On Fri, Dec 19, 2008 at 02:40:47AM +0000, l l9l wrote:
However, what I am really wondering is what is the most standard subnet length that always can be guaranteed through Internet. less than /24 bit ?
while one can get away w/ /24s (if that is all one has) for many places, I suspect that there will be increasing pressure to drop more specific /24s as folks routing tables grow. your question, "...length that can be guaranteed through the Internet." argues for fairly short netmasks, e.g. a /16 is likley to be accepted by most folks while very short masks, e.g. /8 or smaller are likly to be seen with some level of consideration since so very few prefixes of that size are likely to be origin-sourced (often proxy aggregates from transit parties)... as others have pointed out - this "acceptable" value is fluid, changing over time and variable between ISPs. Creating a static policy is likely to be flawed. --bill (crawling out from under his rock, blinking in the bright lights)