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C
Null modem administration
Contents
Null modem
Troubleshooting
Null modem
This appendix details how to enable your UTM Firewall appliance for administration from a local PC using a
null modem serial cable. This allows the local PC to dial in directly to the serial port of the appliance without
using a modem. Once the PC is connected, the connection is effectively the same as a remote dial-in
connection.
Enabling null modem dial-in
Configure dial-in on the UTM Firewall appliance as you would for a regular remote dial-in connection,
including adding a user name and password if so desired. This is described in detail in
access.
From the System menu, click Advanced > Configuration Files tab.
1
Select the edit checkbox for the options.ttyS0 file and click Modify.
2
Remove the following line:
3
connect '/bin/chat -f /etc/config/chat.ttyS0'
Add the following line to the bottom of the file:
4
passive
Click Finish.
5
Connect the serial port of the appliance directly to the serial port on the local PC using a null modem serial
6
cable. Now follow the procedure,
Enabling null modem dial out of the local PC
The following instructions are for Windows XP:
Click Start > Settings > Control Panel > Network Connections and select Create new connection
1
from the Network Tasks menu on the left hand side. Click Next.
Click Set up an advanced connection and click Next.
2
Click Connect directly to another computer and click Next.
3
Click Guest and click Next.
4
In Computer Name, enter an arbitrary name for this connection (for example, SG null modem) and click
5
Next.
From the Select device list, select the local PC's serial (COM) port to which the null modem is attached,
6
and click Next.
Click Finish. The network connection now appears under Network Connections in Control Panel
7
under the Direct heading.
McAfee UTM Firewall 4.0.4 Administration Guide
Enabling null modem dial out of the local
Setting up dial-in
PC.
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Troubleshooting
