Connecting 2 computers and internet

I have an iMac 4.1 Intel core duo. I have been connecting the Mac with my old Windows machine through Airport and a wireless adapter on the Dell. This worked fine but is rather slow. I also connected the ADSL router to my Mac and the internet was fine.
I purchased a network switch. When connecting the Mac and Dell to the switch and setting the IP's I can connect the two machines without a problem.
I set the Ip's as 169.254.229.178 on the Mac and 169.254.229.179 on the Dell. The subnet mask is set at 255.255.255.0. PPPoE is then disabled and the two machines can see one another and communicate fine.
As soon as I then plug in the ADSL cable from the ADSL router I and activate the PPPoE on the network settings, the Subnet mask disappears and the IP shown in Info Network utility differs from the IP I set manually. I cannot ping myself on the Mac and the Mac and Dell can't even ping one another.
If I disable the PPPoE again and set the TCP/IP to manual then the two machines can talk, but no internet.
I have used the location "Automatic" and the Show is "Built-in Ethernet".
Can someone please assist me on setting up the home network connected to the ADSL router. I don't need internet on the Dell.
Thanks

Our ADSL uses PPPoE to connect and not Dhcp. If you do an ipconfig/all on the windows machine one of the lines says "Dhcp enabled - NO".
Most ADSL uses PPPoE but if you have been running the PPPoE client on the mac then your router is just acting as a modem, in order to connect both your mac and your pc to the router you need to setup the router as the PPPoE client and turn off pppoe on your mac.
without the routers make and model I am unable to find you a howto. You normally access an adsl router setup though a web browser using it ip address refer to its manual.
But try this this may work unless your isp pre configured the modem/router with different settings. first of al give your mac a static ip address.
goto system preferences --> network--> show built in ethernet --> tcp/ip
ipv6 manually
ip address 192.168.1.10
subnet 255.255.255.0
router 192.168.1.1
click apply , connect your mac directly to your router.
then goto http://192.168.1.1 can you now access the router's config page? the default user name and password for telkom router is root

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