Liu eighth sermon tonight, although there is a firewall software or hardware of the points, but the main features are based on the policy of traffic through a firewall to filter itself. Firewall policy may be based on information on the source and destination address of the traffic, port number, protocol, application, etc. to customize, then firewall pre-customized policy rules to monitor traffic and out, when the flow rate matches a one policy rule, corresponding processing is executed, otherwise discarded. In this way, you can ensure that only legitimate traffic between the corporate network and the outside public network flow. The main content of the course is four NIC configuration method, iptables (not test) you can understand, the work need to query, firewall-cmd command (graphical firewall-config tomorrow, talking about the effect is the same)
old Liu Website: linuxprobe.com
-------------------------------------------------- --------------------------------------- Marco Aberdeen