Lets take a quick look at the test capture and see if we are getting any bytes ASA(config)#show captureĬapture test type raw access-list test interface inside circular-buffer Along with Packet Tracer this has to be one of the best trouble shooting tools in the ASA arsenal. Lets create a simple test capture to capture traffic coming from a single host on the inside with a simple ACL.Ĭreating A Simple Packet Capture ASA#configure terminalĪSA(config)# access-list test permit ip host 192.168.254.15 anyĪSA(config)# capture test interface inside access-list test circular-buffer Ok well enough about the Accelerated Security Path, and on to Packet Captures.
Performing Layer 3, and Layer 4 header checks. Using NAT / XLAT translations based on existing Session Management. Establishing sessions for the Fast Path. The following is a brief overview of the Accelerated Security Path or ASP process. It’s worth mentioning or at that vary least talking a little bit about the ASP as it relates to the overall flow or the beginning of the flow as packets inter the ingress interface either outside, inside or dmz interfaces on the ASA. Real Time : Display captured packets in real-time. Packet Length : Configure maximum length to save from each packet. Match : Capture packets matching five-tuple. Interface : Capture packets on a specific interface inside, outside or dmz. Headers only : Capture only L2, 元 and L4 headers of packets. Ethernet type : Capture Ethernet packets of a particular type. Buffer : Configure the size of capture buffer, default is 512 KB. ACL : Capture packets that match a specific access-list. Whether its the act of troubleshooting connectivity problems through the Firewall or simply watching suspicious traffic Another powerful feature is the ability to create multiple packet captures and watching them in real time or simply downloading them, and analyzing them with your favorite packet capture utility. The ability to capture packets in real time without consuming a large amount of resources on the Firewall is incredibly powerful. Along with the Packet Tracer this may simply be one of the most powerful troubleshooting tools in the Firewall arsenal. I believe that Cisco introduced the ability to capture packets in or around version 7.x of the PIX/ASA platforms as well as the FWSM.
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