NAT VPN tunnel and still access Internet traffic

Hello

Thank you in advance for any help you can provide.

I have a server with the IP 192.168.1.9 that needs to access a subnet remote from 192.168.50.0/24, through the Internet.  However, before the server can access the remote subnet, the server IP must be NAT'ed to 10.1.0.1 because the VPN gateway remote (which is not under my control) allows access to other customers who have the same subnet address that we do on our local network.

We have a 2801 Cisco (running c2801-advsecurityk9 - mz.124 - 15.T9.bin) set up to make the NAT.  It is the only gateway on our network.

I have configured the Cisco 2801 with the following statements of NAT and the relevant access lists:

access-list 106 allow host ip 192.168.1.9 192.168.50.0 0.0.0.255

NAT extended IP access list
refuse the host ip 192.168.1.9 192.168.50.0 0.0.0.255
deny ip 192.168.1.0 0.0.0.255 192.168.3.0 0.0.0.255
ip permit 192.168.1.0 0.0.0.255 any

route allowed ISP 10 map
corresponds to the IP NAT

IP nat EMDVPN 10.1.0.1 pool 10.1.0.1 netmask 255.255.255.0
IP nat inside source list 106 pool EMDVPN
IP nat inside source map route ISP interface FastEthernet0/1 overload

When the server (192.168.1.9) attempts to ping on the subnet of 192.168.50.0/24 devices, the VPN tunnel is established successfully.  However, after that, the server is no longer able to access the Internet because the NAT translation for 192.168.1.9 has changed since the external IP address of the router (FastEthernet0/1) at 10.1.0.1.

The documentation I've seen on the site of Cisco says that this type of Setup allows only host subnet communication.  Internet access is not possible.  However, maybe I missed something, or one of you experts can help me.  Is it possible to configure the NAT router traffic destined to the VPN tunnel and still access the Internet by using the dynamic NAT on FastEthernet0/1?

Once again, thank you for any help you can give.

Alex

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Hello

Rather than use a pool for NAT

192.168.1.9 - 10.1.0.1 > 192.168.50.x

ACL 102 permit ip 192.168.1.9 host 192.168.50.0 0.0.0.255

RM-STATIC-NAT route map permit 10
corresponds to the IP 102

IP nat inside source static 192.168.1.9 10.1.0.1 card expandable RM-STATIC-NAT route

ACL 101 deny host ip 192.168.1.9 192.168.50.0 0.0.0.255
ACL 101 by ip 192.168.1.0 0.0.0.255 any
overload of IP nat inside source list 101 interface FastEthernet0/1

VPN access list will use the source as 10.1.0.1... *.

Let me know if it works.

Concerning

M

Tags: Cisco Security

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