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03.25.2008 at 09:46AM PDT, ID: 23267652
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subnet question

If I am given the private ip of 10.18.x.x for myself to use in a network..

Can I further subnet that subnet into 10.18.21.x, 10.18.22.x ?

And maybe even going into the 4th octed to create smaller subnets?
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Question Stats
Zone: Networking
Question Asked By: njcomp3
Solution Provided By: MrHusy
Participating Experts: 3
Solution Grade: A
Views: 0
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03.25.2008 at 09:48AM PDT, ID: 21203663

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03.25.2008 at 04:07PM PDT, ID: 21207322

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03.25.2008 at 09:07PM PDT, ID: 21208817

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03.26.2008 at 08:16AM PDT, ID: 21212528

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03.26.2008 at 08:19AM PDT, ID: 21212562

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03.26.2008 at 12:14PM PDT, ID: 21215136

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03.25.2008 at 09:48AM PDT, ID: 21203663
Hi njcomp3
   Sure you can. What is the given subnetmask fo 10.18.x.x ?

Regards
Assisted Solution
 
03.25.2008 at 04:07PM PDT, ID: 21207322
Absolutely. The private ip range 10.x.x.x is a class A IP address range. That means there are over 4 million address in that range... **GASP**. If you have been 'given'  10.18.x.x, you probably have a subnet mask like 255.255.0.0. Depending on the hardware you have, subnetting that further could  be very easy. In your example, I am assuming you want  to have two different LANs with 256 possible nodes. (well exept for 0 and 255, those are usually unusable,  so 254) Your new subnet mask would look like 255.255.255.0. If you needed  more that 254 in each, you could structure your subnet a little differently, like 255.255.254.0. That one extra bit doubles your available network nodes. Under that subnet mask, you could have networks like 10.18.20.0/23 and 10.18.22.0/23. Did you notice how I skipped  "21"? That's where the other 256 nodes came from. Keep in mind that subnetting in the fourth octet really starts to crimp the number of addresses you can use. It is a great way of maximizing your usage between small networks like router to router links.

Let us know your hardware configuration and maybe we can help a  little further.

Good Luck
 
03.25.2008 at 09:07PM PDT, ID: 21208817

Rank: Master

You could even go a little crazy like this ...

10.18.21.0/25 126 hosts
10.18.21.128/26 62 hosts
10.18.21.192/27 30 hosts
10.18.21.224/28 14 hosts
10.18.21.240/29 6 hosts
10.18.21.248/30 2 hosts
Assisted Solution
 
03.26.2008 at 08:16AM PDT, ID: 21212528
Great thx!!...So there would be no issue if you had different subnet masks...as stated abve
 
03.26.2008 at 08:19AM PDT, ID: 21212562

Rank: Master

As long as you're careful and don't overlap space.
Assisted Solution
 
03.26.2008 at 12:14PM PDT, ID: 21215136
"Great thx!!...So there would be no issue if you had different subnet masks."
   Thats correct. But you will need a router or an OS with routing capabilities to be able to communicate between subnets
Accepted Solution
 
 
03.26.2008 at 06:30PM PDT, ID: 21217905
thx everyone
 
 
 
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