FWSM: no nat-control or nat-control

Unanswered Question
Aug 5th, 2008

Dear All,

We'r using FWSM with 2.3(4) s/w

We intend to do no nat-control.

However, Version3.2 apparently can do this. How do we enable no nat-control or a similar function on v2.3?

More requirement, ideally we would want no nat control on some dmz1s/out paths and nat control on some dmz2s/out path.

Is this acheivable in both 2.3 and 3.2?

Thanks

SS

I have this problem too.
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Marwan ALshawi Tue, 08/05/2008 - 07:39

instead of playing with nat control do the following

lets say ur dmz1 subnet is 172.16.1.0 /24

and u wanna u se this subnet from the outside interface as there is no nat

do:

static (dmz1, outside) 172.16.1.0 172.16.1.0 netmask 255.255.255.0

and then make the permit ACL

because in FWSM not like ASA traffic denied by default even from higher security level to less

and then if u have device on dmz1 with ip 172.16.1.5 u gonna see it from outside as 172.16.1.5

and this can be don between any two interfaces u want

good luck

please, if helpful rate

s.srivas Tue, 08/05/2008 - 08:01

We'r trying to initiate (say ping for now) connections from inside to unknown/dynamically known outsides.

I can use 0.0.0.0 as outside to test. should the (outside, dmz1) work, if reversed?

Does this directional change make any difference. In the mean time i'm going to (again!) test your suggestion.

Marwan ALshawi Tue, 08/05/2008 - 16:49

there another way

also try and see it

let say ur inside network is

192.168.1.0/24

access-list 100 permit ip 192.168.1.0 255.255.255.0 any

nat (inside) 1 access-list 100

global (outside) 1 192.168.1.1-.192.168.1.254

rate if helpful

s.srivas Wed, 08/06/2008 - 00:40

nat (inside) 0

nat (outside) 0

I tried the above and working ok for now.

Will try the suggestion when we need to mix and match.

Thanks you Marwanshawi.

SS

s.srivas Wed, 08/06/2008 - 10:10

Thanks, it works with nat0

I'll be trying with nat1 later.

I also have another question, with v2.3, would nat 0 on one FWSM context and nat 1 on another context, but for the same interface/s work?

Marwan ALshawi Wed, 08/06/2008 - 18:23

sure u can because they are in defrent context then the source will be deffrent

and the nat policy will work independatly in each context

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