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DSL Modem to Asus Router Bridging Problem

Asus Rt-n16 wireless router
January 31, 2010 at 12:48:55
Specs: OS X / Windows 7

I thought I knew a fair bit about computers until I try networking! For some reason I always have SOO much trouble getting wireless networks and modems to work properly!

I have searched the internet for several days now trying to solve my problem, but as of yet have not found the right answer. I was hoping someone could help me.

I previously had a wireless g modem/router. Worked fine, but I wanted more speed (locally) and some other features (USB, etc).

So I bought a D-Link DSL-502T modem and Asus RT-N16 wireless N router. I originally tried bridging my old G modem/router, but it just wouldn’t work so I thought I would just use a straight modem instead and sell the modem/router.

My provider, XNet in New Zealand, has the following settings:
PP Setting: PPP over ATM (RFC2364) VCMUX encapsulation
VPI Setting:0
VCI Setting: 100
Authentication: PAP
Primary DNS: or
Secondary or

Basically, my problem revolves around bridging! I tried bridging the D-Link DSL-502T, which seemed to work. Then I connected the Ethernet to the Asus RT-N16 WAN port.

This is where my problems start. In the Asus interface, there is NO OPTION for PPPoA. Only PPPoE, Dynamic IP, Static IP, and some others. Entering my username and password with PPPoE does not work, as it fails to connect to the internet (the router tells me there is a problem.

The ONLY way I can get it all to work is if I get the D-Link DSL-502T to connect to the internet, then connect the Asus RT-N16 and set it to Dynamic IP.

However, my ping is suddenly really bad (130 and above), and although my line speed is about the same web pages take forever to start loading.

So I suppose my questions are:
1) IS it better to have the MODEM in bridge mode and have the router put in the connection details?
2) If so, what am I doing wrong?
3) Can PPPoE work as PPPoA?
4) Is it my current way of connecting that is causing the large ping and lag?

ALL help is so very much appreciated! Networking is painful for me!


See More: DSL Modem to Asus Router Bridging Problem

February 1, 2010 at 07:50:42
Why are you trying to bridge???

If both are routers then you connect the combo modem/router unit first and get it working. Once it's working you are now ready to bring the second one online. How it connects (PPoE/PPoA) depends on your ISP and you'll have to get that information from them, not us.

Click on my name above in my response and read my "how-to" guide on "adding a second router". I would recommend using the LAN port to LAN port scenario.

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February 1, 2010 at 12:05:44
Hi Curt,

Thanks for the reply!

Basically I don't want to use my OLD router/modem, just my new modem and seperate N router.

It DOES work if I have the modem itself connect to the internet and connect the router to the modem, but it is rather slow compared to what I used to get.

I just thought Bridging it might make the speed problem go away as the router would control it all! Maybe I am wrong?

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February 1, 2010 at 12:51:07
So I bought a D-Link DSL-502T modem....

According to this link on D-Link's website the unit you bought is a combo unit. And I quote, "High-Speed ADSL-2/2+ Modem/Router Combo for SOHO & Small to Medium Business

So since it has a built in router, my recommendation is to set it up not as a bridge, but as a router and use the LAN to LAN scenario in my how-to guide.

As I said, a bridge is really unnecessary in this case and I recommend against setting up in bridge mode. You're just adding to the complexity.

If you do what I say, you end up with the second router daisy chained to the first, basically acting for all the world like another client on the network with one exception. It will be providing your wireless network.

I would recommend disabling DHCP on the second router and letting the DHCP on the first router give your clients their TCP/IP settings. You definitely don't want both router's running DHCP unless you divide your scope into two smaller pieces and give each one it's own piece. Again, you'd be adding complexity in doing so and I live by the KISS principle.

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February 17, 2010 at 02:01:19
Thanks for all the help Curt!

I connected it all up as you described, doing every setting you stated in your first option, but my internet has slowed to a crawl! I am sure only the DHCP on the modem is active, and I don't know what else it could be?

When I just use the modem, it gives an internet speed of 4 mbps. When I connect through the router, I get about 80 kbps!

I have not spent hours and days trying to solve this! I think networking hates me!!

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