Lets say there is Machine A (Ubuntu) in Network A and Machine B in Network B. There is also Machine C (Windows 7) in Network B and I can access it through RDP from Machine A. What I need is to be able to reach Machine B from Machine A (i.e. can ping it, connect to arbitrary port, etc). How can I manage something like this?
PS: Network B is a dmz, i.e. I cannot directly access Machine B/C from the Internet, RDP is port-forwarded from dmz frontend server to Machine C.
RDP from A into C. In the RDP session of C, access B (RDP/SSH/whatever).
Essentially, you're using C as a jump host.
B from A, then directly access B from A. If you can't, you need to use a jumphost (or stepping stone or whatever you call it), and that's about the size of it, unless you want to open up your DMZ so it can be directly accessed by machine A, on an internal subnet. Which, believe me, you don't want to do. The whole point of having a jump host is to allow access through VLANs that you don't want wide open.
Aug 23, 2012 at 15:57