2 IP's 1 Wire

This may sound stupit, but
Do you know how could I separate 2IP's from 1 Wire

1 IP for server
1 IP for wireless router
1 Cable

I'd like to avoid server routing

I don't want to use WiFi router for this.... I'd like to separate server IP from Home IP

[Hope you understand what I mean]
 
Any switch should work? IP 1 on server on switchport 1, IP 2 on router on switchport 2, uplink on switchport X -> DSL/cable/whatever?
 
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