How to install Infoblox free IPAM Express on CentOS7
IP address management is one of annoying thing need to be done by network admin. Especially, small network or decent size of lab environment. Here…
Cisco CME Basic Setup and Troubleshooting Tips
Cisco Call Manager Express(CME) or Cisco Unified Call Manager Express(CUCME) is one of popular VoIP solution in the mid-size voice of IP telephony market. This…
How to fix Cisco FXO Voice Card Disconnect issue
How to fix Cisco FXO Voice Card Disconnect issue Recently, I was working on setting up PSTN/POTS line at international office. On Cisco 2921 router,…
Cisco CME T1/E1 PRI configuration and Troubleshooting
It is a basic guide for install and configuring T1/E1 module on Cisco Unified Call manager Express(CME). Also, it will have some troubleshooting tips and…
Cisco ICMP Redirection Behavior and Tips.
If you have old network design like route-on-a-stick although L3 switch was present. Basically, all Switch Virtual Interfaces(SVIs) for the VLANs are on the router….
How to install IPAM on Windows Server 2012 R2 and Tips
Well, Look below video clips.
Why Tenable/NESSUS requires full level 15 access for Cisco devices? Don’t need it.
It is a long battle between vulnerability scanner vendors and network engineers to allow level 15 access privilege from the scanner. Since it is common…
List of free SMS gateware from US cell service provider
AT&T: [your number]@txt.att.net MetroPCS: [your number]@mymetropcs.com Nextel: [your number]@messaging.nextel.com Sprint: [your number]@messaging.sprintpcs.com OR [your number]@pm.sprint.com T-Mobile: [your number]@tmomail.net Verizon: [your number]@vtext.com Virgin Mobile: [your number]@vmobl.com…
Splunk install and Tips on CentOS7
Add data to Splunk A. Splunk server 1. Click “Add data“2. Click “A file or directory of files”3. “Consume any file on this Splunk server”,…
SSL/TSL Encryption and certificate 101
Good site to understand how SSL works~ SSL/TSL handshark There are many tutorials and video how to SSL/TLS HTTPS protocol is working, but below video is…
How to install Certificate Authority on Windows 2012 R2
Prerequisites 1. Create an account / CertAdmin with Domain Admin and Enterprise Admins Group privilege The account must belong to the local Administrators group for below…
How to install a certificate for PRTG server
Generate a CSR 1. Download and install OpenSSL (Windows version) at PRTG server. 2. Generate CSR for Microsoft CA C:\OpenSSL-Win32\bin>openssl req -nodes –newkey rsa:2048 –keyout…
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