Yes...It had been heavily configured by the original POS vendor to serve as the security firewall for POS processing, etc. The POS system was recently upgraded and a separate hardware firewall installed. The POS integrator now disavows support of the Cisco and basically said all I needed to be concerned with was not stepping on the Static IP's of the POS server, NIC and firewall.

Three separate VLANs were originally configured with the two in the 192.168.20 and .30 ranges set with DHCP service but the third in the 10.0 range not DHCP. I setup the office .20 VLAN on the four local ports and hidden wireless SSID for office use and .30 VLAN for the guest wireless SSID and bridged the modem [which was also previously ALSO setup as a 4 port router with DHCP]. Inter-VLAN routing is turned off to keep the office and guest networks isolated, but, again, all devices on the .20 range are sharing the same VLAN in the same DHCP address pool.

All devices are online and happy except for SONOS and I'm able to see and ping all other devices on the same VLAN.