Adding tcpdump page

common/tcpdump.md

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+# tcpdump
+
+> Dump traffic on a network
+
+- capture the traffic of a specific interface
+
+`tcpdump -i {{eth0}}`
+
+- capture all TCP traffic showing contents (ASCII) in console
+
+`tcpdump -A tcp`
+
+- capture the traffic from or to a host
+
+`tcpdump host www.example.com`
+
+- capture the traffic from a specific interface, source, destination and port
+
+`tcpdump -i {{eth0}} src {{192.168.1.1}} dest {{192.168.1.2}} and port 80`
+
+- capture the traffic of a network
+
+`tcpdump net {{192.168.1.0/24}}`
+