Now that the hardware side of things is clarified, let's move back to the software side.Įventually, you might have to install additional drivers packaged with the USB-to-RS232 cable or install generic drivers for the application. Some of our smaller firewalls have an RJ-45 console connection instead of the RS232-connection and have console cables within the packaging content:īelow you can see a picture of both an RS232 console port, mostly prominent on professional firewall and switch hardware, as well as the RJ-45 on our small business routers (such as a USG20W, e.g.): Use a USB-to-RS232 connector-cable (also known as 'serial connection' or 'SUB-D 9-pol') and connect to your PC as well as to the router - the serial cable should look like this In this tutorial, we will use puTTY for SSH and TeraTerm for console connection.ĭisclaimer: We have no affiliation with neither puTTY nor TeraTerm and showcase the use of these programs for demonstration and learning purposes - use of these applications happen at your own risk. You can either use a terminal console software such as PuTTY or TeraTerm. Table of Content 1) Using the Console Cableġ.2 CLI-access via Console Cable (using TeraTerm)ġ.3 CLI-access via Web GUI (Web Interface)ġ.4 What devices will these methods work on?ġ.5 What can I do with the CLI? 2) Debug the Firewall after Reboot/Crash Issuesġ) Using the Console Cable 1.1 The Software This guide will give you great insight into how to access your Zyxel device's CLI (Command Line Interface). The command-line interface is a management interface that can be reached via several ways, including SSH and serial cable/console cable connection. It shows what console cable to use, how to login and gain console access via Putty & TeraTerm, access Web GUI CLI, and how to use the debug level 8 command for troubleshooting reboot/crash issues/problem.

This article shows how to use the CLI/Command line interface via console cable using USG FLEX, a VPN firewall, an XGS-Switch or even a professional access point like a WAX510D.

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