2/5/2024 0 Comments Install asa in gns3![]() In the previous article, we deploy the FortiGate Firewall in VMWare Workstation. In this session, we are going to configure our Cisco ASA firewall using Telnet.In this article, we will deploy the FortiGate Next-Generation Virtual Firewall directly in GNS3. 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. Private: 49152 to 65 535 ( Also, known as dynamic Ports ).Well Known: From 0-1023 ( used by commonly used protocols.Internet Assigned Numbers Authority manages all port numbers and protocols. Ports have three types Well Knows, Registered, and Private. ![]() So, whenever, a user requests services from servers, their system itself adds a source port number and destination port number. In computer Networking, Ports are a virtual path from source to destination. Ports and protocols, both play an essential role in networking. Human beings, usually use domain names instead of IP addresses, because they can easily remember and understand domain names like “ “, in comparison to IP address 104.31.89.207. We have DNS (Domain Name Server), which converts, IP addresses to Domain Name. In this world, every small computer, networking device, and server has a unique IP address. We have two types of IP addresses one is IPv4 the other is IPv6. ![]() The IP address plays a vital role in networking. To know the firewall in detail, we must first understand how networking works. If the packet is marked as allowed in the firewall policies list then it can cross the Firewall, otherwise, the firewall drops that packet. In firewalls, we have to write Inbound and Outbound rules, every packet that tries to cross the boundary (Inbound to Outbound or Outbound to inbound), is first checked by the written policies. ![]() Firewall behaviors always depend upon written policies. However, we have to write policies on both of them. ![]() Software Firewall is software that can be installed in other operating systems like Windows, Linux, and MAC. Hardware firewalls have separate hardware with their Operating System, CPU, RAM, and different types of interfaces (ports). Firewalls have two types, the first one is Hardware Firewalls and another one is Software firewalls. A firewall is a network security system that controls and monitors incoming and outgoing network traffic. ![]()
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