BGP (Border Gateway Protocol) is the routing protocol of the Internet, and because of the […]
Point-to-Point GRE VPN Tunnel on Cisco Devices
GRE VPN is not a good VPN Tunneling technology and this is just a reference […]
NAT type Port Address Translation (PAT) on Cisco Devices
There are 3 types of NAT: Static NAT – Translates a private to a public […]
Setting Up a Headless Raspberry Pi + SSH + VNC + WiFi
The following steps will work in any Raspberry Pi with Raspbian (now called Raspberry Pi […]
Using SCP and RSYNC for Copying and Syncing
Both SCP and RSYNC, use SSH Protocol as a way to transfer files and directories. […]
Working with ACLs on Cisco Devices
An ACL is a list of rules that can be applied to an interface to […]
VSFTPD + TLS + Fail2Ban on Ubuntu
Assuming you already have an SSL/TLS key that you may have created for your HTTP […]
Using MSMTP with Google SMTP Relay on Ubuntu
This SMTP application works the same way on Raspbian 10 (Buster). sudo apt-get install msmtp […]
Changing Prompt Color on Bash Terminal
There is no technical reason to change the color of the terminal console, but anyone […]
SPF + DKIM + DMARC Overview
Tools against SPAM and domain spoofing: SPF – Whitelist of hosts that are allowed to […]