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<td width="20%">[[Updating Ubuntu Linux|Previous]]<td align="center">[[Ubuntu Linux Essentials|Table of Contents]]<td width="20%" align="right">[[Using Firestarter to Configure an Ubuntu Linux Firewall|Next]]</td>
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<td width="20%">Updating Ubuntu Linux<td align="center"><td width="20%" align="right">Using Firestarter to Configure an Ubuntu Linux Firewall
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A firewall is a vital component in protecting a computer system, or network of computers from external attack (typically from an internet connection). Any computer connected directly to an internet connection must run a firewall to protect against malicious activity. Similarly, any internal network must have some form of firewall between it and an external internet connection.
