KERN -> Core Settings VM -> Virtual Memory VFS -> File System NET -> Network Settings Debug-> Debug HW -> Hardware Information USER -> User Information Kern.SecureLevel Security Level Default to -1 can be -1,0, 1, 2 can be changed by the bottom to high NET.INET.IP.TTTTTTL value for default survival time is 64Net.inet.tcp.syncookies syscookies settings defaults 1, using syncookienet.inet.tcp.log-in-vel = 1NET . Inet.udp.log-in-Vain = 1 Outside the port closing server No port kern.ps_showallprocs = 0 Ordinary users cannot view all processes
