Ansible uses ad-hoc to perform tasks
In the previous article I installed Ansible on Ubuntu, in this article I will discuss how to use Ansible. There are two ways for Ansible to perform tasks, ad-hoc and playbook. Here I will...
Author: Haifeng
Install Ansible on Ubuntu
The installation environment is Ubuntu 19.10. Upgrade packages Install Ansible Verification ansible.cfg: This is the ansible configuration file.hosts: The hosts file includes the device information( IP address, etc.). Documentation Installing Ansible on Ubuntu https://docs.ansible.com/ansible/latest/installation_guide/intro_installation.html#installing-ansible-on-ubuntu
Configure keepalives to prevent putty automatically disconnecting
I often need to open multiple putty sessions. When I need to use it again after a while, sometimes putty has been automatically disconnected. This has troubled me for a long time, and now...
Configure network with netplan on Ubuntu
I installed new Ubuntu 19.10 server and realized that I need to use netplan to configure the network. The following is my configuration. Configure the IP address and DNS Configure proxy Save configuration We...
ax-udl: Cisco Wireless Syntax Highlight Rules for Notepad++
Notepad++ is often used in my work, mainly for analyzing logs. If I can mark some important content in advance, it will greatly improve my work efficiency. So I started the ax-udl project, which...
Collect debug logs on Cisco Catalyst 9800 Series Wireless Controller
I am learning C9800 series wireless controller recently. For someone (me) who is familiar with AireOS, everything is new. I sorted out the steps – how to collect debug on C9800. First, we need...
No valid user found, please configure a valid user from Controller
If you are using Cisco Catalyst 9800 Series Wireless Controller, you may not be able to log in to the AP after AP Join and the following error message appears. Probably for security reasons,...
Configure 802.1X on 9800 series WLC and ISE
1. Configure AAA Add the ISE address to the 9800 WLC. Configure Server Groups (optional, not required). Configure AAA Method (required), If not configured, authentication will fail, which will be discussed in 6. Verification....
Configure PSK authentication on Cisco Catalyst 9800 Series Wireless Controller
1. Configure WLAN Add WLAN in Configuration> Tags & Profiles> WLANs and configure PSK. Don’t forget to change Status to ENABLED. 2. Configure location Add location, you can also use the existing location. Configure...
Embedded Event Manager simple example
EEM can be used for monitoring, or triggered by specified conditions (change configuration, etc.). The following is Cisco official document. Embedded Event Manager (EEM) is a distributed and customized approach to event detection and...
Configure guestshell on Cisco CSR 1000V
1. Enable IOx 2. Confirm IOx status We can see IOx service (IOxman): Not Ready. This may take a few minutes. 3. Configure port If the port is not configured correctly, the following error...
Upgrade a Cisco Catalyst 9800 Series Wireless Controller
1. Delete old installation files install remove inactive 2. Copy files from ftp server to flash memory copy ftp://username:password@image flash: 3. Confirm copied file dir flash:*.bin 4. Install to bootflash install add file bootflash:image...
Initially configure a Cisco Catalyst 9800 Series Wireless Controller
The following is the initial configuration process of C9800-80-K9. 1. Configure IP address and default route Updated on November 5, 2020Or configure the IP address in the port instead of SVI 2. Configure SSH...
Tips for saving teraterm logs
In the previous article I shared how to save putty logs, this time I will share how to save Tera Term logs automatically. Setup – Additional settings Set directory and file name For the...
Tips for saving putty logs
Admittedly, putty is a good tool. I often need to copy the putty logs to a txt file for analysis. I would like to share here two tips for using putty. Let putty output...
Configure color theme for putty
For network engineers, you may use putty every day at work. Some people who are willing to share have made the putty color theme, and we only need to download it to easily configure...
How to configure Splash Page Redirect (WLC + ISE)
In this post I will show how to configure Splash Page Redirect. The logic of Splash Page Redirect is to use 802.1X for identity authentication. When the authenticated user tries to access the webpage,...
How to Decrypt WPA packet with Wireshark
When troubleshooting wireless issues, we often need to analyze OTA packets. The annoying thing is that most of these packets are encrypted, and we can’t see the contents inside. Fortunately, we can use Wireshark...
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