[Pix] VPN Site To Site with Nat

Unanswered Question
Oct 8th, 2007

Hi all,

Can someone help me please

An inside server (192.168.92.6) need to access to a remote network 192.168.31.0.

A VPN site to site is established between Pix outside (192.168.111.6) and Multitech Firewall (192.168.111.200).

Now my inside server should connect to the remote network with this IP 172.20.20.6. So I have to Nat my inside server IP (192.168.92.6) to 172.20.20.6.

The remote network should connect to inside network by the 172.20.20.6.

My problem is I can establish a connexion to my inside network from the remote network but I cannot establish connexion (tcp) from my inside network to the remote network.

The weird thing is I can ping from both network each other.

This is my config below

access-list Outside_1_cryptomap extended permit ip 172.20.20.0 255.255.255.0 192.168.31.0 255.255.255.0

access-list Inside_nat_static extended permit ip host I92.168.92.6 192.168.31.0 255.255.255.0

static (Inside,Outside) Ip_172.20.20.6 access-list Inside_nat_static dns

crypto ipsec transform-set ESP-3DES-SHA esp-3des esp-sha-hmac

crypto map Outside_map 1 match address Outside_1_cryptomap

crypto map Outside_map 1 set pfs

crypto map Outside_map 1 set peer 192.168.111.200

crypto map Outside_map 1 set transform-set ESP-3DES-SHA

crypto map Outside_map interface Outside

crypto isakmp enable Outside

crypto isakmp policy 10

authentication pre-share

encryption 3des

hash sha

group 2

lifetime 86400

no crypto isakmp nat-traversal

service-policy global_policy global

tunnel-group 192.168.111.200 type ipsec-l2l

tunnel-group 192.168.111.200 ipsec-attributes

pre-shared-key *

Thanks for answers

I have this problem too.
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rmeans Fri, 10/12/2007 - 12:02

ACL Outside_1_crytpomap defines a class C network for 172.20.20.0/24. In your descriptions you talk about just one server (172.20.20.6). Do you have other hosts in the 172.20.20.0/24 network that need to traverse the VPN? Should acl Outside_1_cryptomap be permit ip host 172.20.20.6 192.168.31.0 255.255.255.0?

Keep in mind that VPNs need to match both sides. Is the Multitech defining a single host or a class C network?

Rick

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