On Fri, 2009-01-09 at 21:07 -0700, Craig White wrote: > On Sat, 2009-01-10 at 12:59 +1100, Simon Slater wrote: > > On Fri, 2009-01-09 at 16:56 -0800, Rick Stevens wrote: > > > > > No, the /24 covers EITHER 192.168.0.xxx or 192.168.1.xxx, but not both. > > > To treat both as a single network you need a /23 netmask. > > > > > > A netmask tells the system how many bits of the network address make up > > > the NETWORK part. > > > > This is where my misunderstanding was. > > > > > The remaining bits make up the host identifier. An > > > IPV4 address is 32 bits. A /24 (or 255.255.255.0) netmask says the > > > first 24 bits (the first three octets) make up the network part. > > > > What then, is a sub-net? > > > > > In my > > > graphic below, the netmask stuff is shown in by "x"s and the bits under > > > the "x"s make up the network address: > > > > > > netmask: xxxxxxxx.xxxxxxxx.xxxxxxxx.-------- (255.255.255.0 /24) > > > binary addr: 11000000.10101000.00000000.00000001 (192.168.0.1) > > > binary addr: 11000000.10101000.00000001.00000001 (192.168.1.1) > > > > > > So you can see that they're separate networks. Now, with a /23 netmask: > > > > > > netmask: xxxxxxxx.xxxxxxxx.xxxxxxx-.-------- (255.255.254.0 /23) > > > binary addr: 11000000.10101000.00000000.00000001 (192.168.0.1) > > > binary addr: 11000000.10101000.00000001.00000001 (192.168.1.1) > > > > > > You can see here that they're the same network now, and you're using 9 > > > bits as the host identifier. > > > > Okay, for a small private network of up to 2 dozen boxes, is there a > > standard or convention for selecting the final numbering system, eg > > 192.168.0.101 to 125 vs 192.168.9.1 to 25 ? Is there a need to > > distinguish between computer,printer or router in the numbering > > heirarchy? > > > > > > Also note that the netmask must be consecutive 1 bits...the first 0 bit > > > marks the end of the netmask. 255.255.254.0 is OK (the last octet is > > > 11111110 binary), but 255.255.253.0 isn't (the last octet is 11111101) > > > and would be treated the same as 255.255.255.252 (a /22 or 11111100). > > > > > > Does it make sense now? > > > > Getting there! > ---- > small network is less than 254 devices (routers, printers, computers, > servers, etc.)...should just be a class C network (subnet mask > 255.255.255.0) > > 192.168.0.1 through 192.168.0.254 > > typically routers would be either top or bottom... > 192.168.0.1 or 192.168.0.254 > > My own typical setup... > > router 192.168.x.254 > > servers > 192.168.x.1 through 192.168.x.19 > > printers > 192.168.x.20 through 192.168.x.39 > > vpn/other > 192.168.x.80 through 192.168.x.99 > > computers (dhcp) > 192.168.x.100 through 192.168.x.199 > > miscellaneous devices (cameras, managed switches, etc.) > 192.168.x.200 through 192.168.x.253 > > Craig > Thanks, these are the sort of guides I was after. -- Hooroo, Simon Registered Linux User #463789. Be counted at: http://counter.li.org/ -- fedora-list mailing list fedora-list@xxxxxxxxxx To unsubscribe: https://www.redhat.com/mailman/listinfo/fedora-list Guidelines: http://fedoraproject.org/wiki/Communicate/MailingListGuidelines
