Adding extra wifi (modem/router) to my already extended network

By Tommygunn
Jun 12, 2014
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  1. I have an internet connection that I have extended to my Brother in law's house, next door. At the moment, I basically have two LAN cables coming out of my modem/router, one going to my computer and another, extended cable, going to his computer.
    However, he wants to use his spare modem/router, which has wifi capability, to allow his son to use his own computer downstair with only wifi.
    Therefore, will there be any conflicts if I simply splice in a Lan cable or add a lan socket for the second modem/router (wifi location.) at the appropriate point along Lan cable 2? See diagram below.
    If there is a possibility of conflict what would be an alternate wiring method?


  2. jobeard

    jobeard TS Ambassador Posts: 9,156   +598

    Good drawing and this will work just fine. In fact, that's what I use to get access at the far end of the house. Here's the trick;

    router#1(lan slot) ---- (lan slot) router#2 with wifi​

    Notice that #2 WAN slot is left empty! This places all systems on the same subnet of the router#1 {what you are doing is making router#2 act like a switch which has wifi support (y) }
    • * Give router# a unique LAN address (If #1 is, then make #2 This will allow each to be manage via a browser connection
    • * in router#2 disable DHCP. This forces #1 to be the manager of the entire network and it will handout all IP addresses
    Personally, I use the MAC addresses of my devices to enable router#1 to use Address Reservation of IP address for all devices attached to #1 (ie I map the devices to the range 1.2-> 1.10)

    Then set the DHCP range in #1 to 1.100-1.50
    These will be used for all devices attached (wired or wifi) to #2

    All systems can then use the firewall to allow or deny access for one or both halves of the network. EG: I permit access for 1-10 and 255 while denying 100-254​
    ALL system must allow the top-end address 255 as that is the broadcast address that is used to hand out the DHCP data.

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