troubleshooting Question

Network Supernetting/Subnetting Change

Avatar of Timothy Kashin
Timothy KashinFlag for United States of America asked on
Hardware FirewallsInternet Protocols
19 Comments1 Solution1141 ViewsLast Modified:
So I have a situation that I inherited and I am not quite sure how to successfully perform this subnet change.

I recently (2 months ago) started a new job as network admin for a small company going through a growth spurt.  The existing network is a 192.168.1.0/24 subnet which has become too small.  I would like to change this to a 192.168.1.0/22 subnet with minimal interruption to the network.  Here is the caveat to this whole process.  The routing of the network is being handled by a Cisco Pix 506e, currently addressed at 192.168.1.1.  Technically I should be able to change the subnet mask on all the devices to make this work, but, what change do I need to make in the PIX to route these extra addresses?  Route Add statement?

I want to keep the existing servers/printers on the 192.168.1.xx segment while moving DHCP to 192.168.2.x and VOIP to 192.168.3.x and thereby leaving 192.168.4.x for future expansion.  Feel free to call me an idiot if I have this wrong, but I feel it's got to be something simple.  Yes, I realize it's old equipment that needs to be changed out but being a small company it's baby steps to get that new ASA device and Switches =)

Thanks for any help that can be offered in advance......
ASKER CERTIFIED SOLUTION
rauenpc
Senior Network Speialist

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