Thanks you all to your timely response. i got the problem solved. the problem was not from my LAN, every devices in the LAN got appropritate IP from DHCP and can ping my WAN interface IP, only that NAT was not function properly even though i was correctly configured; but this device has a unique statment which needed to be add to my nat inforamtion before nat would ever work well and that is "reversal" i arrive at that by using ? at the end of every command i entered to the router for me to see more useful commands availlable. as a matter of fact the moment i add that, the problem solved every one can connect to the internet. the command "reversal" at the end of NAT overload statement permint NAT in - NAT out on my WAN interface.
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