Two NIC, one on LAN, mount home via LAN

My OSX server is on DMZ, with external IP and “real” DNS name.
The server also has a Gigabitcard to the LAN, I want fast access to homes.

In Wgrman. the AFP-home for users points to the LAN port on the server:
afp://192.168.x.y/server

And the NFS home path points via the firewall and DNS lookup:
/Network/Servers/my.domain/Volumes/Sharepoints/server/

Wich are two different cards on the server, ok? The domain, points via ISP DNS to my external IP

It works, but not good.
I would like the Firewall and domainname to stay out of this.
But I cant get the afp to be mount record under
/Network/Servers on the clients.

I would like NFS to be
/Network/Servers/192.168.x,y/Volumes/Sharepoints/server/

Any familiar with network mounts and/or different NIC for LAN/WAN

Jocke