Extend IP Addresses

I have a client that needs to extend the number of IP addresses for their guest wireless, on Sundays they have more than 250 people trying to connect to it. They would like to have as many as 800 available IP's. Is it as simple as changing the subnet from 255.255.255.0 to 255.255.0.0 ?
They currently have a Linksys WRT610N router which is connected to the main router with a VLAN connection. Because of the physical layout it would be very difficult to add another router.
I have told them that it's likely with 800 connected they won't have bandwidth to do anything but they want to try it anyway.
Thanks.
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dpachecoAsked:
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Jakob DigranesConnect With a Mentor Senior ConsultantCommented:
I'd recommend using a 22 mask instead of 16 - as you probably won't need 65 000+ addresses

use this mask:
255.255.252.0 instead - will gove you 1022 addresses.
It could be wise to exclude 192.168.4.255, 192.168.5.0, 192.168.5.255, 192.168.6.0 and so forth as they MIGHT get you into problem (Brodacast (.255) and network address (.0) )

you can get you address here: http://www.subnet-calculator.com/subnet.php?net_class=B
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akhalighiConnect With a Mentor Commented:
I wish you had more details about infrastructure ..

if this range is only being used for guest network ; it should be okay to extend with the mask change . If you have a corresponding interface on your main router that talks to wireless router ; you need to change the mask on that interface as well.

Also the rule on the router that performs NAT ; needs to be updated .
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dpachecoAuthor Commented:
The guest wireless is cabled to a port on the main router, that port designated as a VLAN. The guest wireless then has WAN IP set to automatic and a LAN IP of 192.168.5.1.

What other details would help?
Thanks.
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dpachecoAuthor Commented:
Exactly how would I enter this in the router? My local IP is 192.168.1.1 and I can only enter a starting IP address which must be 192.168.1.x and the number of users.
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Jakob DigranesSenior ConsultantCommented:
What router do you have?
some routers/firewall (small business versions) might have limitations to how large subnet you can create.

But you can try to enter 192.168.1.1 and 1000 users - might give you a network from 192.168.1.0 to 192.168.168.4.255 --- subnetmask 255.255.252.0
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dpachecoAuthor Commented:
I was finally able to look at the router today, it does not allow me to enter more than 253 in the number of users and I cannot change the third octet of the subnet mask.
I'm wondering if you have any suggestions for a wireless router that would be able to allow more IP's?  Thanks.
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Jakob DigranesSenior ConsultantCommented:
Well--- you should look at some enterprise solutions then. How many users regularly? and what use do you expect?
Should the firewall serve as a "simple" router just doing NAT and occasional port blocking, or do you intend to add anti-virus or UTM on firewall?

what budget do you have?
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dpachecoAuthor Commented:
They are saying 1,000 users but only on Sundays or events, this is a church. It only needs to be a simple router, no anti-virus or UTM. Not much of a budget, I'd say less than $200.
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dpachecoAuthor Commented:
I could not do this with the existing router but both gave good answers I believe so I'm splitting the points.
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