@terziyski 

Hi,

I want to thank you for your help and clarifications. But lets clarify this a litlle bit more:)

1. Worst thing is that such things are not mentioned in manual at all, to be exact what will happen when I switch the router to AP mode. Because of that I could only guess what am I doing wrong when I was not able to access my router after mode switch as I was trying to configure it with direct attachment via the wire. I was only able to understand what is going on when I swithed on the sniffer on this direct connection. Now lets go a little bit further. Lets imagine, that I switched router to Ap mode and as you are saying router turned on Smart DHCP mode. What P will it get? I've tried 192.168.0.1, 192.168.1.1 without any luck. And I'm not sure that smart DHCP mode was working correctly as I saw neverending attempts from the router to get IP from DHCP for itself. And I still think that retaining management IP would be the better choice as I initially configure my routers by dirrect attachment, and such behaviour broke everything and I was not able to access the router after switch to AP mode:( Tplink must understand, that not everyone leave their routers with default IP addressess or try to do initial configuration by plugging the router in the network.

2. Now lets pretend that the router is in AP mode. I have DHCP server turned off completely on this router. It is working mainly as the switch/bridge. I have management IP set manually on the router as I newer use DHCP for management IPs on my network devices. So now there goes my major question - how can I specify DNS server for the router itself in such case? Router needs to solve NTP servers, tplink update servers, maybe my local clients. How will it do such things without DNS server specified?

3. And one more very interesting thing. While I scaned this router which was in AP mode, I saw, that it has freely available built in and perfectly working DNS server which can use anyone. Such thing may be a security hole sometimes. So my question - is there any way to disable this built in DNS server?

@terziyski 

Hi,

1. I think that there is no point to discuss here. I still think that documentation is not clear in this place and I still think that such behavior (on mode switch) is not right as in my case I was not able to configure my router at all to which I was directly attached. Even my browser (when I switched the mode) has redirected me to tplinkwifi.net page where was clear instructions to connect to 192.168.0.1 or 192.168.1.1 IP address:). But it is as it is at least I know what to expect from this mode change and I think that I'll write a suggestion for Tplink to change a documentation at least. 

2. My dear friend. Everything is not so simple as it could look. Not everyone has a network from only two devices. As in my case, this AX72 is connected to a switch. And my gateway (which AX72 is using) is not a DNS server for sure. So what do you suggest me in that case?:)  How can I specify DNS server in such case? As for now I use IP which AX72 gets from my DHCP. It seems it is able to use DNS which is specified in DHCP lease configuration but I do not like this solution as I do not wat to use auto assigned IP address for my network device.

3. Now regarding DNS. Scan results show:

PORT    STATE SERVICE
53/tcp  open  domain
80/tcp  open  http
443/tcp open  https

So I've tried to connect to this DNS, tried to solve some IP and everything was working. As my device is not the DHCP server I want to be able to disable this DNS as DNS servers may be security holes in some specific situations, especially not patched ones. But AX72 interface shows nothing regarding this DNS.