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- Advanced Firewall Troubleshooting
This chapter has focused primarily on the core tasks of a firewall to process traffic
through the firewall and for the firewall to provide for connectivity and access to remote
and protected hosts. However, firewalls continue to gain more advanced features and
functions, and it is becoming necessary to troubleshoot those advanced features and
functions.
Processes such as SNMP, NTP, routing, and authentication all provide ample opportunity
for something to fail that you will need to troubleshoot, diagnose, and repair. The key to
troubleshooting these advanced features relies on you undertaking a couple of steps:
Step 1. Ensure that you understand the process in question and how it functions. For
example, if the firewall is going to use NTP, make sure that you know how
NTP functions so that you know how to begin troubleshooting any problems
that may occur.
Step 2. Develop troubleshooting checklists that are relevant to the processes and
functions in question. For example, although most of the generic firewall
troubleshooting checklist steps may be relevant, if you need to troubleshoot
SNMP, you need to consider SNMP-specific troubleshooting steps to
complement the standard troubleshooting checklist that you will adhere to.
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