If i use this configuration with SME-Server as Server Only :
Internet-----Gateway---switch---worstations
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SME Server(Server Only)
Is it i possible to route the public ip's throught the gateway and the SME be the DNS server (mail,web,ftp).
Holo, this is not a good idea unless all those other computers are hardened servers. That being said...
What you need to do is set your gateway for
bridge mode. As a "bridge," it will just convert your T1/cable/dsl line to Ethernet. You then statically assign all the IP info (ip address, mask, gateway, dns, etc) to each computer.
Your SME box will also need a public IP address. From there, you will probably want to do some fancy firewall rules so that SME is both fully public, and set to only talk to your block of IP's. This is beyond my pervue.
Be careful: setting your gateway to a bridge can be a risky maneuver, and you can easily turn it into a brick. If this device was purchased from your ISP, I would call them and have them set it for "bridge mode" for, were I you.