Access machines connected to router from machine connected to hub

I have a DSL modem connected to a Linux firewall.
The Linux firewall and numerous other machines are connected to a 100MB hub.
This configuration has worked fine for many years.
I purchased a Linksys WRT54GS for the wireless & 10/100 switch capabilities. I have the Linksys connected to the hub via the hub's uplink port. I have one wired and one wireless machine (both Windows) accessing the Internet just fine via the Linksys. I can ping a Linux development machine connected to the hub from one of the Windows machines connected to the Linksys. However, I cannot ping the wired Windows machine (has static IP address) nor the Linksys itself. I am unsure if the Linksys is not responding to pings & not allowing them to go through to the connected machine, or, if I need to modify my firewall/gateway somehow.
Any thoughts would be appreciated!
Thank you kindly!

Thanks for the reply! I am just now getting back to this as it dropped in priority for a while. My development box(es) on the hub is in the range of 192.168.3.x and the DHCP server on the Linksys WRT54GS dole out 192.168.4.x. I am thinking I need a route configured either on the Linksys or my Linux gateway - does this make sense?
Thank you!

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Access machines connected to router from machine connected to hub

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