Is this kind of network possible?

First of all.. i work at a computer shop… (im not a very techie though) 1 isp… 5 ips with each having a 5mbps speed.. as they said.. our original setup is… modem (4 port) –> linksys Dual-Band Wireless-N Gigabit Router (4port) –> Dlink Gigabit switch (24port)>> then 21 computers.. 1 is acting the time server for the 20 computers.. internet setup is static… since i used 1 of the 5 ip's available.. there's 4 more.. router ip> 172.16.2.1 so all of the computers' gateway is 172.16.2.1.. and then there is an issue regarding the speed of our net.. since it is a shop.. we cant avoid others to download (hogging all the speed).. so a lot are complaining and then im askin myself "why not use 1 more ip of the our isp.. so that there will be more speed"? what shall i do?? should i buy another router? and if i have that another router.. what will be the setup?? im thinking like this.. modem port 1>> 1st router(172.16.2.1)>> dlink switch>> 10 computers com#1 ip is 172.16.2.6 sub 255.255.0.0 gateway 172.16.2.1 modem port2>> 2nd router (172.16.2.2)>> dlink switch>> 10 computers com# 11 is 172.16.2.16 sub 255.255.0.0 gateway 172.16.2.2 that way.. each 10 computers are enjoying a full 5mbps speed.. instead of 20 sharing it right? now im asking "is the setup wrong?" why? and what should be the correct? if it is correct? will there be a network traffic issues? will the time server be able to see them all? will the 21 computers be able to see/connect each other in lan games? please teach me how… im begging you.. lately our shop has been decreasing in customers…

Hi dadisam, and welcome to the WTT forums.
Sorry to hear of the issues your are experiencing with your network.

From what you say, this seems to be a network for a commercial organisation, and if this is so then it would be better to consult your normal IT advisor or firm of IT consultants for the advice you seek.

We are here to provide free assistance for folks over the age of 13 years who need help with their "home computers" and the like.
Have a look at our Terms of Use, and here's an extract;
•We offer free computer help and tech support for home and personal use. We are not here to support others that work for profit, or to support/replace your company's IT department.

Let us know if we have misunderstood your post in any way.
Regards
paws

While I agree with Paws' view on providing support for a commercial IT company, let me clarify one thing for all future readers.

If your ISP is providing 5Mbps of bandwidth, it is shared with ALL connected devices. It doesn't matter if you have one static IP or 5, or if you have 1 port to plug into on the modem or 4 ports. You are sharing only 5Mbps. So, to the original poster - there is nothing you can do to increase your bandwidth on the network. What the ISP is providing you is all you are going to get no matter how you wire it. If you want more speed buy more speed, or get a different ISP.

If there was a reason to hook up two routers and still accomodate your needs as it is in your environment there are several issues why the setup you describe would have trouble and would not work, but because it won't make any difference on the speed of your internet, its pointless to discuss.