防火墙常见问题（Firewall FAQ）.doc

防火墙常见问题（Firewall FAQ） SCREENOS question In general, the OS Juniper firewall equipment failure phenomenon, but also some of the OS because in the process of using improper, here are a few upgraded from OS failure phenomenon caused by improper, and share. Phenomenon 1: The firewall in a specific time every day of the crash, much like a beyond the scientific explanation of the problem, a little like haunted, but the actual situation is just a customer OS upgrade, the selected version of OS can not guarantee the safety of its source, also can not guarantee the OS loss in the process of transmission. After the upgrade, the equipment starts normally, in the detection process found the lack of some operating commands, such as: unset all command, with the manufacturers to engineers, the conclusion is that this command does not exist version difference, namely: all versions contain this command, so that OS upgrade properly, re download the latest OS in the Juniper site, and upgrades, several days after, no similar problems, troubleshooting. Summary: the source of unknown OS, as well as the instability of the line during the upgrade process, will lead to the application of OS, OS upgrade caused by improper problems most, the problem is also the most strange. Phenomenon 2: After the use of firewall configuration, after a period of time, suddenly found that the firewall can not manage and login, and at the same time, PING can not pass. After the inspection found that the configuration of the firewall firewall is to take wings to itself, to restore the factory, re allocation after running for several days, the stability will appear, understand the customers application, customers usually found in each evening the firewalls power off, and the devices used by customers is not independent of the power switch in the low-end products eliminates human operation leads to problems, we suspect that related to OS, therefore, update OS, and remind the user, the firewall power does not need