Application #4: Serial-Over-Secure-Tcp Tunnel - GE Multinet 4 Instruction Manual

CHAPTER 7: TERMINAL SERVER APPLICATION NOTES
7.8

Application #4: Serial-over-Secure-TCP Tunnel

MULTINET4 MULTI-PORT SERIAL SERVER & MANAGED SWITCH – INSTRUCTION MANUAL
Two Multinet4 devices are used to connect two serial devices over a TCP/IP network. This
example is like Application #2 except that all of the serial data passing over the network is
encrypted. In addition, the initial connection includes an SSL handshake that forces each
side to authenticate using RSA keys and X.509 certificates. This setup not only prevents
intruders from snooping on active serial sessions but it also prevents them from
connecting to an open terminal server port and impersonating a host.
FIGURE 7–11: Serial-over-Secure-TCP Tunnel
Both sides of the terminal server connection must be configured for SSL.
SSL is configured on the Multinet4 for serial port S1 as shown in the figure below:
FIGURE 7–12: Multinet4 Configured for Serial-over-SSL Tunnel
TERMINAL SERVER APPLICATION NOTES
7–13