Home router help...

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Jack Coats

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May 10, 2021, 1:08:57 PM5/10/21
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I wonder if there is a limit on how many IP's that a router can handle.  I have just under 50 devices and my Asus RT-AX92U as a main router with 2 RT-AC68U as AIMesh nodes. 
We stream a tv and a couple of computers, a TV from Amazon (fire tv stick) with several misc devices, mainly Wyze devices.
Any suggestions of routers that can carry that?   My wan is a fiber coming in but delivered as ethernet. 250Mb sync that normally comes in close to that nicely.

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Tilghman Lesher

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May 10, 2021, 1:28:17 PM5/10/21
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Shouldn't be any limit other than the normal 253 limit for what most
of them configure for a /24. (256 minus 1 each for network address,
broadcast address, and router address). If the router lets you
specify the network, you should be able to do pretty much any number
up to 2^24 - 3, just by switching out the network.
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Gibson Prichard

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May 10, 2021, 1:36:08 PM5/10/21
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You may be hitting a limit of the NAT in the router (basically the size of the state table), and not the number of IP addresses that it can handle. I use pfSense at home with two access points with over 50 devices at times and everything works well. My guess is the Asus RT-AX92U may be running out of ability to keep up with all the states of traffic in and out, but a modern device like this shouldn't hit a limit with just 50 devices. That being said, if one or more of those 50 items act as a server with connections coming in from outside, you could be filling up a state table with all the incoming connections.
No promises on this, but it is a possibility. Look and see if the Asus RT-AX92U has an newer firmware or there are any notes about number of supported devices.

Gibson Prichard
Nashville, TN



On Mon, May 10, 2021 at 12:08 PM Jack Coats <ja...@coats.org> wrote:

Csaba Toth

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May 10, 2021, 2:44:31 PM5/10/21
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We might forget one important thing: static and dynamic IP ranges!
The routers usually serve 192.168.1.0/24 (or equivalent 24 bit mask) subnets. But the 256 IP is divided between static IPs and dynamic IPs.
Most commonly the DHCP server is configured to serve starting from the IP 100 and cover either 100 or 50 devices so 192.168.1.100-192.168.1.149 or 192.168.1.100-192.168.1.199 IP ranges.
I have a faint suspicion that in your case the DHCP server might be configured for 50 devices and you may hit that limit?

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Csaba Toth

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May 10, 2021, 2:58:12 PM5/10/21
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Off topic: speaking of Wyse...
During my CS studies the computer lab I visited usually was fully occupied with people playing Quake. I recovered and revived two Wyse 50 terminals (https://www.vecmar.com/products/productpage.asp?pid=525-Wyse_50_Terminals) from the junk corridor of the department, hooked them up (with proper serial VT connection to an old server) and set them up in a corner hidden by all the other electronics and furniture which were doomed to be thrown out. Some professors noticed I revived them, some students started to use them actively as well, professors were nostalgic and I earned some reputation. Those terminals were great as character terminals for emailing (do you remember pine email client?) or command line tasks even in 1996-1999 years, decades after the haydays of those Wyse 50s. I also earned reputation earlier as a freshman when I developed a Linux/UNIX compatible ASCII UI for the game of life semester work. Everyone was all about shiny GUI, my semester work also had GUI, but it could revert to ASCII.
I know your Wyse is not a terminal (or am I wrong?), but I got nostalgic...

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Jack Coats

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May 10, 2021, 3:07:03 PM5/10/21
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I remember old Wyze terminals. ... Not the Wyse devices I am talking about are IOT thingines, plugs, cameras, light bulbs, vaccums,  etc inexpensive vs the competition, that only seem to run in their private sandbox with very few 'outside' interfaces.  Sadly most of it is cloud based.

Jack Coats

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May 10, 2021, 3:08:01 PM5/10/21
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I have the latest firmware on my router.  And I have no clue about internal memory use.

Good catch on the NAT state tables, Gibson.




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Csaba Toth

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May 10, 2021, 3:18:17 PM5/10/21
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So once again: you can hit a 50 limit if the DHCP server is configured for a 50 device range instead of 100.

On Mon, May 10, 2021 at 12:07 PM Jack Coats <ja...@coats.org> wrote:
I remember old Wyze terminals. ... Not the Wyse devices I am talking about are IOT thingines, plugs, cameras, light bulbs, vaccums,  etc inexpensive vs the competition, that only seem to run in their private sandbox with very few 'outside' interfaces.  Sadly most of it is cloud based.

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Andrew Farnsworth

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May 10, 2021, 3:40:04 PM5/10/21
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If you want to test the static vs dynamic up range you should be able to determine via the routers interface what that is. Then setup a device using a static is outside the dynamic range (ie 192.168.1.77 if all other devices are 192.168.1.100+) and see if it works. Some routers I’ve seen don’t let you change the dhcp range you can use. I doubt this is the case here but it would be a quick and easy test

Andrew Farnsworth

On May 10, 2021, at 3:18 PM, Csaba Toth <csaba....@gmail.com> wrote:



Paul Boniol

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May 11, 2021, 3:03:52 AM5/11/21
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My first thought was that it was an old router that wasn't designed to handle lots of devices (I think that's the problem with the one I had gotten around 2016). What I'm seeing for that model says WiFi 6, so it should be built for "today's world" where you expect lots of devices. I concur with looking at the DHCP range configuration.

You don't say exactly what behaviour you're seeing, but I also strongly suggest hard wiring if possible, particularly to the mesh nodes. That is the most dependable.

Paul

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