As i said, last day of the holidays... Anyway so i put my address in as 192.168.1. 40 with a subnet of 255.255.255.240 "it" (being the tcpip stack of X favourite OS) will know im refering to the block 192.168.1.32 thru 192.168.1.47 ok thats pretty cool when i make my route however, what is the network?? (or -net x.x.x.x ) Dean Howard Lowndes wrote: > > With a netmask of .240 then your last block is any block of 16 IPs on a 16 > block boundary, ie. > > 192.168.1.0 thru 192.168.1.15 or > 192.168.1.16 thru 192.168.1.31 or > 192.168.1.32 thru 192.168.1.47 or > 192.168.1.48 thru 192.168.1.63 etc. You get the idea, always remembering > that the first and last IP in the block you define is unusable as a host > address. > > In the example you quote then your block is wrong because the address > 192.168.0.15 would be in the first 16 address subnet whereas the address > 192.168.0.30 would be in the next 16 address subnet, so your range would > be: > 192.169.0.16 - network address > 192.168.0.17 thru 192.168.0.30 - useable host adresses > 192.168.0.31 - broadcast address > > You have to subnet on boundaries that are a power of 2. > > -- > Howard. > ______________________________________________________ > LANNet Computing Associates <http://www.lannet.com.au> > > On Mon, 17 Jul 2000, Dean Hamstead wrote: > > > > > > > > > > > And its that simple, in a subnet with a mask of 255.255.255.240, you have > > > > 15 available addresses. BUT. Remever, with IP addressing the lowest > > > > address (all 0's in the host space) is the network address (identifies the > > > > subnet) and the highest address (all 1's in the host space) is the > > > > broadcast address. So you only really have 13 addresses that you can use > > > > for your actual hosts in the subnet. > > > > > > You actually have 16 addresses in this range, with 14 useable. IP > > > numbering starts from ZERO - in other words, ZERO is a valid IP address - > > > so your range is from 0 to 15 - with 0 being the network address, and 15 > > > being the broadcast address. > > > > when you use a subnet like 255.255.255.240 which 14 address's can be > > used? > > with 255.255.255.0 is all 255 in the last byte, eg 192.168.0.x > > > > with 255.255.255.240 is it the last 14 address's? > > can i use it to take a chunk from the middle? > > eg. 192.168.0.15 - 30? > > > > Dean > > > > > > > > -- > SLUG - Sydney Linux User Group Mailing List - http://slug.org.au/ > More Info: http://slug.org.au/lists/listinfo/slug -- BONG: http://www.bong.com.au EMAIL... [EMAIL PROTECTED] [EMAIL PROTECTED] [EMAIL PROTECTED] [EMAIL PROTECTED] ICQ: 16867613 -- SLUG - Sydney Linux User Group Mailing List - http://slug.org.au/ More Info: http://slug.org.au/lists/listinfo/slug
