Problems with connecting 2 sites with same IP range via VPN

20 pts.
Tags:
Cisco 1700
IP address conflicts
IPsec VPN
Routers
VPN
VPN issue
We are about to connect 2 sites together using IPSec VPN and both of the sites have exactly the same Private 10.0.0.0 255.255.248.0 addressing scheme but neither can change on account of server setup. Just wondering if anyone knows of any problems with 2 sites having the same Private addressing scheme when connecting through VPN?

 



Software/Hardware used:
CISCO 1700 Series Router

Answer Wiki

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Yes is the short answer, I have done it before and it can be a bit of a pain. I have attached a link to a document that Cisco host and it has a pretty good basic example of configuration although it does not take internet access into consideration.

The important thing to note is that IP addresses do indeed need to be unique, if they are not then essentially you are finding away to disguise them using NAT before the encryption process take place. Its also worth bearing in mind that whilst this works for the IP layer you still have to consider the affects on DNS.

Here is the document:
<a href=”http://www.cisco.com/en/US/tech/tk583/tk372/technologies_configuration_example09186a00800b07ed.shtml”>Configuring an IPSec Tunnel Between Routers with Duplicate LAN Subnets</a>

Please feel free to ask anymore questions.

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