This is not the case at all. Forged e-mail addresses can not be stopped. The operating system and the firewall can only respond this type of hack. The firewall can not tell if the Reply To is forged if it is from a previously valid e-mail address. Modems provide a hidden threat to the host or network through hidden border crossing by going around the firewall.
Modems provide users the means to dial out on their own to the Internet going around the firewall.
ISPs for the host using the modem may be accessible by unauthorized users who can exploit the modem breach in the firewall. Finally most users do not realize that all IP connections are a security risk. The more connections to the Internet, the greater the risk of being breached. In today s connectivity environment, firewalls are one more necessary bit of the security system to be understood. Future columns will cover specific hardware and software firewalls.