topic ASA 5520 NAT problem in Network Security

ASA 5520 NAT problem

shahid_duet — Mon, 11 Mar 2019 21:12:26 GMT

Dear boss

Please see my attachment.

I want to do static NAT 203.88.148.85 ->172.29.1.5 and 192.168.0.241->172.29.1.5

That means all outsider will get mail server by 203.88.148.85 and local user will get mail server by 192.168.0.241.

For that i did :

router :

interface GigabitEthernet0/0

ip address 203.88.148.84 255.255.255.248

ip nat outside

interface GigabitEthernet0/1

ip address 10.0.0.1 255.255.255.252

ip nat inside

ip route 0.0.0.0 0.0.0.0 203.88.148.81

ip route 172.29.1.0 255.255.255.0 10.0.0.2

ip route 192.168.0.0 255.255.255.0 10.0.0.2

ip nat pool IP_POOL 203.88.148.84 203.88.148.86 netmask 255.255.255.252

ip nat inside source list 1 pool IP_POOL overload

ip nat inside source static 172.29.1.5 203.88.148.85

access-list 1 permit 192.168.0.0 0.0.0.255

access-list 1 permit 172.29.1.0 0.0.0.255

ASA:

interface GigabitEthernet0/0

nameif inside

security-level 100

ip address 192.168.0.240 255.255.255.0

interface GigabitEthernet0/1

nameif outside

security-level 0

ip address 10.0.0.2 255.255.255.252

interface GigabitEthernet0/2

nameif DMZ

security-level 50

ip address 172.29.1.1 255.255.255.0

access-list OUTSIDE-IN extended permit ip any 172.29.1.0 255.255.255.0

static (DMZ,outside) 172.29.1.5 172.29.1.5 netmask 255.255.255.255

access-group OUTSIDE-IN in interface outside

route outside 0.0.0.0 0.0.0.0 10.0.0.1 1

But i cant get 203.88.148.85 from internet and 203.88.148.81 from 172.29.1.5. same in case of local net.

what can i do now ? where my missing ?

can u help me plz .

thanks

shahid

ASA 5520 NAT problem

Anu M Chacko — Tue, 16 Aug 2011 15:36:37 GMT

Hi Shahid,

For the first part, the static should be:

access-list OUTSIDE-IN extended permit ip any 203.88.148.85 255.255.255.255

static (DMZ,outside) 203.88.148.85 172.29.1.5 netmask 255.255.255.255

For the second part,

static (inside,inside) 192.168.0.241 172.29.1.5

same-security-traffic permit intra interface

Hope this helps!

Regards,

Anu

P.S.Please mark this question as answered if it has been resolved. Do rate helpful posts.

ASA 5520 NAT problem

shahid_duet — Tue, 16 Aug 2011 15:48:14 GMT

dear Anu

I already did NAT in router, as static nat mapping on 172.29.1.5 itself in asa.

Is it wise to NAT again in ASA 5520 ?

Pls tell me

shahid

ASA 5520 NAT problem

Anu M Chacko — Tue, 16 Aug 2011 18:05:37 GMT

Hi Shahid,

Yes, in that case NAT should not be done on the ASA. The IP 203.88.143.85 is from the NAT pool IP_POOL. Could you have this IP be excluded from this pool and test?

Let me know.

Regards,

Anu

ASA 5520 NAT problem

shahid_duet — Wed, 17 Aug 2011 08:28:16 GMT

Hi Anu

when is use

ip nat inside source static 172.29.1.5 203.88.148.85 i dont get.

i just chaned ip nat inside source static tcp 172.29.1.5 25 203.88.148.85 25 and getting.

now i removed ip nat inside source static tcp 172.29.1.5 25 203.88.148.85 25 and still getting.

colud u pls differentiate two NAT.

Now I need to NAT 192.168.0.241 to 172.29.1.5 as 192.168.0.10 pc get mail server by 192.168.0.241.

Pls suggest me

Thanks

shahid

ASA 5520 NAT problem

Anu M Chacko — Thu, 18 Aug 2011 08:33:06 GMT

Hi Shahid,

The difference between those 2 NATs is that one NATs traffic that comes to port 25 and the other NATs all traffic that comes to 203.88.148.85. it is strange that changing the entries back and forth made the traffic go through. For the192.168.0.10 NAT, did you try:

static (inside,inside) 192.168.0.241 172.29.1.5

same-security-traffic permit intra interface

Let me know.

Regards,

Anu

ASA 5520 NAT problem

cadet alain — Thu, 18 Aug 2011 11:00:53 GMT

Hi,

You didn't solve problem from the post in network infrastructure forum?

Regards.

Alain.