Firewalls

After several  security  related internet  newsgroups  started overflowing  with posts it becomes  clear something  hand to done to help  secure  networks. The first  firewalls were implemented in routers between  different  segment s of the network. These  firewalls  were basically ACLs in routers.

Slowly  firewall technology  started  to evolve. Early firewall  technology  known as packet filtering was not enough to stop the constant attacks. The  firewall had to  more intelligent  and understand  the different  protocols.