| In a security valued unit, always separate the intranet and internet to ensure the security. But some intranet users may break the rules and connect to the internet either through Dialup or other ways. Hackers may attack the host and then visit the intranet, steal the confidential information and paralyze the whole network through the illegal connection. For it is through Dialup or other links, but not through firewall, firewall can do nothing to this kind of attack. Visit other hosts of the intranet through this host can behave as a valid user, and IDS will not discover and alarm. Most of the security products can do nothing to this confidential and easily omitted security weakness.As a effective technology method, the technology of monitoring on illegal external link can monitor any kind of illegal external link manners of the whole intranet generally and timely. The thesis does... |
