I dip into GNS3 every so often, (depending on what I’m working on). In this session, we are going to configure our Cisco ASA firewall using Telnet.KB ID 0000927 NOTE: THIS ARTICLE IS FOR THE OLD VERSION OF GNS3 GO HERE FOR THE NEW ONE Problem So, their configurations are also different. Cisco ASA Firewall with DMZ Firewall ConfigurationĪlthough, firewalls are manufactured by many vendors. In this picture, the Router is Inside, the Web Server is in DMZ, and the ISP is in the Outside zone. The higher the security level, the higher the trust on that side network. In the Cisco ASA firewall, we have to define a security level for each interface. People from outside the internet can access our DMZ Servers like Web Server. In the Demilitarized zone, we have our servers like Web Server and FTP Server. This zone is also known as the “World of Hackers”. In the Outside Zone, there is the Global Internet. Most of the end-users are there and working for an organization. In the Inside zone, we have various switches and routers. Just, for example, most of the time, network designers called them Inside, Outside, and Demilitarized Zone. Some common Protocols and their Port numbers are mentioned below : Serial Noįirewall Zones įirewall interfaces (ports) are always kept in various zones. Now, if we have to block a service then we have to directly block the access to that protocol port. All these protocols use ports from Well Known Ports. For example, we have protocols like FTP, DNS, HTTP, TELNET, SSH, HTTPS, etc. Protocols are the set of rules, which follow by every computer, to communicate with another computer.
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