Internet connection Woes using ddwrt

[Dratsab]

Hi everyone , I am a long time lurker here but i hardly post. I need some expert advice from the most knowledgeable forum participants that I know of , which are you guys.

I and my buddy share an apartment therefore we decided to share the internet connection too.

On my end everything works. I use an Asus RT-N66U with default firmware. However since I work from home and run a server I do not want my buddy to be accessing my network as I have a lot of sensitive info.

So I connected the Ethernet cable, coming out of the broadband modem itself, the one my isp has given me, to a network switch, a tp-link gigabit 4 port switch to split the internet connection.

From the switch I ran a connection to my self bought router the Asus RT-N66U. As I said everything works fine on my end.

My buddy lives on the second floor, so we called an electrician to set up a cat 6 ethernet link between the two floors.

However when he connected his router to the same switch through an electrician installed lan port connection using a brand new tp link tl- wr1043nd, he does not get an internet connection.

I have personally tested this router as I flashed it with dd-wrt for him and connected it to the same gigabit switch and it works just fine.

So now i have an unhappy buddy and it feels as if we just wasted money installing the cat 6 ethernet link between the two floors. It is still under warranty ( the cat 6 connection ports n link).

So can anyone help me with this issue?
I would be really appreciative of your help.

 

[JackMDS]

Well, ir seems that the new cable does not work.

Get the electrician to correct it.


😎

 

[nsafreak]

You have your network setup in the wrong sequence. You can't go gateway -> switch -> router & another router hooked into the same switch, you'll create a number of conflicts. Specifically your gateway device (guessing a cable modem here) only has one WAN IP address to hand out that both of your routers are fighting over. His router needs to be plugged into one of the LAN ports on your router. You should be able to set his router so that it's on a separate network but still has internet access. Essentially you'll want to have his DD-WRT settings similar to this:

Local IP Address: 10.0.0.1
Subnet Mask: 255.0.0.0
Gateway: xxx.xxx.xxx.xxx (Insert your router's IP address here)


This will create a separate network on its own subnet that uses your router as a gateway. Still not the greatest thing as your roommate will have to deal with double NAT which is typically not good but with the way you want the network setup pretty unavoidable. You could avoid the double NAT if you want to install DDWRT on your router and setup a VLAN for your friend's router to sit under.