At 11:02 10/22/2003, webmaster wrote: > >"192.168.0.1/28" "WhiteList=1" > >This subnetting art confuses me.. What am I actually doing here?
That particular subnet designation would whitelist 8 addresses from 192.168.0.0 - 192.168.0.15 You can look at it this way - IP addresses are, underneath everything, 32-bit addresses. The /xx designation indicates how many of those 32 bits are significant. /4 = look at only the first 4 bits /8 = look at only the first 8 bits (first byte - normal class A address space) /12 = look at only the first 12 bits /16 = look at only the first 16 bits (two bytes - normal class B address space) /24 = look at only the first 24 bits (three bytes - normal class C address space) /28 = look at only the first 28 bits /32 = look at *all* the bits So, using 192.168.0.1 as an example, 192.168.0.1/4 = 192.0.0.0 - 207.255.255.255 192.168.0.1/8 = 192.0.0.0 - 192.255.255.255 192.168.0.1/12 = 192.160.0.0 - 192.175.255.255 192.168.0.1/16 = 192.168.0.0 - 192.168.255.255 192.168.0.1/24 = 192.168.0.0 - 192.168.0.255 192.168.0.1/28 = 192.068.0.0 - 192.168.0.15 192.168.0.1/32 = 192.168.0.1 You can specify any number of bits after the slash, although some places use only 4, 8, 12, 16, 20, 24, 28, and 32. - To unsubscribe from this list: send the line "unsubscribe xmail" in the body of a message to [EMAIL PROTECTED] For general help: send the line "help" in the body of a message to [EMAIL PROTECTED]
