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    TP TD-8817 with ASUS N66U on Sky DSL - Summary of Findings...

    This is a discussion on TP TD-8817 with ASUS N66U on Sky DSL - Summary of Findings... within the Wireless / Adapters forums, part of the Sky Broadband help category; Having bought a low-cost TD-8817 modem/router along with an ASUS-Wireless Router RT-N66U, and having spent time searching the various Forums, ...

    1. #1
      Ciren Jules's Avatar
      Ciren Jules is offline Sky User Member
      Exchange: 01285
      Broadband ISP: Sky Broadband Unlimited
      Router: ASUS N66U
      Sky TV: Sky Basic
      Join Date
      Jun 2013
      Thanked 2 Times in 2 Posts

      TP TD-8817 with ASUS N66U on Sky DSL - Summary of Findings...

      Having bought a low-cost TD-8817 modem/router along with an ASUS-Wireless Router RT-N66U, and having spent time searching the various Forums, I just wanted to summarise things specifically for Sky DSL Broadband users:

      1. Does the above combination work together on Sky BB? Yes
      2. Does the above combination allow you to use the advanced features of the ASUS N66U router? No

      So in summary, if you want a good, low-cost modem (sub 15) with some routing capabilities the TP-Link TD-8817 is 'good enough'. If you want more, then I'm now going to buy the Draytek Vigor 120 (around 50). If you're interested to learn the 'why' behind both these statements, then please read-on.

      Does it work and why is it 'good enough'?

      On the TD:
      Deactivate all the PVC's except PVC0
      Set the LAN IP to be, subnet (this means it only gives out 1 IP...
      Keep DHCP switched-on (so that it gives an IP address to the WAN port on the N66U e.g.
      Keep the TD NAT switched-on
      Switch-off the firewall and QoS (both are on the N66U)
      Sky adsl is PPOA and MUX or LLC encapsulation (both the latter work)

      On the N66U:
      WAN Configuration - set to 'Automatic IP', enable NAT, auto DNS or input OpenDNS for example.
      LAN Configuration - set this up the way you would normally do (making sure the IP range is something like (with LAN IP with other etc IP's given out by DHCP))

      Switch-off both devices, switch the TD on first - wait 'til all the lights are on - then connect the WAN port on the N66U to the TD ethernet port and power-up the N66U and you should see via the N66U's browser-based management console that the N66U's WAN IP is and that the Internet light on the router is flashing. Be aware that you have it working in what's called 'Double-NAT'ing' (as NAT is on both the modem and the router) - this can cause problems with some online games.

      Why doesn't this allow use of the advanced feature-set? Because the WAN IP of the N66U is 'private' and you can't reach it from anywhere on the Internet. So if you want to create a VPN to the N66U (so you can use iPlayer and the like whilst you're overseas) or if you want to use OpenDNS for web content filtering, then you need the Draytek modem. Why? Because the TD-8817 doesn't (to my knowledge now) bridge between Sky's PPOA and the N66U's PPOE. The TD has an option to enable a (software) bridge port for PPOE but this is no use if the TD has to be set-up in PPOA to get an internet connection from Sky. If Sky used PPOE then this TD device would do the basic AND the advanced stuff because the TD would connect on PPOE and pass its internet IP through to the N66U (which is also on PPOE). I've read a few threads about putting the TD in 'bridge' mode. Again this is no use if you are a Sky BB customer because you're bridging to the N66U which can't connect using PPOA (you can only configure PPOE on the N66U).

      So, what makes the Draytek different is that it CAN bridge between PPOA (on the Draytek) and PPOE (on your N66U). This will mean the Draytek passes Sky's internet IP through to the WAN interface on the N66U - meaning that you can now reach the N66U from anywhere on the internet. As the Sky internet IP is dynamic, there is an option on the N66U to set-up DDNS which seamlessly manages any change in your Sky dynamically allocated public IP (say you rebooted the modem, every time you do this, Sky allocate you a different internet IP, you would not know how to connect by IP if you were overseas).

      I also read somewhere that if you're further than 1.5 or 2 miles from your Exchange then the TD didn't work - that's cabling rather than line of sight distance btw. Unsure if this is true - but bear it in mind.

      The key point is that if your ISP uses PPOE then the TD is fine, it's a combination of Sky using PPOA with the TD not bridging to PPOE, that means Draytek's PPOA to PPOE in-built bridge does the trick.

      Hope that helps explain why some people say 'it works/it doesn't' and why, depending on your ISP, even the basic/advanced 'it works' is more difficult for Sky BB users to understand?

      If I've missed a trick, or how being on MER changes this, please let me know.

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