dnat porta 53_tcp

ASG 8,202,
I created a DNAT for ssh, 22, and 53 for the service DSN, to my server behind ASG.

If I telnet to port 22 works, if I telnet to tcp 53 is not working, why?
There 'a mistake?

Port 53 is open locally, because if you launch NMAP is present.

thanks

0 BAlfson over 13 years ago

Please show the complete definition for your port 53 DNAT. Perhaps, instead of that, you would want to configure 'Network Services >> DNS'? You might find DNS Best Practices helpful.

Cheers - Bob

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0 giuseppe121 over 13 years ago in reply to BAlfson

Hy BAlfson,
i have public wiht DNAT the webmib port 10000 but does not work.
I have public with DNAT the SSH port 22 .
this is working properly.
how is it possible?

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0 BAlfson over 13 years ago

You can check with tcpdump, but my guess is that the Astaro is doing what it should, and that it is the server at ???_80.6 that is not responding.

Not sure why you're using the SNAT instead of a masquerading rule...

Cheers - Bob

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Gold Solution Partner since 2005

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0 peterkieser over 13 years ago

DNS uses UDP Port 53, except for large DNS queries (over a certain number of bytes.) Your DNS resolver might not even use TCP.
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dnat porta 53_tcp

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