Shulou(Shulou.com)06/01 Report--

[original translation] packet capture of PIX/ASA

User's guide

Enable packet capture by attaching an interface option keyword to capture. Capturing multiple interfaces requires multiple capture statements. Packets must be filtered through Ethernet and access lists before they can be stored in the capture buffer.

Useful capture commands:

The no capture command with the optional access-list or interface keyword clears the corresponding capture.

No capture without an optional keyword removes the capture.

If you specify the access-list optional keyword, the access list is removed from the capture and the capture is retained. If the interface keyword is specified, the capture is detached from the specified interface and retained.

The clearcapture capture_name command clears the capture buffer. Note: the capture command is not saved in the configuration and does not repeat itself on alternate settings during failover.

For more detailed capture commands, refer to the customer documentation for capture commands.

Configuration example

Capture packets passing through internal and external interfac

Step # 1-capture packets that pass through the inside interface

Access-list capture_in permit host A host B

Access-list capture_in permit host B host A

Capture inside access-list capture_in interface inside

Step # 2-capture packets passing through the external interface

Access-list capture_out permit host A hostB

Access-list capture_out permit host B hostA

Capture outside access-list capture_out interface outside

Get a packet from the device

Option # 1-browse through WEB from PIX/ASA to get files in pcap format.

Step # 1-if the http service is not available, use the "http" command to enable http (s)

Step # 2-then open a browser and type

Https:///capture//pcap

You will be prompted to save the file after connecting to ASA. For example,

Https://172.16.171.49/capture/inside/pcap

Option # 2-send pcap format files from ASA to tftp server

Step # 1-start the tftp application and set the tftp file root directory for receiving files

Step # 2-then enter the following command copy / pcap capture:t ftp:///temp on ASA. For example:

Copy / pcapcapture: inside t ftp://172.16.89.8/temp copy / pcapcapture:outside t ftp://172.16.89.8/temp

View the capture buffer on PIX

If the name of the packet capture is specified, its contents can be seen in the capture buffer. Show capture to view the capture.

Reset and delete capture commands to clear the capture buffer enter the following clear capture command

Delete the capture command:

Clear capture inside

Clear capture outside

Don't forget to delete the capture list after you finish the capture

No capture inside

No capture outside

No access-list capture_inno access-list capture_out

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