NTP Server

I have 2 Network cards.

eth0 has internet access
eth1 has no internet access

If I put the Server IP in the phone from eth0 has ntp service, but if i put Server IP in the phone from eth1 has no ntp service.

can I configure something that can help me in order to provide NTP in both network adapters? I mean, i don’t want establish communications between the two networks, because it could be a solution, but the network on eth1 should be isolate

Excuse me for my bad english.