Accessing clients by hostname not working

[bilged]

I'm not sure if I'm doing this right at all - any tips would be greatly appreciated. On my router I set up a hostname and domain like: router and mydomain.internal. From a client PC I can ping either router or router.mydomain.internal successfully. Under LAN > DHCP server I can add clients on my network by name from the dropdown so the router is definitely recognizing them. I can also ping any client by IP address. However, I cannot ping by client hostname like ping mypc.mydomain.internal. Is there some additional step needed for this to work? Thanks!

Firmware is 386.7_2 on RT-AC68P

 

[ColinTaylor]

What does the complete output of nslookup mypc.mydomain.internal look like?

 

[bilged]

nslookup mypc.mydomain.internal
Server: 127.0.0.53
Address: 127.0.0.53#53

** server can't find mypc.mydomain.internal: NXDOMAIN

If I look at /etc/resolv.conf it has:

nameserver 127.0.0.53
options edns0 trust-ad
search mydomain.internal


and under /run/systemd/resolve/resolv.conf

it has

nameserver 192.168.0.1
search mydomain.internal

That looks correct (router IP and domain).

Edit: I think I figured it out. Seems like its an issue with Ubuntu. I did the below from the client which fixed it...

sudo rm -f /etc/resolv.conf
sudo ln -s /run/systemd/resolve/resolv.conf /etc/resolv.conf

Taken from the top answer here...

Ubuntu 18.04 .local domain dns lookup not working

I'm using a Raspberry Pi 3 with Ubuntu 18.04. At my company we have a DNS server and a couple of domains with ".local". I know technically this isn't correct and it should be ".lan" instead, because .

askubuntu.com

It seems this has been an issue for a while. Strange that ubuntu has it set up this way.