added ss

sheets/ss

@@ -0,0 +1,25 @@
+# Utility to investigate sockets
+#
+# Options:
+#   -4/-6   list ipv4/ipv6 sockets
+#   -n      numeric addresses instead of hostnames
+#   -l      list listing sockets
+#   -u/-t/-x list udp/tcp/unix sockets
+#   -p      Show process(es) that using socket
+
+# show all listening tcp sockets including the corresponding process
+ss -tlp
+
+# show all sockets connecting to 192.168.2.1 on port 80
+ss -t dst 192.168.2.1:80
+
+# show all ssh related connection
+# documentation on the filter synax: sudo apt-get install iproute2-doc
+ss -t state established '( dport = :ssh or sport = :ssh )'
+
+# Display timer information
+ss -tn -o
+
+# Filtering connections by tcp state
+ss -t4 state established
+