Daisy chaining routers

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Pilly
DD-WRT Novice


Joined: 23 Jun 2019
Posts: 3

PostPosted: Wed Jul 03, 2019 7:33    Post subject: Daisy chaining routers Reply with quote
Please excuse what might be a novice question. I am wondering if I can daisy chain routers and still use dd-wrt effectively, i.e. connect a dd-wrt compatible wi-fi router to my existing router.

The reason I am thinking of this, is that my existing router is an LTE/4G router using a SIM (I lived on a boat, and now I'm back on land the available speed in my area is relatively poor - 10 Mbps).

There are some LTE/4G models supported by openWRT but 2 are Chinese hardware that a friend advised me against (suggesting the hardware might not support the full feature set), one is a dongle and one is a D-link router I am considering.

I would rather use dd-wrt but can find no supported LTE/4G router. Searching on the forums, there are suggestions to use an LTE dongle and plug into a dd-wrt compatible router. I am guessing I would get better connection and speed from my current 4G/LTE TP-Link router though and so would like to keep using it if possible.

Hence wondering if I can install dd-wrt on a suitable router, connect it (LAN to WAN socket?) by ethernet to my current LTE/4G router, and have all my home devices then connect to this inner/dd-wrt router.

I am unsure if daisy chaining the routers like this would work, and if putting dd-wrt on the inner router and not the outward facing/internet connected router would limit the usefulness or functionality of the dd-wrt install?

I did make an effort to look on the forums for this into but relevant sounding posts quickly got technical in a way I didn't fully understand!

Any advice on this much appreciated.
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egc
DD-WRT Guru


Joined: 18 Mar 2014
Posts: 12917
Location: Netherlands

PostPosted: Wed Jul 03, 2019 9:02    Post subject: Reply with quote
You can daisy chain without a problem be sure that your primary LTE router has a different IP subnet from your DDWRT router.

There are drawbacks but for normal use it is no problem

_________________
Routers:Netgear R7000, R6400v1, R6400v2, EA6900 (XvortexCFE), E2000, E1200v1, WRT54GS v1.
Install guide R6400v2, R6700v3,XR300:https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=316399
Install guide R7800/XR500: https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=320614
Forum Guide Lines (important read):https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=324087
Pilly
DD-WRT Novice


Joined: 23 Jun 2019
Posts: 3

PostPosted: Thu Jul 11, 2019 9:31    Post subject: Reply with quote
egc wrote:
You can daisy chain without a problem be sure that your primary LTE router has a different IP subnet from your DDWRT router.

There are drawbacks but for normal use it is no problem


Thanks EGC. I have got a small travel router to experiment with and am trying to make a logical map of the network and going over my subnetting theory.

I'm not sure if I should have:

LTE router 192.168.1.1 /24 ==Ethernet LAN to WAN sockets== dd-wrt router 192.168.2.1 /24
255.255.255.0 ====================================== 255.255.255.0

or

LTE router 192.168.1.1 /24 ==Ethernet LAN to WAN sockets== dd-wrt router 192.168.1.129 /25
255.255.255.0 ====================================== 255.255.255.128

The first would put them on different networks, but the second would put the dd-wrt router on a subnet, which I would then connect all my devices to? I should set static addresses for both routers, disable DHCP on the outer/LTE router and allow dynamic DHCP on the inner/dd-wrt router?

I feel this is basic stuff but am still learning networks!
egc
DD-WRT Guru


Joined: 18 Mar 2014
Posts: 12917
Location: Netherlands

PostPosted: Thu Jul 11, 2019 9:43    Post subject: Reply with quote
Only the first one works just put them on their own subnet with both DHCP etc.

Alternatively if you want one subnet you can setup like this: https://wiki.dd-wrt.com/wiki/index.php/Wireless_Access_Point

You have one subnet but the DDWRT router is just an access point everything else is done by the LTE router

_________________
Routers:Netgear R7000, R6400v1, R6400v2, EA6900 (XvortexCFE), E2000, E1200v1, WRT54GS v1.
Install guide R6400v2, R6700v3,XR300:https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=316399
Install guide R7800/XR500: https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=320614
Forum Guide Lines (important read):https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=324087
Pilly
DD-WRT Novice


Joined: 23 Jun 2019
Posts: 3

PostPosted: Thu Jul 11, 2019 10:22    Post subject: Reply with quote
Thanks egc. Lots of useful info in that link. And better, more precise ways to describe things too! e.g. "a gateway router that is downstream of a primary gateway router".

Much appreciated.
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