TP-Link TD-8817 (ADSL Modem) / ASUS RT-AC56U (wierless router) XLN Telecoms (or others)

[funkytwig]

Hi, I have been fighting for a day to get a TP-Link TD-8817 ADSL Modem and a ASUS RT-AC56U wireless router to work together. I decided to just connect the TD-8817 directly to the computer to get the ADSL setting working and managed this. Connecting the 8817 to the Internet port of the AC56U worked and made the Internet available to all the wireless clients.

As a side not XLN Telecoms (who I use) are a allegedly business broadband provider (see footnote 1 at bottom).

The problem was I was going through two NATs and getting the error ''The wireless router currently uses a private WAN IP address (192.168.x.x, 10,x,x,x, or 172.16.x.x). This router may be in the multiple-NAT environment and DDNS service cannot work in this environment.''

So I did a bit of digging and it seems I need to use the 8817 in Bridge Mode. This post is to check I understand things correctly (hopefully this will also be useful for others also as the information is sprinkled between various forum posts on various forums). Be good if people could let me know if I am correct and if not refer to the numbers below (Will turn this into a blog post for others benefit when I get it working).

This should also apply to other ASUS routers (which have a WAN/Internet port), i.e. not there ADSL models.

(1) Start by setting the 8817 to factory defaults (if you want a easy life),
(2) Set 8817 to Bridged Mode, this is done via Quick setup. Select Bridged mode rather than PPPoe/PPPoA.
(3) Bridged mode connects the modem (8817) to the router (RT-AC56U) using a IPv4 static IP address. To access the 8817 from a web browser cinect the 8817 directly to the PC with a internet cable. The default IP for the 8817 is 192.168.1.1 so setting the PC to a static IP of say 192.168.1.10 will work). Access the 8817 via a Internet Browser using URL 192.16.1.1 enables you to access the 8817s web interface.
(4) Alternatively you can access the 8817 by connecting it to the PC with a USB cable, again using the same static IP. Check manual for details.
In Bridge mode the 9917 will only have the ADSL light lit.
(5) DHCP should be disabled on the 8817 (as you are using static IP).
(6) Best (but not necessary) to have the 8817 and AC56U on diferent subnets (i.e. 8817 on 192.168.1.1 and AC56U on 192.168.2.1). The Subnet Mask must be the same on both (i.e. 255.255.255.0).
(7) For reference PPPoE/A will be set up between the vsp bras and the N56U. There will be only L2 ethernet traffic between the two while PPPoe/A is establishing and the N66U will get its ip from the vsp. The 8817 will be inside pppoe with the bridge between the AC56U and the and the isp bras
(8) Now this is where I am a bit unsure. I think I need to tell the AC56U to get the internet connection from the 8817 by telling the AC56U the IP address of the 8817. So i think I need to go to WAN->InternetConection and set up the following:

WAN Connection Type : Static IP
IP Address : 192.168.1.1
Subnet Mask : 255.255.255.0
Defaul Gateway : 192.168.1.1
DNS Server 1 : 192.168.1.1 (See fottnote 2)
DNS Server 2: : 192.168.1.1 (See ootnote 2)

(9)Now here is where i get into real problems. In The UK we use PPPOA, not PPPoE and I cant find ANY reference to PPPoA in the AC56U manual. I am not even exactly sure where to put the ADSL username and password in the AC56U.
(10) Even worse than this is there seems to be no reference to VPI/VCI in the AC56U manual. I know it is important but where do I put it in?

I am doing this for a friend who runs a small charity. I Cant get in for a bit to try this but would be great if people could give feedback so when I do I can get it working easily.

Thanks for reading this far,
Ben

Footnote 1
I say allegedly business as the only suport the modem they supply, Tecnicolour TG582n, which is very limited in functionality (i.e. you can do VPN tunneling with it). I asked them if they had any information on getting any other kit working, either specific or general, and it was a big NO. All they could supply me with was username, password and the fact they used PPPoA. They would not volunteer any other info such as VPI/VCI. I would therefore describe them as providing support for domestic broadband so if you want an easy life with anything more than a very basic setup you may want to consider going elsewhere.

Footnote 2
I am not sure if using the 8817 is Bridged mode allows it to act as a DNS. If not get the DNS from your ISP and put it here. You could either use DNS1 and DNS2 from your ISP (they will provide 2) or DNS1 from ISP and 8.8.8.8 (a public DNS provided by google) as DNS2. Using 8.8.8.8 as DNS2 will get googles DNSto be used as a backup in case your ISPs DNS goes down.

 

[RealBeast]

It would be easier to use the ASUS as an access point with an LAN to LAN connection and turning off DHCP in the ASUS and giving it a static address in the network but outside of the main router DHCP assignment range.