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I am currently subscribed to 2 ISP lines, a cable (100mbps) and fibre (1gbps) connection. I also have 3 routers to cover my entire home, Dir-868L and 2x Dir-605L. My ideal state is, i can have specific devices like my desktop and some of my mobile devices to go onto the fibre gateway. I've tried using DHCP allocation on DIR-868L and DIR-605L to always allocate my desktop to 192.168.0.101, but it doesn't work when DIR-605L dhcp responds first.

My set-up is currently:

Cable (WAN) -> modem -> dir-605L router A (wifi & Lan) -> dir-605L router B(Wifi & to fibre router dir-868L via PoE)

Fibre (WAN) -> ONT -> dir-868L router C(wifi & Lan & connected to 2nd dir-605L via PoE)

Router A has DHCP enabled and ip pool is 192.168.0.1 - 192.168.0.99 Router B has DHCP disabled Router C has DHCP enabled and ip pools is 192.168.0.100 - 192.168.0.254

network

I've used https://creately.com/ to create this simple diagram.

I wanted to use DLNA but dir-605 doesn't allow static route to communicate cross subnets, dir-868L is supported by dd-wrt, but dir-605L isn't. Thus i am using 1 subnet instead.

Now i have a problem, both DHCP servers are racing to allocate IP and if i'm connected to 1 ISP e.g. fibre, i might actually get an IP from cable which is a lower bandwidth.

I've read that i can use VLANs but if i flash my Dir-868L to configure VLAN tagging, do i require the other 2 routers to be able to support it? Or should i buy a switch? Or should i re-do the network to simplify everything?

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  • You should be able to disable the DHCP server on all but one of the routers.
    – Ron Maupin
    May 3, 2016 at 2:34
  • The title sounds like a film I once saw...
    – Burgi
    May 3, 2016 at 2:36
  • if i disable 1 of the DHCP server, all traffic only goes via 1 of the WAN link?
    – Lee Gary
    May 3, 2016 at 2:42
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    You don't say in your question what behavior you actually want, only that you don't want to get a gateway randomly based on which DHCP server responds quickly. Please edit your question and include the desired outcome.
    – Paul
    May 3, 2016 at 2:44
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    If that last comment sounds like what you want, but the implementation described isn't clear just let me know and ill clarify it as an answer instead of comment. Just trying to figure out your goal.
    – Argonauts
    May 3, 2016 at 3:20

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