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How to share/print files between a SBG900 modem and a lynksys router

I have a desktop computer with a printer that I want to share with 2 laptops. The deskop is connected to a linksys router, the router is connected to a sbg900 wireless modem, and the wireless modem connects my 2 laptops.   I know I need to set up something on my linksys router and possibly on the sbg900 modem.  Does anyone know how to do this.  Is it Port Forwarding on both devices? and how is it set up?
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Mipand
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Please help!!
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I presume that you have this:
The cable modem / wireless router is connected to the Linksys router using the one ethernet cable on the modem AND that cable is plugged into the WAN/Internet port on the router.

Since you didn't say what the Linksys model number is, then I will have to presume that it is NOT wireless capable as well.

The simplest thing to do is this:

1) Access the router control panle and turn off DHCP for the LAN.  Make note of the IP address of the router.
Better yet, make the IP address of the router LAN side an address that's in the range of the modem LAN subnet.  That way you can still reach it easily after this change.  Make that change LAST.

2) Plug the ethernet cable from the modem into the LAN side of the Linksys.  Now you are using the Linksys as a simple switch.  No NAT, routing, gateway at all in this box.

Now your computer, if on DHCP i.e. "get an address automatically" will get its address from the modem and will be on the same LAN as the wireless computers / laptops.  
Now file and printer sharing should be the normal thing.
I'm expecting that the issue is that you have the Linksys router blocking the access.  I'm guessing that the physical connections are as follows:
Internet -- sbg900 -- LAN port on sbg 900 -- WAN (internet?) port on LInksys Router -- LAN port on LinkSys Router -- desktop computer.  Am I correct?
fmarshall is exactly on target.

Why are you using the Linksys router at all?  Isn't the sbg900 adequate?  If you are using it as a switch only, I'd strongly suggest purchasing an inexpensive switch instead of using a router.  MUCH simpler.
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I should probably explain that the lynksys is being used for Vonage. (model: RT31P2)

Computer 1, printer, Phone - lynksys router (RT31P2) - SBG900 - laptops
Mipand,

The problem you have is because you have two local networks. The easiest way is to do the following:

Disable the wireless on the SBG900 and enable/create wireless network on the linksys router. This way all your devices (wired & wireless) will be on one network.

If you need more detailed help on both devices, please let me know.
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i guess that would complicate using the lynksys router as a simple switch. I believe that would drop the phone from working
No worries. Then what you can do is flip the roles. Make the motorola the main router and just disable NAT in the Linksys. The vonage feature will still work because it doesn't care about the Local Network, it only cares about the WAN (internet). To disable the NAT feature on the linksys:

Log into your Linksys router Usually (192.168.0.1 or 192.168.1.1) in your browser. enter your usr/pawword. go to advance routing I believe. To disable NAT, click the Disable radio button. (When NAT is disabled, the DHCP server feature is also disabled.) With both the NAT & DHCP disabled your "router" is now a "switch" VOILA.. enjoy
The Linksys RT312 doesn't have wireless.
I'm not sure that it won't work as I described.  It has 3 RJ-45 LAN ports - enough for the two that I suggested be used.

The key here is whether the VOIP connects to the internal switch function as I suspect it may.  If not, then the suggested approach won't work.
But then, if the RT31P2 is intended to perhaps take a public IP address then that would be the only choice I do believe....... for the VOIP to connect via a LAN address and go through the NAT.  

It's worth a try as no new hardware would be required and we can learn almost in real time if it works.. etc.
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lol, looks like we've probably confused you.

Okay. First setup the linksys with a static IP address.
Since the motorola is the gateway it should have 192.168.x.1*
So, your Vonage Linksys could be IP: 192.168.x.2, Gateway: 192.168.x.1, DNS: 192.168.x.1*
Now, that your done with that Disable NAT on the linksys. This will make your "router" into a "switch"

Go to your motorola, and put the Linksys IP Address 192.168.x.2* in the DMZ. This will make sure all traffic is open to that IP address.

* this value varies so make sure to check what number is the "X"

Once you have all this you should be able to receive incoming calls from the vonage, and be able to get a DHCP address from the motorola.
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sounds good, I will attempt this.
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