Category Archives: Firewalls

Adding RBLs to your Paloalto Networks Firewall

A quick way to add Dynamic External Lists to your Paloalto firewall via cli is as follows. login to your firewall via SSH. type configure and paste the below set external-list tor-threats type ip url recurring hourly set external-list spamhaus-drop type ip url recurring hourly set external-list spamhaus-edrop type ip url recurring… Read More »

How STP selects the root bridge

In an STP enabled LAN, a switch is designated as the root bridge. The root bridge serves as an admin point for all spanning-tree calculations to determine which redundant links are blocked. An election process takes place, determining which switch becomes the root bridge. Each switch has a Bridge ID (BID) that is made up of: priority value extended system… Read More »