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network-tricks.md

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+# Network tricks
+
+## Check if a port is reachable
+
+On the server :
+```
+# nc -l <your_port>
+```
+
+On a client machine :
+```
+$ nc -zv <server_ip> <your_port>
+```
+
+Or to check UDP port :
+```
+$ nc -zv -u <server_ip> <your_port>
+```