Using iptables 9.8.3. TOS Bit Manipulation 9.9.1. Setting the TOS Bits Using ipfwadm or ipchains 9.9.2. Setting the TOS Bits Using iptables 9.10. Testing a Firewall Configuration 9.11.
Security is increasingly important for companies and individuals alike.
The Internet has provided them with a powerful tool to distribute information about themselves and obtain information from others, but it has also exposed them to dangers that they have previously been exempt from. Computer crime, information theft, and malicious damage are all potential dangers. An unauthorized and unscrupulous person who gains access to a computer system may guess system passwords or exploit the bugs and idiosyncratic behavior of certain programs to obtain a working account on that machine. Once they are able to log in to the machine, they may have access to information that may be damaging, such as commercially sensitive information like marketing plans, new project details, or customer information databases. Damaging or modifying this type of data can cause severe setbacks to the company.