Cisco Router 2800 Config

I got a router and 5 static ip from ISP. One is used for connecting internal VLAN. I need to assign the remaining 4 IP to a new server. The new server really got the IP, however, it always fail to ping to the default getway and DNS server. The new server connected the VLAN same with the PC in the VLAN so far.
How can I do? Do I have to change the physical connection for the new server?