There are measures that can be taken to protect users from objectionable or
inappropriate Internet content and secure the LAN from theft, modification, or deletion
of data. Firewall is one of many security measures that can be used to protect networks.
Although firewalls are powerful, they suffer from many types of attacks.
This paper concentrates on one particular aspect, which is providing firewalls
security against five types of attacks. These attacks are: SYN Flooding, Ping of Death,
IP Address Spoofing, Impersonate one-half of a Session and Session Hijacking. This
can be done by building a specific strategy for a firewall; a strategy that has three
procedures, some of which could be stood for more than one attack.