Wednesday, December 15, 2010

I never knew you could get tcpdump files from an ASA

I never knew you could get tcpdump-format files from a cisco ASA. Very cool!

The capture process is the same, but then stop the capture with the command "no capture $CAPNAME interface $INTERFACE" instead of "no capture $CAPNAME". Then you can go to the ASA's web site and find the file in "http://$FIREWALL/capture/$CAPNAME/pcap"

Download it and then you're good to open it with tcpdump or wireshark or whatever your packet capture viewer of choice is.

It doesn't look like there's a way to tftp it rather than turning on the ASA's http server for the duration of the download.

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Regis has worked as a network engineer since 1994 for small companies and for large companies.