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nixos/modules/services/networking/gns3-server.md

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+# GNS3 Server {#module-services-gns3-server}
+
+[GNS3](https://www.gns3.com/), a network software emulator.
+
+## Basic Usage {#module-services-gns3-server-basic-usage}
+
+A minimal configuration looks like this:
+
+```nix
+{
+  services.gns3-server = {
+    enable = true;
+
+    auth = {
+      enable = true;
+      user = "gns3";
+      passwordFile = "/var/lib/secrets/gns3_password";
+    };
+
+    ssl = {
+      enable = true;
+      certFile = "/var/lib/gns3/ssl/cert.pem";
+      keyFile = "/var/lib/gns3/ssl/key.pem";
+    };
+
+    dynamips.enable = true;
+    ubridge.enable = true;
+    vpcs.enable = true;
+  };
+}
+```