Basically I have two networks connected together with the internet, lets call them N1 and N2. On each network, there is a computer, C1 (in N1) and C2 (in N2). There is no port-forwarding between any of the network routers (R1 and R2) and the computers.
C2 also runs an ssh server. The whole purpose of my post is, how would C1 be able to connect to C2 via SSH? As mentioned there is no port forwarding, so even if any of the networks N1 and N2 had static ips, it wouldn't work.
The following network graphic should help clear the situation:
- N1 - First network.
- N2 - Second network, on the other side of the internet :)
- C1 - The computer an admin uses to SSH into C2.
- C2 - The target computer an admin may need to manage, probably would have
- S1 - The server that might coordinate the system.
- R1 - A router that provides an IP for C1 and port forwards some ports to S1. External IP address is static.
- R2 - Regular home network setup, router provides IP to C2 for internet connectivity. External IP address is dynamic.
- Yellow Lines - Physical connections.
- Green Lines - The virtual SSH connection - green line C1-R1 might actually need to be C1-S1-R1 instead.
A main aspect of this system is that an administrator can be on any PC within the R1 network to administer C2. As such, there cannot be any port forward between R1 and any PC in N1 (because it defeats the purpose of being able to use any computer on N1 to administer C2).