> For the complete documentation index, see [llms.txt](https://ezr24.outdoorrouter.xyz/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ezr24.outdoorrouter.xyz/manual/4-advanced.md).

# 4 Advanced

- [4.1 Internet & IP](https://ezr24.outdoorrouter.xyz/manual/4-advanced/internet-ip.md): Run a first quick Internet access test to check Internet connectivity.
- [Changing Web Port](https://ezr24.outdoorrouter.xyz/manual/4-advanced/internet-ip/changing-web-port.md): Guidance of how to change the Web GUI interface port on the EZR23 router.
- [4.2 Firewall Settings](https://ezr24.outdoorrouter.xyz/manual/4-advanced/4.2-firewall-settings.md): The router firewall controls the forward packet streams from incoming network interfaces to outgoing network interfaces.
- [4.3 Dynamic DNS](https://ezr24.outdoorrouter.xyz/manual/4-advanced/4.3-dynamic-dns.md): Dynamic DNS allows that your router can be reached with a fixed hostname while having a dynamically changing IP address.
- [4.4 Traversal Cloud](https://ezr24.outdoorrouter.xyz/manual/4-advanced/4.4-traversal-cloud.md): Traversal Cloud is a secure NAT tunnel tool to provide remote control function on the 4G outdoor routers and connected hosts.
- [4.5 Command-line](https://ezr24.outdoorrouter.xyz/manual/4-advanced/4.5-command-line.md): The command-line interface (CLI) means interacting with the router system where the user issues command to the router system in the form of command lines.
- [4.6 Bootloader](https://ezr24.outdoorrouter.xyz/manual/4-advanced/4.6-bootloader.md): Rescue the EZR24 router from the "brick" mode.