator for a small business. There are 25 client systems and its across a single IP range.

Very standard ipv4 setup, Domain controller has DHCP and DNS configured but since a month having issues in recognizing the domain in NS lookup.

This has started to effect the wifi network and sometimes VPN users. In aan attempt to fix it I changed few settings for DHCP and DNS on the server and i feel i might have made things worse. 

I did get it to the point where everything is working, except a IPv6 address keeps popping up on the DNS records, I looked it up online and my research has made me disable ipv6 on the server via registry and the DNS forest.

Any suggestions, the main issue now is that the Wifi keeps dropping Internet even though its on a static IP and ipv6 disabled.

I got another router and its the same. even updated the firmware and then tested a apple airport as well with no luck.

All replies (1)

_{Thursday, February 23, 2017 1:12 PM}

First, this has absolutely nothing to do with IPv6, which by the way, always says no internet access because it's only used internally with Windows at this point. Do not ever disable IPv6 as there are components in Windows that rely on it's functionality. 

This problem is usually from either Winsock or the TCP/IP stack requiring a reset which is a very common problem.

Run the following two commands one at time, use an elevated command prompt, hit enter after each command "in bold". Then restart your machine. 

netsh winsock reset catalog (reset winsock entries)
netsh int ip reset reset.log hit (reset TCP/IP stack)