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I have just bought an ASUS router model rt-ac51 u.
Tried to set it up just now and from what I gather, it doesn't have a DSL modem inside so am I correct in thinking this won't work until i purchase one?
Reading a few forum posts that are similar, some people recommend asking VF for their broadband username and password and setting up as PPOE. Is this to get around the modem issue or do I need the modem no matter what?
If you have an Asus RT-ACxxY type router and you are on a VDSL FTTC (Fibre to the Cabinet) plan you will also need a modem (Avoid the Netgear DM200 it has issues!). If you have FTTP then you can connect the router to the device that terminates the fibre connection inside your property, but the setup will be different.
Assuming FTTC, you need to set the VLAN tag in the modem to 101, allegedly you need to set the VLAN priority to 2 but this doesn't seem to be necessary (and may even cause it not to work). In the modem you do need to set up PPoE with the username and password you obtain by calling Vodafone - get them to email you these, as otherwise, it's not uncommon to get them wrong, and they are in the FORMAT:
Username: dsl123456 'at symbol' broadband.vodafone.co.uk
In the above my Vigor130 modem which only has a single ethernet cable is set to 192.168.5.1, these settings allow the router to appear to the modems control interface at 192.168.5.10, while the router manages it's own network at 192.168.1.x
Also those DNS servers are a subscription service so you are better off using 126.96.36.199 and 188.8.131.52
Thanks @KeithAlger - very helpful
I've decided to return the ASUS router as looking at the prices of modem's it makes financial sense to purchase a router with dsl modem built in.
Would you be able to confirm if a TP Link Archer VR600 will work without the need to purchase an external modem.
If so, are the steps you outlined below still the one's i should follow to get this router set up when it arrives or are they different now I don't have a separate modem like yourself?
There's a few people on here using the Archer VR600. The info you need is the same, but as all the setup info is on the one page it's a little easier. *The VLAN 101 setting will be on the same page as your username and password. What I would try though is to get as many of the settings into the router before you plug it into the wall, as rebooting a combo modem/router too often in a short amount of time can cause the cabinet to think there's a fault and have the DLM kick in reducing your line speed!
You can plug it into the power, and either use the WPS button or an ethernet cable to put the settings in. You can do that before you connect it to the phone socket!