topic ASA 8.0 nat problem in Network Security

ASA 8.0 nat problem

3moloz123 — Mon, 11 Mar 2019 20:52:38 GMT

Hi,

I have a newly setup ASA5505 running 8.0, with remote access (anyconnect) working

The clients can reach LAN, and vice versa.

I'm trying to figure out how the h*ck the nat is built, Ive even set all incoming and outgoing traffic to permited but with no luck.

With iptables in Linux, I would simply say "all traffic that leaves interface outside should be translated", something like this:

iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE.

I've tried every possible combination in ASA with no luck. Can you spot an obvious problem?

While pinging 8.8.8.8 for example, I see this in the log:

Jun 29 2011

07:41:16

302021

172.16.31.1

1024

8.8.8.8

Teardown ICMP connection for faddr 172.16.31.1/1024 gaddr 8.8.8.8/0 laddr 8.8.8.8/0 (user)

My config is as follows:

name 172.16.31.0 vpn-clientz description vpn clients

interface Vlan1

nameif inside

security-level 100

ip address 192.168.0.249 255.255.255.0

interface Vlan2

nameif outside

security-level 0

ip address 1.2.3.94 255.255.255.252

access-list vpn-clients remark tunnel all traffic

access-list vpn-clients standard permit any

access-list inside_nat0_outbound extended permit ip 192.168.0.0 255.255.0.0 vpn-clientz 255.255.255.0

access-list outside_access_out extended permit ip any any log disable

access-list outside_access_in extended permit ip any any log disable

access-list inside_access_in extended permit ip any any log disable

access-list inside_access_out extended permit ip any any log disable

ip local pool vpn-clients 172.16.31.1-172.16.31.20 mask 255.255.255.0

global (outside) 1 interface

nat (inside) 0 access-list inside_nat0_outbound

nat (inside) 1 sol-vpn-clientz 255.255.255.0

ASA 8.0 nat problem

Maykol Rojas — Wed, 29 Jun 2011 18:16:16 GMT

What is it that you want to NAT? The VPN clients? The inside network? Are you doing split tunnel on the group policy for the Anyconnect or you have tunnel all and want to provide internet access to the Anyconnect clients via the ASA?

Let me know.

Mike

ASA 8.0 nat problem

3moloz123 — Thu, 30 Jun 2011 06:18:40 GMT

Sorry for being unclear.

I want to source nat the vpn clients when going any direction BUT 192.168.0.0/16. I believe the split-tunneling do work at the moment:

group-policy somevpn internal

group-policy somevpn attributes

dns-server value 192.168.0.2 192.168.10.2

vpn-tunnel-protocol svc

split-tunnel-network-list value admins

address-pools value vpn-clients

access-list admins standard permit 192.168.0.0 255.255.255.0

ASA 8.0 nat problem

3moloz123 — Tue, 05 Jul 2011 09:18:00 GMT

Hey,

Any clues what might be wrong?

ASA 8.0 nat problem

praprama — Fri, 08 Jul 2011 22:42:35 GMT

Are you looking to nat the VPN clients when going out to the internet through the ASA? If that's the case, you need something like this:

nat (outside) 1 172.16.31.0 255.255.255.0

same-security permit intra-interface

and also remove split-tunnelling from the configuration completely.

Hope this helps!!

Regards,

Prapanch