Question:

If I have a ip range 10.1.1.1 - 10.1.1.252. Would I use the following range 10.1.0.1 - 10.1.255.254 in my ip scope on my DHCP server.

Jdavis37,

What subnet mask are you using?

How many clients will need to obtain IP address from this DHCP server?


Patty

No.  You only have 250 addresses according to the numbers.  What you have described is 65533 addresses.  Your numbers (10.1.1.1 - 10.1.1.252) would indicate that the 10.X.X.X network is subnetted down to a 255.255.255.0; or, you have a only been allocated the 10.1.1.0 network.  

Is your subnet mask 255.255.255.0?

Bob

No, this is a class A address so my subnet is 255.0.0.0 and if I borrow any bits it should be 255.255.0.0

Yes, No and True.  You can borrow way more bits if you wanted.  I was refering to the numbers that you gave.  

Anyway, to answer your question, you would use 10.1.1.1 - 10.1.1.254 if you wanted 250 addresses to be used out of the 10.1.0.0 network.

Hope this helps.

Bob

Thanks!

Thanks again, Bob

I need at least 600 - 700 ip's using a class A ip address. Starting with 10.1.1. How can I set this range up for my DHCP server and what would my subnet mask be?

Thanks

If I were you, I'd use 10.1.1.1 - 10.1.3.254 with a subnet mask of 255.255.252.0, which would give you 1022 valid IP addresses.

//Daniel

Thanks

I used the range below: But I'm only getting 678 ip's. Is the subnet mask 255.255.252.0 correct? Should it be 255.255.0.0..Should this give me more network then host.



If I were you, I'd use 10.1.1.1 - 10.1.3.254 with a subnet mask of 255.255.252.0, which would give you 1022 valid IP addresses.

Also, from that range..what would be my network id?

Your network ID would be 10.1.0.0, subnet mask 255.255.252.0.  This is going to create problems for you unless your router supports "ip subnet zero" routing.  This will give 1022 addresses, with 10.1.0.1 as your first address and 10.1.3.254 as your last address.

If you want to be safe use 10.1.4.0 255.255.252.0.  This will put you in the first real usable subnet when subnetting.  

BTW--
How many users are on a single segment?  It is great to have a large range of addresses to choose from, but, the more users, the more broadcasts.  This can have real impact on the network.  

Bob

Usse this free calculator to determine your net and sub.  This is free and easy to use.  just enter the net id and subnet mask desired and it will give you the net id, first usable address, last usable address, and broadcast address.

Bob

http://www.wildpackets.com/products/ipsubnetcalculator

I see your other posting.  How many do addresses do you need?  

If you need 200-300 use 10.1.2.0 255.255.254.0

If you need 600-700 use 10.1.4.0 255.255.252.0

Bob