diff --git a/.obsidian/workspace b/.obsidian/workspace
index f1f226e..aa016c1 100644
--- a/.obsidian/workspace
+++ b/.obsidian/workspace
@@ -9,7 +9,7 @@
         "state": {
           "type": "markdown",
           "state": {
-            "file": "School/Analyse/ICMP.md",
+            "file": "School/Analyse/NAT.md",
             "mode": "source"
           }
         }
@@ -68,7 +68,7 @@
             "state": {
               "type": "backlink",
               "state": {
-                "file": "School/Analyse/ICMP.md",
+                "file": "School/Analyse/NAT.md",
                 "collapseAll": false,
                 "extraContext": false,
                 "sortOrder": "alphabetical",
@@ -87,6 +87,7 @@
   },
   "active": "bc6e8ad9aa0f44c3",
   "lastOpenFiles": [
+    "School/Analyse/NAT.md",
     "School/Analyse/ICMP.md",
     "School/Analyse/DHCP.md",
     "School/Analyse/IPV4.md",
@@ -95,7 +96,6 @@
     "School/Analyse/Layers/5. Session Layer.md",
     "School/Analyse/ARP Protocol.md",
     "packet-enscapsulation-2.png",
-    "packet-encapsulation.png",
-    "School/Analyse/Network Software.md"
+    "packet-encapsulation.png"
   ]
 }
\ No newline at end of file
diff --git a/School/Analyse/ICMP.md b/School/Analyse/ICMP.md
index 62a7b4c..e638ce2 100644
--- a/School/Analyse/ICMP.md
+++ b/School/Analyse/ICMP.md
@@ -6,4 +6,8 @@ In case of errors, the sender needs:
 2. Make corrections in the message.
 3. Retry sending the message.
 
-ICMP Protocol is responsible for sendn
\ No newline at end of file
+ICMP Protocol is responsible for sending error messages.
+ICMP Messages are used to verify the status of the network.
+
+![[example-icmp.png]]
+
diff --git a/School/Analyse/NAT.md b/School/Analyse/NAT.md
new file mode 100644
index 0000000..43934a6
--- /dev/null
+++ b/School/Analyse/NAT.md
@@ -0,0 +1,4 @@
+# Network Address Translation
+We can share one global IP using NAT.
+
+- All mem
\ No newline at end of file
diff --git a/example-icmp.png b/example-icmp.png
new file mode 100644
index 0000000..3f4f40d
Binary files /dev/null and b/example-icmp.png differ