|i checked that before, ipconfig, release, renew and the deafault gateway is the Linksys router 192.168.1.1 for all of the PC's in the office and so is for the server.|
Yet the internet access is still going through the server.
According to the above information, external traffic can not be flowing from clients, through your server, and out to the internet.
What is making you think all internet traffic is flowing through the server?
Here's a quick run down on how traffic flow works.
Within the LAN, a Default Gateway is not needed. Every computer that's properly configured and on the same network can communicate with every other computer on the same segment (assuming all are correctly configured).
Whenever local traffic needs to pass through a beyond the local network to another network, then you need a "gateway" device.
In your case, your clients wish to access the internet. Your SOHO Router is your gateway device between the internet and your LAN. The LAN side of your router is assigned the following IP address: 192.168.1.1 as stated by you. Thus, all client computers wishing to access the internet need that address as the "default gateway" IP in their TCP/IP settings. That way when traffic needs to pass outside of your LAN, it knows where to go (ie: it goes to the gateway device which then handles it from there).
In order for all LAN traffic to flow through your server and then onto the internet, all clients would have to have the server's LAN IP as their default gateway address.
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.