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Router 2901 translation issue

gennari
Level 1
Level 1

Hi  there,

since some days I have an issue with my 2901 router: I can't reach my DNS server from an external network. My router listen on two public IP and from the first I can reach DNS, but not from the second.

 

The last test I did it had been set same static rule for both IP:

 

ip nat inside source static tcp 10.39.5.2 53 xxx.xxx.xxx.130 53 extendable

ip nat inside source static tcp 10.39.5.2 53 xxx.xxx.xxx.131 53 extendable

 

And the results are these: 

$ telnet XXX.XXX.XXX.130 53
Trying XXX.XXX.XXX.130...
Connected to XXX.XXX.XXX.130.
Escape character is '^]'.

 

$ telnet 46.235.141.131 53
Trying 46.235.141.131...
Connected to 46.235.141.131.
Escape character is '^]'.

 

$ nslookup mail.xxxxxxx.it XXX.XXX.XXX.131
Server:         XXX.XXX.XXX.131
Address:        XXX.XXX.XXX.131#53
Name: mail.xxxxxxx.it Address: XXX.XXX.XXX.131 Name: mail.xxxxxxx.it Address: XXX.XXX.XXX.131

 

$ nslookup mail.xxxxxxx.it XXX.XXX.XXX.130
;; connection timed out; trying next origin
;; connection timed out; no servers could be reached

Even with a different IP address for 130 DNS do not change the situation.

Do anyone have idea of causes of this strange behaviour?

 

Thanks in advance.

 

Ale

 

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