Appendix F - Null Modem Administration - Secure Computing SG300 User Manual

This section details how to enable your SnapGear unit for administration from a local PC
using a null modem serial cable.
This allows the local PC to "dial in" directly to the SnapGear unit's serial port without
using a modem. Once the PC is connected, the connection is effectively the same as a
remote dial in connection.
Enable null modem dial-in on the SnapGear unit
Configure dial-in on the SnapGear unit as your would for a regular remote dial-in
connection, including adding a user name and password if so desired. This is described
in detail in the Dial-in section of the chapter entitled Network Setup.
Select Advanced from the System section of the main menu, select the Configuration
Files tab, check options.ttyS0 and click Modify.
Remove the following line:
connect '/bin/chat -f /etc/config/chat.ttyS0'
Add the following line to the bottom of the file:
passive
Connect the null modem cable
Connect the SG's serial port directly to the serial port on the local PC using a null modem
serial cable.
Enable null modem dialout of the local PC
The following instructions are for Windows XP.
Click Start > (Settings >) Control Panel > Network Connections and select Create
new connection from the Network Tasks menu on the left hand side. Click Next.
Appendix F – Null Modem Administration
Appendix F – Null Modem
Administration
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