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Supernetting an existing network

Hi,

I have a network 192.168.1.0 /25. This network's use has ballooned and I only have 4 addresses left to give out. I would like to change it to 192.168.1.0 /23 (to go from 126 addresses to 510). Here are my steps :

1. Change the firewall interfaces for 192.168.1.0 to the new subnet (as the firewall also does the routing between networks).
2. Change the servers subnet masks from /25 to /23 as time permits (during this time all /25 hosts should be able to communicate without issue correct ? They will have to change to /23 subnet inorder to communicate with new nodes in the new parts of this subnet correct ?).
3. I do not run any routing protocols like RIP or OSPF (everything is static), so no biggie there.

Am I oversimplifying things ? Is there anything I am missing ?

Thanks

SOLUTION

macoronat

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SOLUTION

Ernie Beek

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Jan Bacher

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pwindell

No everything is not fine. Ethernet should not have subnets beyond 250-300 Hosts. Rolling back the mask by just one bit jumps it to 510,...then next bit jumps to 1022. Someone my argue that 350-400 won't hurt performance but 510 is too much.

For every 200 Hosts create a new subnet. All it takes is the addition of a simple LAN Router. If a company can afford to have a network larger than 200 machines then there is no way they can argue that they can not afford a simple LAN Router.