# Advanced

- [Firewall](https://ezr33t.router.works/advanced/firewall.md): The router firewall controls the forward packet streams from incoming network interfaces to outgoing network interfaces.
- [Dynamic DNS](https://ezr33t.router.works/advanced/ddns.md): Dynamic DNS allows the router to reach a fixed hostname while having a dynamically changing IP address.
- [Traversal Cloud](https://ezr33t.router.works/advanced/traversal-cloud.md): Traversal Cloud is a secure NAT tunnel tool to provide remote control function on the 4G outdoor routers and connected hosts.
- [Terminal](https://ezr33t.router.works/advanced/terminal.md): The command-line interface (CLI) means interacting with the router system where the user issues commands to the router system through command lines.
- [Web Port](https://ezr33t.router.works/advanced/web-port.md): Guidance of how to change the Web GUI interface port on the outdoor router.
- [VPN Tunnels](https://ezr33t.router.works/advanced/vpn-tunnels.md): The outdoor router has integrated both OpenVPN and WireGuard protocols.


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# Agent Instructions: Querying This Documentation

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Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
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```

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Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.