Hi Cecilia, I don’t Think stunnel is the right tool for This job. If your target server R is outside your local net and has a limit on the IPs that can connect to it, you can configure your firewall to do NAT ( network address translation ). You just need to use the same outgoing public IP used by S for your other clients C1, C2, C3 when they connect to R. You can do NAT just for outgoing connections to R on port 22.
Saludos Jose Alfredo Diaz > On Jun 19, 2018, at 1:12 PM, Schultz, Cecilia <[email protected]> > wrote: > > Hello, > > I am trying to test stunnel to see if it can provide the functionality we > need. We are a Windows shop. > What we need is for multiple client machines (I call these C1, C2, C3) to > connect to our server (S). > Server S will connect to a remote SFTP server (port 22). I call the remote > SFTP server “R”. > C1, C2, C3 and S are all inside our firewall. > Currently S can connect and send files to R using SFTP (port 22). > The problem is that R does not accept a range of IP addresses, and has a > limit on the number of IP addresses they can accept. > > So, what I need is for C1, C2, C3 to be able to connect to server R using S > as a jump host. > From R’s perspective, it should be like the connection is coming from S. > > Question 1: can stunnel be used to accomplish this? > > Question 2: I have installed stunnel in a test server (“stunnel –install” > actually from the bin folder), and configured the conf like this: > > [sftp] > accept=127.0.0.1:22 > connect=some.remote.server.com:22 > > I tried to use Winscp SFTP client to test a connection, but it times out. > I then checked S, and I don’t see anything listening on port 22. I did > “netstat –a” and I don’t see anything listening on port 22. > > Was something wrong in the “stunnel –install” command? Shouldn’t it be > listening on port 22? > Also, I uncommented the entry for log, but I don’t see any log file in the > stunnel folder/subfolders > > ; Debugging stuff (may be useful for troubleshooting) > debug = info > output = stunnel.log > > > Thanks for your help, > Cecilia > > _______________________________________________ > stunnel-users mailing list > [email protected] > https://www.stunnel.org/cgi-bin/mailman/listinfo/stunnel-users
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