Linksys Router preventing webmail

Here is the problem..
I have guests on my network..
All they require is an Internet connection which is provided through a linksys router..
Of course the router has an assigned address from dhcp but the router itself is assigning the guest 192.168.x.x
addresses which I think is preventing the users from connection to their exchange server...

When the users attempt to browse to their web mail it simply hangs...

Other then dropping switch in the conference room - how can I configure the router to just be a Wireless access point and assign
ip addresses from the exsisting network
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just have the router stop acting as a DHCP and let the domain server assign them their IPs
Rodney BarnhardtServer AdministratorCommented:
My first question is this same Linksys router used for your entire company? We did something similar for guest, but had it sitting in a DMZ, behind a Juniper firewall. There had to be rule and policies to allow this to work through the firewall. If you simply want it as an access point, the use the instructions in this link:
You didn't specify which model you are using.  

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AemiliusAuthor Commented:
Great Thank You
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