Subnetting Help

[KevinO]

Ok. I just plain suck at subnetting and I wanted to ask you guys for help. I have the ip range of 10.96.48.0 /24 and want to spit it up into 4 seperate subnets if possible.

Vlan Use Subnet
1 WAN /30 (255.255.255.252)
2 Network /26 (255.255.255.192)
3 Servers /26 (255.255.255.192)
4 Printers /24 (255.255.255.128)

I really don't think there is a logical way to split it up into those subnets without overlapping at least 2 of them since the last three would take up all 254 addresses. I really don't need the servers to be a /26 due to I really don't have that many, so a /27 will do. I hope I explained myself correctly.

I would like the WAN to start 10.96.48.1, but that is the only real requirement.

 

[Tink]

subnet calculators are your friend
http://www.solarwinds.net/Tools/Free_tools/Subnet_Calc/index.htm

I know I so rarely need to do any subnetting that i always have to bust out the calc to get a good view of what i will have when all is said and done. Its so much easier than trying to work it out on paper. Just out of curiosity why\what are you subnetting?

 

[KevinO]

Converting my works old Token-Ring network to Ethernet. During this conversion we are going to new ip scheme etc.

 

[dr_debauch]

Assuming you meant the printers subnet was actually a /25...

As it stands, no, you can't do it.

Now, if you use the /27 for the Network and Server subnets, it'd look like this:

WAN: 10.96.48.0/30 (255.255.255.252)
Network: 10.96.48.32/27 (255.255.255.224)
Servers: 10.96.48.64/27
Printers: 10.96.48.128/25 (255.255.255.128)

That also leaves you with 10.96.48.4 - 10.96.48.31 unallocated and able to be used for more /30 subnets, or some other interestingly sized ones (up to a /28).

Unfortunately, you'll have to make both the network and server subnets /27, if you make one a /26 there's not enough address space left with that /30 WAN network there.