Gibraltar is a Debian-based firewall package which is bootable directly from a CD-ROM, so hard disk installation is not necessary. The configuration data is optionally stored on a hard disk, floppy disk or USB storage device. Gibraltar was specifically developed for small to medium-size enterprises and fulfils all demands for an up-to-date firewall package. In times where the threats of viruses, worms, trojan horses or hackers are increasing rapidly, Gibraltar offers an extensive protection of internet connections. Besides a commercial release of Gibraltar a free edition is also available.