ã€Practice of training】
(1) Understand the meaning of firewall configuration.
(2) Master the design method of filtering rules.
(3) Master a method of using firewall personal edition. ã€
ã€Preliminary knowledge】
It is very important to define a perfect filtering rule. The filtering rules are usually given in the form of a table, arranged in order, and each row includes matching conditions and action sequences. Whenever a packet is received, it is compared with the conditions of each row in the table in the order from front to back until the conditions of a certain row are met, and then the corresponding action (forward or discard) is performed.
ã€Practical training requirements】
(1) A company has a class B address of 123.45.0.0, and it does not want other sites on the Internet to access it. But the company has a subnet of 123.45.6.0 for the development of cooperation projects with a university. The university has a class B address of 135.79.0.0, and hopes that each subnet of the university can access the 123.45.6.0 subnet, but not other subnets. Try to design filtering rules.
(2) Use of "Skynet Firewall Personal Edition".
[Practical training steps]
1. Design filtering rules
The filtering rules are shown in the table below.
rule | source address | Destination address | action |
A | 135.79.0.0 | 123.45.6.0 | allow |
B | 135.79.0.0 | 123.45.0.0 | Forbid |
C | 0.0.0.0 | 0.0.0.0 | Forbid |
The meaning of 3 rules, 0.0.0.0 represents any address, rule C is the default rule, rule B is redundant, because rule C contains rule B. It can be optimized as follows:
rule | source address | Destination address | action |
A | 135.79.0.0 | 123.45.6.0 | allow |
C | 0.0.0.0 | 0.0.0.0 | Forbid |
2. Use of Skynet Firewall Personal Edition
(1 Introduction.
Skynet Firewall Personal Edition is a network security program used by personal computers. It guards the network according to the security rules set by the administrator and provides powerful access control, information filtering and other functions to resist network intrusions and attacks and prevent information leakage. Skynet firewall divides the network into local network and Internet, and can set different security schemes for information from different networks, which is suitable for users who access the Internet in any way. Its main functions are as follows.
1) Strict real-time monitoring.
2) Flexible security rules.
3) Application rules settings.
4) Detailed access records and perfect alarm system.
5) Instant chat protection function.
After entering the installation program, you must first select the installation path. The default installation path of Skynet Firewall Personal Edition is C: \ Program Files \ SkyNet \ FireWall folder. You can also set the installation path by clicking the "Browse" button.
After setting the installation path, the program will prompt to establish the location of the shortcut toolbar of the program group, just select "Next".
If you are still not sure whether all the programs have been completely closed, you can also select "Cancel" during the installation process, just select "Exit".
If you continue the installation, the next step is a process of copying files. After copying the files, the system will prompt you to reactivate the computer. The installed Skynet Firewall Personal Edition program will take effect.
After the program is copied, the installer will call up the firewall setup wizard to help users set up the firewall properly. Users can follow it to set up firewall rules suitable for their use step by step.
Finally, just restart the computer as prompted. The operation interface of Skynet Firewall Personal Edition is shown in Figure 7-1.
Figure 7-1
4. When registering for the first time to execute Skynet Firewall Personal Edition, a registration code window will pop up, fill in the firewall serial number registration code according to the instructions in the pop-up window.
The method of obtaining the registration code is that users only need to go to Skynet Firewall Personal Edition website for membership registration. After registering and logging in, the website will automatically go to the personal edition forum, and then the user's registration code will be displayed in the forum's toolbar. In addition, users can also directly click the connection of the registration prompt box to go to the personal version of the firewall for member registration.
After successful registration, you can run Skynet Firewall Personal Edition normally. Skynet Firewall Personal Edition will automatically shrink to a small icon in the taskbar after execution.
Electronic Air Purifier,Air Cleaner Ionizer,Pm 2.5 Air Cleaner,Air Cleaner Dust
Dongguan V1 Environmental Technology Co., Ltd. , https://www.v1airpurifier.com