Block IP addresses by Country in 3CX
You may want to block the login or phone registration by IP address in 3CX if you are sure your […]
Automate Jobs on Cisco Device
There are multiple ways you can automate the work on cisco device ( Router, Switch ), Kron is one of […]
Postfix With Dovecot
Enter the following command to see the FQDN form of your hostname. hostname -f If your CentOS/RHEL server doesn’t […]
MDNS causing campus global network outage
Recently, I have some network issue across the whole school. All the computer will get offline and then fix themselves. […]
Cisco PPTP VPN
R1(config)# conf t R1(config)# username aaron secret MyPassword Now we need to activate aaa new model to expose new commands: […]
UDLD Unidirectional Link Detection
UDLD (unidirectional link detection) is a supplementary protocol to Spanning tree protocol at Data link layer, before introducing UDLD, let’s […]
Configure DHCP server on a MAC
This guide is intended to show you how to provide an IP address to an Atlona unit whose NIC (network […]
Configure Cisco unified border element (CUBE) gateway 2
Configure CUBE Protocol Interworking Command To enable protocol interworking, use the allow-connections from-type to to-type command in voice service […]