Cisco ASA Firewall Packet Tracer for Network Troubleshooting
One of the most useful troubleshooting features of Cisco ASA firewalls is to use the “packet-tracer” command to trace and simulate how a packet will traverse through the ASA appliance in order to identify possible problems (such as why a packet is blocked etc).
With the “packet-tracer” command it is possible to trace the lifespan of a packet through the security appliance to see if it is behaving as expected.
The packet-tracer command lets you do the following:
- Debug all packet drops in production network.
- Verify the configuration is working as intended.
- Show all rules applicable to a packet along with the CLI lines which caused the rule addition.
- Show a time line of packet changes in a data path.
- Inject tracer packets into the data path.
The packet-tracer command provides detailed information about the packets and how they are processed by the security appliance.
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