How LAN problems impact on firewalls
Last week seems to have been a firewall issue week for me. I worked on incidents in two large networks where problems on the LAN managed to bring down firewalls at the edge of the network. Firewalls have come a long way since the original stateless varieties, which were little more than a collection of access control lists. These were superseded by stateful firewalls which kept track of the state of network connections. Modern firewalls are now application aware, you can do things like block access to certain applications or prevent users from using applications like Bittorrent.
Read the full article on my ComputerWorld blog