The missing uptime explained
It seems that my box loses its uptime record after I have migrated it to the Yizhuang IDC. The two things are related, but technically speaking, they are not. Actually I have discovered gokeeper’s hosts losed their uptimes as well, but I did not know why before. Sometimes I thought that was because the Linksys switch we have used, but there are some evidence that it is not; also I have at a point doubted the Cisco devices were misconfigured or have some firewalling features, but that’s not the answell, either.