Global Technology Associates SOFTWARE FIREWALL GBWA200501-01 사용자 설명서

 

4 – Troubleshooting 39

GTA Support recommends the following guidelines as a starting point when 
troubleshooting network problems:

•  Start with the simplest case of locally attached hosts.
•  Use IP addresses, not names. Your problem could be DNS.
•  Work with one network segment at a time. 
•  Verify your firewall system configuration by using Verify Configuration. 

The verification check is the best method of ensuring that your sys-
tem is configured correctly. Correct all errors and warnings listed.

•  Your first tests should be connectivity tests. Ping and traceroute are 

very useful tools for testing connectivity.

•  Make sure the network cabling is connected to the correct network 

interface. Some useful guidelines are:

•  Verify the network interface numbers, MAC addresses and 

logical names listed on the Network Information screen and in the 
Configuration Report.

•  Use the logical elimination method. Connect a network cable 

to the first network interface and use the ping facility to test for 
connectivity with a host on the desired network. If unsuccess-
ful, move the cable to the next network interface and perform 
the test again. Repeat until successful, or all network interfaces 
have been tested.

•  Generate a Configuration Report. Check the report to ensure all 

your network devices have been recognized by the system at 
boot time.

This is usually a routing problem. The traceroute facility can be very useful in 
debugging routing problems. Check for these problems:

•  Are the hosts that can’t reach the Internet on a different network 

subnet from the firewall?