topic Re: 8.3 Nat in Network Security

8.3 Nat

s.nicholls — Mon, 11 Mar 2019 18:34:55 GMT

Is it possible to configure the ASA to forward a packet with a destintion port of 80 to a destination port of 8080, without translating the original destination IP address?

Re: 8.3 Nat

Jennifer Halim — Sat, 04 Sep 2010 11:54:57 GMT

Yes it is possible

Here it is for your example:

object network test
host 1.1.1.1
nat (inside,outside) static 1.1.1.1 service tcp 80 8080

Re: 8.3 Nat

s.nicholls — Sat, 04 Sep 2010 18:44:48 GMT

I tried this and I get back this error message in the logs ASA-5-305013
Asymmetric NAT rules matched for forward and reverse flows; Connection for tcp src Outside:94.14.239.49/11199 dst SF1-Interface:109.74.241.215/80 denied due to NAT reverse path failure

Re: 8.3 Nat

Kureli Sankar — Mon, 06 Sep 2010 01:43:43 GMT

If you inside server is listening on 8080 then the example should be like this.

object network test
host 1.1.1.1
nat (inside,outside) static 1.1.1.1 service tcp 8080 80

Follow this link: https://supportforums.cisco.com/docs/DOC-9129

Regarding the syslog that you are seeing you can refer this link: https://supportforums.cisco.com/docs/DOC-12569

Pls. collect the output of the following:

Outside:94.14.239.49/11199 dst SF1-Interface:109.74.241.215/80

packet-tracer input Outside tcp 94.14.239.49 11199 109.74.241.215 80 det

packet-tracer input SF1-Interface tcp 109.74.241.215 80 94.14.239.49 11199 det

See the section towards the end where it says dropped and check the reason and the nat line that it is matching.

Post the output if you have questions.

-KS