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This is useful when the local machine where you need to do the packet capture with tcpdump doesn?t have enough room to save the file, where as your remote host does
tcpdump -i eth0 -w - | ssh savelocation.com -c arcfour,blowfish-cbc -C -p 50005 "cat - > /tmp/eth0.pcap"
Your @ PC1 doing a tcpdump of PC1s eth0 interface and its going to save the output @ PC2 who is called save.location.com to a file /tmp/ppp1-to-me.pcap.gz again on PC2
More info @: http://www.kossboss.com/linuxtcpdump1
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