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Increasing DHCP IP addresses to an existing LAN

Hi,

I have a LAN with the IP scheme 192.168.5.x connected via MPLS and VPN to multiple other physical sites with individual subnets 192.168.1.x, 192.168.2.x, 192.168.3.x and 192.168.4.x. Subnet mask is 255.255.255.0 for all.

I need to increase available DHCP addresses of just the 5.x network, and allow the other subnets to continue to communicate with IPs on the 5.x network.

Is it better to:

1) change the subnet mask on 5.x to 255.255.255.254? I believe that will then increase the available DHCP to include 192.168.6.x range as well. Correct?

or

2) Set up a separate 6.x network and tie it into the 5.x (and other subnets) using a router?

I would prefer the first option, but will that have an effect on traffic speed across the LAN and the WAN? Will the 6.x addresses be able to communicate with 1.x and 2.x etc...? Or does it require a routing scheme update on the Cisco site to site routers?

Thanks,

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rauenpc

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cfgchiran

ASKER

Thank you for the comment. Why is it not possible to extend 5.1-6.255 with a subnet change? (By making it 192.168.5.0/23)?

Thanks,

cfgchiran

ASKER

And yes, I meant 255.255.254.0. :) Thanks.

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rauenpc

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cfgchiran

ASKER

Thank you again.

I have always had some trouble following this binary, and have tried to read up on it on-line just now as well.

I think the part that's confusing for me is if 192.168.4.0/23 192.168.6.0/23 gives you a range of 4.0-5.255 and 6.0-7.255 respectively, why doesn't the same option work for 192.168.5.0/23?

If we were to say 192.168.10/23 would it not be 192.168.1.0-192.168.2.255?

cfgchiran

ASKER

I meant 192.168.1.0/23

cfgchiran

ASKER

I just used a subnet calculator and I actually do understand it better. So thank you for your help.