More IP's need on internal network

Networking/Security Forums -> Networking

Author: Chickendog PostPosted: Fri Sep 16, 2011 10:15 pm    Post subject: More IP's need on internal network
I am a subnetmasking dumby.

My current internal network is 10.0.1.x with a subnet mask of

I am running out of IP's on this network. I have sonicwall firewall that i think i can uses as a router but am not 100 percent sure. I could setup multiple networks to reduce the traffic and seperate servers from users. Or I could put a router in between the firewall and the users and servers.

What is the general rule of thumb when you run out of IP's on simple network?

Thanks for your reading time.

Author: AdamVLocation: Leeds, UK PostPosted: Sun Sep 18, 2011 5:26 pm    Post subject:
No routing required, just make your subnet bigger.

Change your subnet mask to so you get 65,534 hosts instead of 254 - each unique combination of the last two octets (8-bit binary 'groups' / decimal digits in an IP address) will then be a unique host on your 10.0.x.x network.

Obviously do this with lots of caution and sense checking first, make sure your existing routers are reconfigured to handle this before changing any DHCP scopes etc.

10.0.1.x (aka is just one sub-network of 10.0.x.x (aka, so all you are doing really is moving the boundary outwards to a bigger range while leaving the existing IPs in place. You can then change your DHCP and static addresses to suit you.

You may want to use some addresses for specific purposes to make life easier while everything is still in a single subnet eg:
10.0.1.x = servers and network devices
10.0.2.x = printers and other static IPs
10.0.10.x - 10.0.20.x = DHCP clients

Author: capiLocation: Portugal PostPosted: Wed Sep 21, 2011 1:58 pm    Post subject:
To compliment AvamV's good advice, you may find the following primer of help in understanding subnetting:
Subnetting Chart (Good for Exams)

Author: PhiBerLocation: Your MBR PostPosted: Tue Oct 18, 2011 6:02 am    Post subject:
And in this day and age, here is a great subnet calculator to do the work for you . Wink

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