[CentOS] CentOS port forwarding?

Dear All
I have my CentOS server at @172.16.17.100 and my remote network element at @
172.16.17.110 and both ones have Internet access . I need to virtually put
the remote network element on the same LAN as my CentOS server to be touched
with . In my application , both the ip addresses are as invalid ones and I
cannot change them . Can you please let me know if there is a settings on
the CentOS server that can do the job or just the port forwarding on the
attached gateway can be used ?
Thank you
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