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I'm running out of ethernet ports on my router and don't want to use WiFi.

One rig is on WiFi and loses connectivity sometimes.

Please recommend.

Netgear ProSAFE web managed switches are reasonably priced and come in variety of port configurations, are plug-and-play but also support additional configuration and monitoring features with an easy web-based configuration. All ProSAFE switches have a lifetime warranty with next business day replacement. Highly recommend.

https://www.netgear.com/business/products/switches/smart/standalone-smart-switch.aspx#tab-models

Before you expand on to building more rigs, i would highly recommend first making sure that your mining rigs are running with optimal setups.

I consider mining rigs with less than 13-GPUs per motherboard to be inefficient, regardless of your power consumption (because you are also paying for fixed costs of the motherboard, cpus, ssd, etc). Make sure you have at least 13-GPUs per mother or even better if you can some 19-GPU builds running (ASUS motherboard with mining ed. GPUs).

If you are really cheap like me instead of spending money on a switch with like 20 ports you can just hook up old routers together.

I have a bunch of old wifi routers where the wifi went bad but the Ethernet still worked. Basically you plug one into the other and set a subnet mask and each router will give you 3 extra connections (since 4th is required for subsequent router connections)

Never had any issues except tons of wires everywhere.

I too have used this method with my old D-Link routers, the process is some and cheap, but I've faced lags at times. The repeaters have to be new for better use I guess.

Have you faced this issue too?

A cheap $20-30 8 port gigabit switch is dead simple to setup.  Just connect one port to your WiFi router and you now have 7 gigabit ports to use for expansion or to get that rig off WiFi.  You are introducing unnecessary latency between that rig and the pool which can and does affect the shares that are able to be submitted.

Which way is introducing unnecessary latency?

I just ordered one of these NETGEAR 8-Port Fast Ethernet Unmanaged Switch, Desktop, ProSAFE Lifetime Protection (FS108NA)
https://www.amazon.com/gp/product/B00002EQCS/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1

Considering the fastest internet speed in my area (actually quite slow) 10Mbps down/1Mbps up ; I figured it would be perfect for my needs.

Using WiFi introduces latency.

No there is no lag what so ever.

I've measured and it's at most 10ms lag which is very negligable. Depending on what pool you use you can probably get a closer pool and it will not have an effect.

Wifi is not good for mining rigs due to the noise they set off. You will get too many dropped connections.

I run my stuff on pfsense on top of this: https://www.amazon.com/Qotom-Q355G4-Firewall-Ethernet-Barebone-Computer/dp/B06XJV9R8X/ref=sr_1_4?ie=UTF8&qid=1527708095&sr=8-4&keywords=qotom

Multiple subnets and load balancing with multiple WAN/VPNs and is working flawlessly. I came from custom Merlin sw on my ex Asus router, and I would never go back, just for snort, pfblocker, traffic shaper, etc

My WiFi system sometimes just doesn't connect to the network when the system is restarted until I unplug the WiFi adapter and reconnect it.

That's why I'm wanting a hardwired connection.