Is it possible to set up routing rules without connecting additional cables to the Cisco routers? The problem is that we have old Ciscos, and two ethernet ports are used already. We use Cisco 1841 routers.
Example: I am on a PC with IP address 192.168.1.19, and I need to access 192.168.2.25, which is in a branch office. My office PC firewall (pfSense) has two network cards with IP addressess set up on them 192.168.1.28 and 10.0.0.1. The branch office has a similar firewall. They are connected through a VPN.
This would look something like this, I guess:
192.168.1.19 (client) -> 192.168.1.1 (Cisco router) -> 192.168.1.28 (pfSense) -> 10.0.0.1 -> 10.0.0.2 -> 192.168.2.28 (pfSense) -> 192.168.2.1 (Cisco router) -> 192.168.2.25 (client)
I know this probably looks so bad, so you are welcome to criticize. I am just trying to learn networking while being sysadmin and have some constraints.
Basically here I want to set up VPN between two offices using different internet source and spare computers with pfSense installed.
Edit: I have created a detailed diagram if that helps to understand the reason behind this. I want to create a new VPN for a new "test" network in the branch office while not breaking old VPN connection. If this works, then I can replace the old VPN link.
The two ethernet ports on the Ciscos used for 1 - our main network, 2 - VoIP system.
Looking at the diagram, I guess if our internet traffic is routed through the firewall, the same way should be possible to route traffic between the subnets, correct?
Edit2: corrected picture IP addresses