I have a speedtouch ST516 and a WRT160N router ( on the back of the modem it says WRT160N, I assume this is v1). While I have this scenario a year ago I have it again because i reset the configurations.

I have the following scenarios:

1.I can connect to the modem ip without the linksys router

2.I can connect to the router ip with the router and modem connected.

3.I remember having DHCP disabled last from the past year because the speedtouch ST516 can also assign ports and ips.

4.I use PPPoE on my modem.

I basically want the router to be disabled from assigning ip addresses ( I believe this takes away the Dual Router Network problem . However i want the router to send out wireless signals to my laptop and other devices ( I can set this up myself once everything else works).

 Other info:

My linksys router uses the subnet 192.168.1.1

My speedtouch 516 uses 192.168.1.254

I believe they should both be in the same subnet to do port forwarding?...

I believe im looking for something in the knowledge base with the name of "Setting-Up a Linksys Router Using DSL Internet" with a speedtouch516 or dual router

I checked the ST516 manual, but I could not tell whether or not 192.168.1.1  would be considered a valid fixed LAN IP address, from the ST516's point of view.  If so, then you can leave the WRT160N set to this address.  If not, you might need to change it to another 192.168.1.x  address (in step 1a below). 

So to setup your system, disconnect the WRT160N from your modem, then do the following:

1)  Using a computer that is wired to the WRT160N, login to the WRT160N, and

a)  if needed, change the "Local IP address" to another  192.168.1.x  address

b)  set the "DHCP server" to "disabled"

c)  click on the "Save Settings" button and wait (3-60 seconds) for the screen to refresh, then exit your browser.

d)  power down your entire network 

2)  Next, using an ethernet cable, connect the ethernet port of the ST516 to any one of the four numbered LAN ports on the WRT160N.  Do not connect anything to the Internet port on the WRT160N.

3)  Power up your network.  It should work.

Note:  Your ST516 will control all the usual router functions (PPPoE login, port forwarding, DHCP server, etc.).  Your WRT160N will control its own wireless settings.

Open the Linksys Setup Page and do the following settings...

- Disable the DHCP 

- Under Advanced Routing...Disable "NAT" and Enable Dynamic Routing(RIP)

You sir, know what your doing and it worked. However before I mark this off as an accepted solution I would like to request a few answers to the following:

I use utorrent, does that mean i have to disable Nat on the linksys router address? ( I remember having this worked out like how you explained, and seeing the Single Port Forwarding section greyed off) ( Or should I leave Nat on for the router, incase I use my ps3,wii or xbox360)

Should the SPI firewall also be off?

I remember using my Wii and having 4 second lag when playing a match against a friend of mine that lives 5km away. ( My signal strength was all green bars). I believe the symptom is the wireless connection is not utilizing my maximum bandwidth, as in it is using the bare minimum. How would I go about making it be more efficient?

If I did not mention this one... I just received my new modem on Tuesday and im experience a total loss of 100kb on download speeds. Does this mean I should upgrade a firmware? ( Primus doesn't have a forum, so im asking here)

I use some applications that have UPnP should I only have one router having this on? ( I have it enabled for Speedtouch 516 and WRT160N, assuming"

Note:  Your ST516 will control all the usual router functions (PPPoE login, port forwarding, DHCP server, etc.).  Your WRT160N will control its own wireless settings." Common sense tells me to turn it off in the Router?

If im using utorrent would I definetly need a static ip? ( I still dont understand what the true meaning of static ip is... I know that static ip is an ip that stays on your... Either ( Computer, Modem, Router) and it does what?... Dynamic IP is one that changes and stays on your... and it does what?

At the time being I own a Wii, and I have read somewhere ( unconfirmed resource ) that the PS3 uses the radio band of 40Mhz? Would changing my radio band increase/decrease the speed of my Wii online play?

Apparently I was posting for 20 minutes. I'll disable NAT now...

Sorry, im kind of excited that this is working again. ( double post)

By making the changes that I outlined in my last post, you converted your Linksys WRT160N to a WAP (wireless access point).   Additionally, the WRT160N serves as a 4 port switch (where one of the ports is used to connect to the ST516).  Otherwise, the Linksys is doing nothing as far as routing is concerned.  Because you do not have anything connected to the Internet port of the WRT160N, the WRT160N's router functions are effectively disabled.

So, in answer to your questions

1)  You do not need to disable NAT in the WRT160N.  The WRT160N is not doing any NAT.  NAT is being done by your ST516.

2)  The SPI firewall in the WRT160N is not being used because nothing is connected to the Internet port on the WRT160N.  So you do not need to turn off the SPI firewall.

3)  When gaming, the fastest connection is obtained by wiring your computer to the router (either the ST516 or the WRT160N).

4)  What download speed are you getting when you connect, by ethernet cable, directly to the ST516?  What download speed are you paying for?  What download speed do you get when you connect, by ethernet cable, directly to the WRT160N?   These speeds should all be about the same.

5)  Because nothing is connected to the Internet port of the WRT160N, the UPnP setting of the WRT160N does not matter.

6)  A "static IP address" is simply an address that does not change.  If you want a static Internet (WAN) IP address (the address of the router's Internet port), you will need to get that from your ISP.  If you simply want your computer to have a static (fixed) LAN IP address, you can do that yourself.  I do not know what utorrent requires.   If your P2P software (utorrent) requires you to forward a port to your computer, then you will need to give your computer a fixed LAN IP address.   Note that any fixed LAN IP address must be outside your DHCP server range, and it cannot end in 0, 1, or 254.

7)  Using the 40 MHz  ( "Wideband" ) setting on your WRT160N might help, when using wireless n or g.  Try the setting, and see if it improves your wireless connection.

8)  Do not enter anything under "Static Routing".  You do not need this, even if you are using static IP addresses.

9)  I am a bit confused by your 51111 port forwarding.  Don't you need to specify the fixed LAN IP address of the computer that you are forwarding port 51111 to?

4) 250kb/s (300kb/s with download manager). Up to 6mbits (I believe i would convert this 6mbits ->6000kbits ->6000/8 -> 750kb/sec) 2 weeks ago I received 350kb/s (dl manager) ...then 1 year ago i received 400kb/s (dl manager)... WRT160N same as modem speed 250kb/s(300kb/s with download manager).

9)I want to port forward 51111 using TCP.

http://i823.photobucket.com/albums/zz157/rakasan/speedtouch516portforward.jpg

Upon completion of this port forwarding. I would then assign this to a device. (I could see my computer name and my laptop name on a drop down menu) ( At this would I would setup a static ip... how do i figure out the range of my DHCP)

Did a few throughout search and I believe this is the range of my DHCP

DHCP Pools

DHCP Pool Name                     Address Range                                     Gateway

LAN                                       192.168.1.64 - 192.168.1.253                   192.168.1.254

So if i want to setup a static ip on my computer it would be 192.168.1.10 and my laptop would be 192.168.1.11