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=== using aliases ===Aliases can be defined for use with different blocking methods. In the single illustrated example above, an alias could be used to replace either the source or destination IP address. An alias can be used to define a host which may have multiple associated IP addressses like a group of workstations or an Internet destination where a DNS may resolve to more than one host. An alias could also be used to create a list of hosts which are unrelated other than you wish for them to be blocked. If a rule were added for each host to block individually, the rules list would grow quite large. By adding all of these hosts to an alias, only one firewall rule is necessary.