Your ADSL modem apparently includes a router and four port switch - by adding the Belkin router, which I assume has been connected via it's WAN port to the modem, you have created two networks with different ip subnets separated by the NAT feature in the Belkin router.
This NAT feature is designed to act as a firewall (among other things) and as such will prevent communication unless you specifically configure it to permit it, which may or may not be possible depending on the feature set of the particular Belkin.
Unless you have a specific reason for wanting to have two separate networks, I would suggest you get a network hub or switch and connect it to your ADSL modem in place of the Belkin.
There are ways to make the Belkin work, the simplest being to disable the DHCP server in the Belkin and connect it to the ADSL modem via one of it's LAN ports (ADSL modem LAN port to Belkin LAN port).
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