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Site to Site VPN and External Web Resource

Posted on 2014-02-19
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Last Modified: 2014-02-20
We have a vendor that needs access to several of our internal webservers over HTTPS, but also needs access to an external website that can only be accessed via our public IP address.  We have them set up for a site to site VPN tunnel and we're NATing them from a DMZ IP to an internal IP address for each internal web server access.  

I'm trying to figure out what the best method would be to redirect them to an external website through our network and out to the internet.  One of the ideas I was playing with was some kind of virtual application delivery for IE via Citrix or another platform.

Is there an easier method to do this via creative NATing or do we need to deploy some sort of VDI-like application delivery to accomplish this?
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Question by:macdaddy2005
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Henk van Achterberg earned 250 total points
ID: 39872538
You can add the external IP address of that external website in the cryptomap (the networks the IPSEC connection agreed to tunnel). Then you can add a NAT statement that traffic coming from the vendor to this external IP of the external website is NAT-ed trough your WAN IP.

What for equipment do you have running?
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by:vijaydawda
vijaydawda earned 250 total points
ID: 39872712
Try the following method

Edit VPN parameters :

Do the following

1. Your Side (Which have public IP)

Edit the VPN connection

Add the IP of external web server in the local network (Subnet should be 255.255.255.255 (/32) )



2. Vendor Side

Edit the VPN connection

Add the IP of external web server in the remote network (Subnet should be 255.255.255.255 (/32)

Don't forget to add a VPN to WAN rule with NAT enabled.
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by:macdaddy2005
ID: 39873504
We're using an Adtran  NetVanta 1335, shared between multiple vendors.  Here's part of our CryptoMap.  

crypto map VPN 10 ipsec-ike
  description <vendor 1>
  match address VPN-10-vpn-selectors
  set peer <peer WAN IP>
  set transform-set esp-aes-256-cbc-esp-sha-hmac
  set security-association lifetime seconds 3600
  ike-policy 100
crypto map VPN 20 ipsec-ike
  description <vendor 2>
  match address VPN-20-vpn-selectors
  set peer <peer WAN IP>
  set transform-set esp-aes-256-cbc-esp-sha-hmac
  set security-association lifetime seconds 3600
  ike-policy 100

We NAT through our firewall.  The DMZ is attached to the trusted interface of the Adtran and the external interface is a public IP.
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Author Comment

by:macdaddy2005
ID: 39874385
I managed to get the NATing to work properly.  Instead of that public IP address going out via our firewall, like all other traffic, it was being redirected through another VPN device.  That VPN device did not have my DMZ in its routing table.  

Thanks for the help
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