Here is the basic set-up:
Router #1: Connects to the Internet via the WAN port, DHCP is enabled. This is part of an established network that I can not change the settings on.
Router #2 (We are adding a new network): DD-WRT firmware, with the LAN and WLAN separated to isolate the WLAN to only communicate with the HOSTS on the LAN. DHCP is enabled for not the LAN and WLAN, which are different and bridged with router #2. The HOSTS on the LAN can communicate with the internet and can hit hosts on connected to router 1 via IP address, but not host names (not a big issue, think it is a DNS issue between router 1 and router 2. A local DNS server it setup on Router 2 to resolve HOST names within router 2. Router 2 is set to gateway, if changed to Router loose internet connectivity.
Problem: Any Host connected to router 1 cannot see any host connected to router 2. I can ping router #2 from a host on router 1. I know the easy fix it to establish a routing command from router 1, pointing to router 2 but I cannot change any setting within router 1.
For testing purposes windows firewalls have been turned off.
Trying to find a solution by only making changes to router 2.