Hello I have a problem with static DNS.
I am running ROS 2.9.43 on a dedicated AMD based PC.
I have in my internal network a Linux Debian mailserver ( Postfix ) and I wish my clients connect to it with it's name.
I had put a static DNS entry, this is the output:

[alex@badde1_pc] ip dns static> pr
Flags: D - dynamic
# NAME ADDRESS TTL
0 mailserv 10.5.50.252 1d
1 dnsbadde 10.5.50.1 1d

so my clients should insert MAILSERV as the SMTP out, buth this is not functioning.
If I try to ping MAILSERV it fails
The NSLOOKUP command gives this output:
SERVER: DNSBADDE
ADDRESS: 10.5.50.1


NAME: MAILSERV
ADDRESS: 10.5.50.252

So it seems that NSLOOKUP correctly finds the name-address association; but http or SMTP not.
I tryed also a: telnet mailserv
no success also with this command.
My DNS settings are:
[alex@badde1_pc] ip dns> pr
primary-dns: 62.211.69.150
secondary-dns: 0.0.0.0
allow-remote-requests: yes
cache-size: 2048KiB
cache-max-ttl: 1w
cache-used: 1368KiB

Please has someone some suggestion?
Do I missed something in the configuration?
Many thanks for your help
Regards
Alessandro

You should have redirect rules, that ensures that all clients use router DNS cache.
Like this,
'ip firewall nat add action=redirect dst-port=53 protocol=tcp chain=dstnat to-ports=53', the same for UDP protocol.

Hi Segejs, many thanks for your help.
unfortunately on the same MT box I am running a hotspot service, thus I have two dynamic rules added
by HS; they are:

2 D chain=hotspot protocol=udp dst-port=53 action=redirect to-ports=64872

3 D chain=hotspot protocol=tcp dst-port=53 action=redirect to-ports=64872

Are they needed?
Can I put the two suggested rules on top of these to intercept port 53 requests before the other above mentioned two?

many thanks for your help
Regards
Alessandro

Hi please anyone can explain the above problem?
I tryed by myself to put the NAT rules on top of the chain but the clients stopped to surf the internet
Many thanks
Alessandro

the same problem exsits with rc1, i.e. it DOES NOT work with keywords ONLY!
e.g. mailserv

If i try to ftp://mailserv and login - it says after a long time cannot get content,
even though the logs on MT shows a ftp user has logged in.

The only way around this is [.] in the keyword - e.g mailserv.linux or mail.serv

Hi JR, many thanks for your help.
Now it works, great
Regards
Alessandro

These rules are created by HotSpot, HotSpot is taking DNS requests to itself, then use settings from 'ip dns'.
2 D chain=hotspot protocol=udp dst-port=53 action=redirect to-ports=64872
3 D chain=hotspot protocol=tcp dst-port=53 action=redirect to-ports=64872

Hi JR, many thanks for your help.
Now it works, great
Regards
Alessandro

Sergejs - could you kindly explain this, thanks.
I really would like to use single keywords.

so my clients should insert MAILSERV as the SMTP out, buth this is not functioning.

try "MAILSERV." (with dot) on clients - it seems like it's working =)