diff --git a/README.md b/README.md
index d65983d..4d19a7a 100644
--- a/README.md
+++ b/README.md
@@ -7,6 +7,7 @@
 * [Containers](https://git.netig.net/netig/chimera-linux/src/branch/main/containers.md)
 * [UFW configuration](https://git.netig.net/netig/chimera-linux/src/branch/main/ufw-config.md)
 * [HostUp VPS network configuration](https://git.netig.net/netig/chimera-linux/src/branch/main/hostup-network-config.md)
+* [Network tricks](https://git.netig.net/netig/chimera-linux/src/branch/main/network-tricks.md)
 
 ## Project links
 
diff --git a/network-tricks.md b/network-tricks.md
new file mode 100644
index 0000000..da36d11
--- /dev/null
+++ b/network-tricks.md
@@ -0,0 +1,18 @@
+# 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>
+```