DNS with static entrys won't work

RouterOS Beginner Basics
1

Hi there,

i have an old RB750G running v6.41.4.
I have a NAS in my Network, witch can be accessed from the outside through portforwarding via nas.mydomain.com (A-Record in the DNS Config on the Domain).
Internal i set a Static DNS Entry for nas.mydomain.com that points to the internal IP of the NAS.
These config was used 3 years and never made any problems.
But now i have here an WIN10 client, and every time i want to ping or name resolution (of course im in the internal network behind the Mikrotik) of the domain/host i always get as response the external IP and not the internal. The WIN10 client is set to DHCP and uses the DNS Server of the TIK.
Strange thing is that when i do nslookup on the Internal IP itself

nslookup 192.168.88.xxx
Server:  UnKnown
Address:  192.168.88.x

Name:    nas.mydomain.com
Address:  192.168.88.xxx

When i do a ping or name resolution e.g.on a android device i get back the right, internal IP as the static DNS entry is set.

Any idea about this behavior?
Thanks in advance

2

Packet sniffer is your friend. Capture traffic on port 53 and you should see immediately where the external address comes from. If the system perhaps ignores your DNS server and sends the query elsewhere (it shouldn’t), or if it’s adding some unexpected suffix to name (but it would be unlikely to resolve to your external address). Also you make sure you don’t have override in your hosts file.

3

Hello
thank u very much @Sob
such a simple solution.
My InternetSecurity Software from AVG has “manipulated” my DNS queries between my pc and the Mikrotik.