Linksys RV082 Site-to-Site VPN

Hello all,

I was wondering if anyone out there has had any experience setting up a Linksys RV082 VPN behind another firewall?

One of my customers has recently moved in to an executive suite and they are the only providers of internet for the entire building. They have their own firewall and have assigned us an internal static IP address. They said they are willing to forward ports for us, so my question is this:

What ports would I need to forward for the site-to-site VPN to work?

Site 1:
RV082 Public IP/192.168.0.x NAT local network

Site 2:
RV082 Public IP(controlled by leasing company) -> Static Internal IP/192.168.1.x NAT local network

Any help would be greatly appreciated.
stscomputingAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

pwindellCommented:
You can't just "forward ports".   It involves protocols beyond TCP and UDP based protocols.   Without going into big disertation about it,..there is no such thing as "forwarding ports" anyway.  Port are just addresses,..Layer4 Addresses to be exact and they are not "routable" which is the true meaning of "forwarding".  Port Forwarding is just a meaningless term invented by the "Home User" market.   What is really being done is Static NAT (aka Reverse NAT) and the IP#s (Layer3) are the focus of the action,..not the ports (Layer4).
Anyway,...for PPTP (TCP 1723) or L2TP (UDP 1701) you can cover them with Reverse NAT.  But that does not cover GRE which is not based on TCP or UDP.  To handle GRE the outermost Firewall (Landlord's Firewall) has to have a function that is most commonly called "VPN Pass-Through".  Not all firewalls can do that.  Also note that GRE is not port 47,...it is Protocol-47,...that is a protocol identifier, not a port number.
If the SIte-to-Site VPN is based only on IPSec then you need them to Reverse NAT IPSec NAT-T (UDP 4500).  I don't remember for sure if it also requires IPSec ESP,..this is not a "port",..it is a protocol "number",...(Number-50, Type: IP-Level, Direction Receive-Send)
IPSec will not work over NAT by itself,..it requires NAT-Traversal,...the the outermost firewall must be able to do NAT-T.
Since all of what I have mentioned is done on the outermost firewall before you even begin to configure your device,...the people in charge of it need to know and understand what they are doing.  I really have no details beyond what I have given. I have simply pulled this information from the items within my firewall.  This is not something I have performed personally.  I would really really hate to ever be in your kind of situation myself,...I would probably have made everyone miserable beforehand making sure that such a situation like this was never created.
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
pwindellCommented:
I tried to go to Linksys's site and get a PDF manual of your RV082 but I couldn't track it down.
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Hardware Firewalls

From novice to tech pro — start learning today.