topic Re: Bidirectional NAT works, but..... in Network Security

Bidirectional NAT works, but.....

opers13 — Mon, 11 Mar 2019 15:43:52 GMT

with my last post, I got bidirectional nat to work from outside -> inside. Config below:

global (inside) 99 10.153.99.1

nat (outside) 99 10.148.12.0 255.255.255.0 outside

Now, the problem is getting NAT to work from inside -> outside. This is the error message:

%ASA-3-305005: No translation group found for icmp src inside:10.153.13.18 dst....

So when I config the following everything breaks: (meaning NAT in any direction stops working)

global (outside) 1 interface

nat (inside) 1 10.153.0.0 255.255.0.0

nat-control is disabled.

thanks in advance!

Re: Bidirectional NAT works, but.....

Jon Marshall — Tue, 16 Jun 2009 09:06:59 GMT

Alex

global (inside) 99 10.153.99.1

nat (outside) 99 10.148.12.0 255.255.255.0 outside

this not bi-directional NAT. What it does is translate any incoming 10.148.12.x address on the outside to 10.153.99.1 on the inside

Regardless, i'm not sure why your'e other nat is not working.

Try

1) removing both NAT statements. Then apply

nat (inside) 1 10.153.0.0 255.255.0.0

global (outside) 1 interface

and then

global (inside) 99 10.153.99.1

nat (outside) 99 10.148.12.0 255.255.255.0 outside

Don't forget to do a clear xlate when you make NAT changes.

Also your ping, what device are you pinging and is it located on the outside of the ASA ?

Jon

Re: Bidirectional NAT works, but.....

opers13 — Tue, 16 Jun 2009 09:17:21 GMT

Hi Jon, below is from cisco.com

"outside (Optional) If this interface is on a lower security level than the interface you identify by the matching global statement, then you must enter outside. This feature is called outside NAT or bidirectional NAT."

anyway, you think by applying the statements in different order could be the issue? I'm trying to ping a device on the outside.

I will give it a try..thanks!

Re: Bidirectional NAT works, but.....

Jon Marshall — Tue, 16 Jun 2009 09:22:14 GMT

Alex

I stand corrected 🙂 - +5

Jon

Re: Bidirectional NAT works, but.....

opers13 — Mon, 22 Jun 2009 17:52:40 GMT

Jon,

got this to work with the following:

Enabled same-security level:

same-security-traffic permit inter-interface

Changed security-level from 0 to 100

interface Ethernet0/2

speed 100

duplex full

nameif test

security-level 100

ip address 10.153.0.205 255.255.255.252

Added NAT 0:

nat (test) 0 access-list nonat

access-list nonat extended permit ip any any