Not simply. You could probably do a port redirection on one of the internal servers to achieve the same aim though, assuming you're running a credible server OS or WinXP;

On router:
routerip:12078 -> 192.168.0.17
routerip:12079 -> 192.168.0.18

On 192.168.0.18:
192.168.0.18:12079 -> 192.168.0.18:12078

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Mk2a 60GB Blue. Serial 030102962 sig.mp3: File Format not Valid.