how to configure the services that only accessable from particular IP address
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Another way could be to use tcp wrappers to deny access to telnet from other addresses. But as advised, ssh is reliable and more secure.
That is supposing that the telnet server is built with the libwrap library. I can't check because I don't have the telnet server installed and don't intend to. It isn't even on my dvd install disk that I can see.
I think that that setting opens the port on an internal NIC but not an external one. It is generalized so it you change a NIC device from internal to external, the ports will close.
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