GB-750 Firewall Appliance Product Guide18 4 – Troubleshooting 19
4 Troubleshooting
Guidelines
GTA Support recommends the following guidelines as a starting point when
troubleshooting network problems:
1. Start with the simplest case of locally attached hosts.
2. Use IP numbers, not names. Your problem could be DNS.
3. Work with one network segment at a time.
4. Verify your system conguration. The verication check is the best
method of ensuring that your system is congured correctly. Correct
all errors and warnings listed.
5. Your rst tests should be connectivity tests. Ping and Traceroute are
very useful tools for testing connectivity.
6. Make sure the network cabling is connected to the correct network
interface. Some useful guidelines are:
• In a GB-750, the port/NIC numbers, MAC addresses and logical
names are listed on the Network Information screen and in the
Conguration Report.
• Use the trial and error method. Connect one network cable and
use the ping facility to reach a host on the desired network. Move
the cable and use ping until you are successful. Connect the next
network cable and perform the test again with the two remaining
network interface cards.
• Generate a hardware report from one of the user interfaces.
Check the report to ensure all your network devices have been
recognized by the system at boot time.
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