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Block subnet access - Linksys Router

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Last Modified: 2013-12-21
I have a linksys wireless router that is connected to another, larger router. The larger router manages a few subnets.

The "large" router connects a couple PCs in my house, the Linksys router is connected to it (the WAN port of the Linksys is connected to a spare port on the larger router, and the Linksys is operating in Gateway mode)

The Linksys router has an IP address of 192.168.10.50, and has a static IP, and has internal DHCP enabled so that wireless clients get IP addresses in the range 192.167.1.150 to 192.167.1.254

I am trying to set up a rule with the "Advanced Routing" feature so that wireless clients cannot ping or otherwise try to access anything in the range
192.168.1.1 to 192.168.255.255

I have the following options available for each "advanced route" I can configure (up to 20 separate routes):
Destination LAN IP
Subnet Mask
Internet Gateway
Interface (Either Lan/Wireless, or WAN)

I am able to block off entire Class-C networks (ie: 192.168.11.1 to 192.168.11.255) by doing this:
Destination LAN IP: 192.168.11.0
Subnet Mask: 255.255.255.0
Internet Gateway: 0.0.0.0
Interface (Either Lan/Wireless, or WAN): Lan/Wireless

But I cannot get it to work for the entire "Class B" network. Essentially, I just want wireless users to be able to access the internet (I don't care if they can see eachother, AP Isolation is in place) and not touch the local subnets.
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