Long time no diary, especially about the technology. So much so that they forget that they are a technical person, long-term chores, document processing, relationship coordination, and get exhausted. Man Ah, can not forggestting, let alone is the person who likes technology. Installed a Windows Server 2012 to play, found that the effect is really good, especially on the handling of the load, rarely hear the sound of fans. But found a problem, in the office of the Internet, open the Web page, always wait 2-3 seconds to display the content of the page, but after going home there is no such a problem. Toss all day, various repair, various changes, firewall, drive, Group Policy, MTU, TTL, all kinds of not. I want to pack a Wireshark grasp the packet analysis, but found WinPcap not fit, pit dad. I was thinking, is the server system for this reason? No solution was found on the Internet, even the person who raised the question did not see it. Still have to grab packet analysis, installed a Microsoft Network Manager, Microsoft's own clutch tool, finally worked. Analysis of TCP packets, found in the unit, each open a webpage, will first send a number of TCP ECN (explicit congestion notification) packets to the target, and then wait 2-3 seconds, and then the target 3 times to establish a TCP connection, but at home did not send a TCP ECN packet. Windows Server 2012 turned on the ECN feature by default (which appears to be turned on by default after Windows Server 2008), but the personal operating system was not turned on, and the office network was indeed congested, resulting in this effect. OK, after executing the "netsh int tcp set global ecn=disable" command, be decisive OK. Reference: http://technet.microsoft.com/zh-cn/bb726965
Windows Server 2012 If you open a webpage slow download fast Then
