How toResubnet 192.168.0.0 255.255.255.0

May 18, 2014 at 17:39:08
Specs: Cisco/Windows
I need to re-subnet corporate Lan as we are out of IP addresses. Our router connected networks are:
192.168.0.0 255.255.255.0 corporate
192.168.1.0 255.255.255.0 branch
192.168.2.0 255.255.255.0 branch 2
192.168.3.0 255.255.255.0 branch 3
192.168.4.0 255.255.255.0 branch 4
If i change corporate router to 192.168.0.1 255.255.254.0 wont I have to change my other routers to that same mask?
Thank you for your help.

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#1
May 18, 2014 at 23:49:03
Why not just add 192.168.5.0 with subnet mask 255.255.255.0?

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#2
May 19, 2014 at 06:27:04
Do you mean add 192.168.5.0 as an addtional subnet for corporate 192.168.0.0?
If so, would I create an addtional scope in DHCP and then add a route in the router?
Thank you for the help

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#3
May 19, 2014 at 07:52:58
192.168.0.0/23 gives you the following network:

192.168.0.1 to 192.168.1.254

Do you see any conflict with your existing network?

What ijack is suggesting is to simply add another network (ie: 192.168.5.0/24)

Changing your existing "corporate" network the way you're suggesting might work if the corporate is completely segmented from all other branch networks. If however, they're not separate, then you can't do it and your best bet would be to add another network.

I have to ask, and I do not mean to be rude but, your questions make me think you have little to no experience with networking. If that is the case, you might want to hire a competent consultant to come in and get you setup so you know it's done correctly.

It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.

***William Henley***


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#4
May 19, 2014 at 08:46:51
You can't just add a subnet or the result is x.x.0.x and x.x.5.x will not talk to each other when on the same lan unless you put a router in between. That gets messy on a lan.

You can't supernet the corporate lan since it will conflict with the branch.

But why get stuck? You can make the corp any ip range you want. Like how about 172.16.0.0?
Or pic something like 192.168.100.0 /23 ?

You have to go around and change those ips that are static to be in the new range but pretty simple all in all.

Answers are only as good as the information you provide.
How to properly post a question:
Sorry no tech support via PM's


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