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Outpost Firewall Versie 4.0 Manual

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4.6 DNS Cache
The Internet works by assigning a series of numbers to each computer connected to it. This
is called the computer’s IP address. An example of an IP address is: 64.176.127.178. You
can simply type in this series of numbers into your browser’s location field (near the top of
your browser’s window) and press your keyboard’s Enter key and your browser will go to
that computer’s web pages.
Although these numerical IP addresses are easy for a computer to use, they are difficult for
us humans to remember. So an address system was invented that uses words or letters
called the DNS (Domain Name System). A DNS name is what you are probably more
familiar with than IP numbers. An example of a DNS name is:
www.agnitum.com.
DNS names are much easier for us to remember, but our browsers still need to use the IP
address to find and transfer files on the Internet. Therefore, there are databases throughout
the Internet that keep track of what IP address goes with what DNS name. To find the IP
address that corresponds to a DNS name, sometimes your browser has to consult several
different databases located at different places on the Internet and this often takes time.
To speed things up, Outpost Firewall provides a personalized look-up table of DNS
addresses on your own computer. This is called a domain name cache and you can
customize it however you like.
Outpost Firewall maintains the DNS cache automatically within your specifications to
include those addresses that are most recently used by you. The amount of time that a DNS
address is saved in the DNS cache depends on the time you specify as one of the settings
for this plug-in. It also depends on how many DNS names you want Outpost Firewall to
keep track of. Only the most recently used names are kept up to the maximum number of
entries you specify.
Make sure the Enable DNS caching is selected on the plug-in’s shortcut menu for Outpost
Firewall to provide this speed up.
To modify the settings of the DNS Cache plug-in, select Properties on the same menu.
You can limit the DNS database to a specific number of entries and have them be
automatically deleted if they are not used within a certain number of days. To not limit the
database to only those entries that are used within a certain number of days, clear the DNS
records expire check box.
To enhance your system security, DNS Cache plug-in blocks invalid or malformed DNS
requests that might cause system crash or serve as an exploit of a DNS backdoor. Select
Verify and block malformed DNS requests option to have DNS Cache plug-in block
these requests so that an attacker or a malicious program would not have chance to exploit
DNS flaws in your system. Also, you can set to block extra long DNS requests, which can
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