I have a client with Virgin Media cable broadband. He has a Motorola SB5100 cable modem with both USB and network connectivity. In its original configuration the modem is plugged directly into a desktop PC using a standard network cable. IPCONFIG shows the network card IP address as 77.xxx.xxx.xxx (Class C) and a Gateway address of 77.xxx.xx.xxx. Everything works and speed is good.
We now want to add a router to this set-up this router will provide two main additional features a VPN to the clients office (some 20 miles away) and wireless connectivity. Neither of these issues is seen as a problem once the router is installed and internet connectivity is working.
The issue is however that Internet connectivity cannot be achieved.
The router is a Draytek Vigor 2820n (802.11n wireless). See http://www.draytek.co.uk/products/vigor2820.html
The 2820 series routers have dual (fail-over) WAN ports. WAN 1 is for standard ADSL via a standard cable to micro-filter and BT socket. WAN 2 is for an Ethernet connection to a second ADSL modem, cable modem or any other Ethernet-based Internet feed. Further the literature states If you don't have ADSL, the Ethernet WAN port can instead be used as your primary/only Internet connection (using NAT) so the same router can be used for either ADSL or Ethernet Internet connections.
So I am confident that this piece of kit will work if I can find out how.
As DHCP to the PC and a wireless connected notebook is required from the 2820n I accessed the cable router webmin (on 192.168.100.1) and disabled the DHCP service.
I used a standard (not X-over) network cable from the cable modem to the router WAN 2 socket and another standard network cable from one of the 4 x Ethernet ports on the 2820n to the PC network card.
I read-up web-based advice on connecting routers to cable systems and started from everything switched off and unplugged from power for a couple of minutes. Then I brought the cable modem up and waited for the service to connect. Then I switched on the 2820n.
The 2820n was set-up with the users Virgin Media username and password and the broadband domain (I used blueyonder.co.uk as this seems to be valid as the user has a blueyonder.co.uk email address)
The 2820n webmin showed no connectivity on WAN 2 (WAN 1 is disabled).
I had by this time also spoken to Virgin Media support. Very basic help is given but nothing in depth as they do not support third-party routers a fact repeated to me several times! They want to sell their routers at £40 a time but they have no VPN engines and are only 54G. I did glean that the DNS server addresses were important.
So I tried putting in the DNS server addresses into the 2820n no change.
Then I read some more web-based articles and saw notes concerning the MAC address. This basically advised to try fooling the broadband service into believing it was connected to a network card rather than a router (tenuous I thought but work a try). So I entered a manual MAC address for the network card into the router and Bingo!! The 2820n showed a connected WAN 2 port.
Trouble is that the browser wont browse it just shows Page cannot & and IPCONFIG shows Destination Host unreachable on pings to website names and IP addresses.
HELP! I need very specific advise on what settings a put into the router. I have the same router on my network so I provide below screen-shots of the relevant areas (I have ADSL so some of the settings are not pertinent to the cable broadband I am trying to work with at my clients).
1st shows how I have set-up the router for the cable broadban
2nd shows the WAN 2 config page 1 (PPPoE tab). I had enabled this page and set the network card MAC address all other settings remain the same.
3rd shows the WAN 2 config page 2 (Static or Dynamic IP tab). This was Enabled and I set it to Obtain an IP address automatically. Router name Vigor 2820n (I hoped this was just a label. Domain name blueyonder.co.uk I again specified the network card MAC address. All other setting left alone.
4th shows the WAN 2 config page 3 (PPTP tab). Left disabled and with no settings changed.
5th shows how the router is set-up for the cable service i.e. Channel 1 disabled and Channel 2 enabled (reverse of the settings on my router)