IPTV and Internet separating

Hi, my provider uses 10.10.29.0 to manage settopboxes and gives them by dhcp address. So they use a little switch before POE client to separate the bandwidth to set-top-boxes. For this switch i receive also on ether1 by PPOE my internet.
I want to make second Bridge like IPTV and to user ether4 and ether5 for set-top-boxes in two rooms, but i want they to be able to get from ether1/wan/ dhcp of the provider.
Any ideas?
Regards:
Stefan