I got a Linksys router what I'd like to use instead of the TalkTalk modem-router. My question is how to connect it to the fibre optic equipment. As it is not a modem, I suppose I have to connect it's Internet RJ45 to one of the TalkTalk router LAN ports, then configure both devices appropriately, to take the router services (NAT, DHCP, Wi-Fi) from the first device to the other. Is that correct?
I've not done such a configuration before so I don't know too much about the router's modes. I heard of bridge mode, but it sounds different: to allow 2 routers to share one Wi-Fi network. But I don't need Wi-Fi from the first router. I'd like to use it only as a modem. Is this possible?
The TalkTalk router: D-Link DSL-3782
The other router: Linksys WRT3200ACM
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If you turn off / disable the wifi in the Dlink router and just connect the 2nd router as you descripe, no further configuration should be required. I've done something similar with a TP link, but as I use the wifi on both routers, I changed the Ip range of the second router to 192.168.10.1 so there would be no ip conflicts.
Thank you. I disabled not only the Wifi, but also DHCP on the router/modem, because I didn't want a LAN in the LAN (2 networks, one inside the other), with both routers doing NAT. This is usually not a good idea, even if it works most of the time. At best it gives you latency, at worst connection problems, so it is not recommended.
I put the modem-router in bridge mode, as suggested in this post by @charlesb224 . This way (disabled the DHCP server first) the DLink acts only as a modem, and the router connected to it gets the (external) IP address from the ISP. And can be used as the only router.