Originally Posted by bratas
VPN is only part right, there are 2 types of VPNs. I would suggest setting up a IPSec VPN between the 2 offices. You will need either a Cisco Router with a VPN Accelerator or a Firewall and both locations. If you don't have the skills necessary to complete this you may need to outsource it.
The other type of VPN is SSL VPN. That is normally used for things like remote access. SSL VPN is cane be setup via software, where as IPSec VPN tunnel is normally between 2 devices encrypting all traffic between those devices. If your using Cisco Routers, you will need to set up a GRE tunnel before you set your IPSec up.
Yes and no. All Cisco ISR's are capable of doing site-to-site VPN's without the need for accelerator modules, and the only reason you'll need a GRE tunnel is you have the need for passing multicast traffic between sites (routing updates, etc.) If you're using pure static route entries you can get by with just a IPsec site to site VPN.