routing within the same subnet

["Matthias D. Caraco" <openbsd_(_at_)_caraco_(_dot_)_ch>]

Hi,

I am trying to use an OpenBSD-Firewall to shield an existing network 
with all public ip's. In addition there will be a few services
running on the external interface on the box. When I now do the setup 
with public ip's on the external and the internal interface I cannot
get thtough the FW. Additionaly on the FW  itself I can only ping the 
external interface but not the internal one.
I turned ip-forwarding on and so far haven't turned any packetfiltering on.
How do I do the correct setup? Do I need special routing added? ...

Daniel