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Trying to configure a wireless router onto a pre-existing wired network

Posted on 2006-06-30
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Last Modified: 2010-03-18
I inherited a network that has 4 servers (exchange, f/p, ISA/proxy, and terminal).  The IP Address scope is 10.x.x.x with a subnet of 255.0.0.0.  The customer is wanting to add wireless capability for the laptop users in the office.  They've purchased a Linksys WRT54GR to do this.  Like all Linksys wireless routers, this device comes with the IP Address 192.168.1.1.  This office has a T1 line, which runs into a switch, which then runs into two other switches and the servers.  All desktops in the office are then connected to one of the aforementioned switches.  I have connected a Cat5 cable from one of the switches to the Internet port on the Linksys, and then from the Linksys to my laptop.  ipconfig /all on my laptop shows an IP Address of 192.168.1.100, subnet mask 255.255.255.0, and def. gateway 192.168.1.1.  I am unable, however, to get on the internet with this setup.  When I plug my laptop straight into the switch, I can get on the internet fine.

The Linksys config page doesn't allow me to change the subnet mask to 255.0.0.0 to match the LAN's subnet mask.  I can change the IP address of the Linksys, but I don't think that is much help to me, if I can't change the subnet mask.  

How can I get this router to work in this office?  Should I just try using a WAP instead of the router?  Thanks!
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Question by:dwd4243
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Jay_Jay70 earned 750 total points
ID: 17017742
take the cat53 cable out of the internet jack and put it straight into one of the ethernet ports! configure the router to allow DHCP passthrough or relay so that DHCP comes from your router - make sure no other device has the 192.168.1.1 address and change the wireless IP if it does - away you go!
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by:dwd4243
ID: 17018240
so the wireless router should work even though it's IP is not in line with the subnet mask of the other IP's on the network?
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by:Jay_Jay70
ID: 17022035
no, you will need to change the IP of the wireless box to match that of the current network
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Author Comment

by:dwd4243
ID: 17041894
that is what i tried to do before, but the wireless router wouldn't allow me to change the subnet mask to the 255.0.0.0, which is what is configured for the LAN.  It only gives me a choice of 255.255.255.0,.128,.192,...etc.  

Wouldn't the subnet mask need to be the same as that of the other network devices?
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by:Jay_Jay70
ID: 17087012
really.....i havent seen that before - but yes, your subnet mask must be the same....can you change the lan range?
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by:dwd4243
ID: 17090580
Solution:  I figured out how to do this.   Since I could not change the subnet mask on the wireless router to reflect the 255.0.0.0 subnet mask of the LAN, I left it as 255.255.255.0, and I made the IP Address of the router 10.10.1.10.  Since the IP Address scope of the LAN is 10.x.x.x, with a subnet of 255.0.0.0, then the first octet of the IP Address is really all that has to remain a constant.  I assigned the wireless adapters in the laptops with static IP Addresses of 10.10.1.xxx, and made sure that they reflected the LAN's gateway and DNS addresses, and it worked.

Thanks for your help
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by:Jay_Jay70
ID: 17095342
well done mate, you did most of this yourself :)
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