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Best way to subnet small site

CiscoPurpleBelt
Frequent Contributor
Frequent Contributor

Let's say I have to use the 192.168.X.X address space for numerous sites.

I would like to correspond the 3rd octet to the site but still separate different traffic for the site - maybe separate for 4-5 different teams/departments. I don't want things to get out of flow or have problems let's say if these sites began to expand or double in size. 

Does  let's say using /28, then /26, etc. subnets sound like the best approach if I must use 192.168?

5 Replies 5

Spooster IT Services
Rising star
Rising star

Hi CiscoBlueBelt,

 

It all depends on the machines you have in each department and chances of expansion. I would recommend using 192.168.x.x/23 for the bigger site and 192.168.x.x/24 for smaller sites. Then equally divide the subnet further department wise.

 

For example, use 192.168.0.0/23 and you have four departments at this site then divide the subnet as follow:

192.168.0.0/25

192.168.0.128/25

192.168.1.0/25

192.168.1.128/25

I think 126 usable IP's are enough for each department.

  

Spooster IT Services Team

Basically, as of now I would like to correspond the 3 Octet in the 192.168.X to the site. This would leave me to only be able to break up the 4th octect correct?

Correct.

Spooster IT Services Team

mlund
Rising star
Rising star

Hi

I see You have stated you must use 192.168 this is private space. Is there a reason you can't use 10.x..x.x instead?

Because with 10 space you can do 10.<department>.<site>.<user>

/Mikael

CiscoPurpleBelt
Frequent Contributor
Frequent Contributor
Yes, lab assignment is to do it with 192.168 unfortunately.
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