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Also for large farmer, how are you networking your farm?

Like this.  ;D
https://img.techpowerup.org/190610/image.jpg

You can try to take a look at some videos on youtube like this one https://www.youtube.com/watch?v=nXHAjBMLRqY
I thought that you can divided it and if you are using this mobo https://www.asus.com/id/Motherboards/B250-MINING-EXPERT/ and you can put up to 16 - 19 GPU to mine and try to combined it with some mining software and a little LCD to make you able to control your farm. I don't think if all those 500+ rigs are being putted in the same network.

if you don't know the answer to this then i hope to god you are not attempting this.

Multiple subnets (for easier management instead of a /23 or /22) instead of one giant one.  That way you can segment stuff out
linux os that handles a bunch from a central console
good router
good inet
yadda yadda

That's me in my basement.

Dude you need AwesomeMiner as soon as possible. This making managing them super easy! https://awesomeminer.pxf.io/JY15N

Multiple subnets, a good router/firewall and managed switches.  For large scale deployments you can't buy the good routers, firewalls and switches at best buy.

As far as managing the individual rigs hiveOS or one of the others multi rig management platforms. 

here the only option, through remote access, sitting at home near the fireplace with a laptop

Large miner don't adjust their rigs each of them, they create a system where they can adjust the whole rigs in 1-2 interface. Remember also that miner use GUI/CLI to control their rigs.

https://www.ui.com/unifi-switching/unifi-switch-16-xg/

Scroll down for example of how to support 500+ clients.
In this example, an aggregation switch and 12 x 48-port managed switches.

not sure if it’s possible at all without all the mumbo jumbo with multiple accounts, most powerful managers usually support 20 rigs tops.
it’s pretty handy though when there are built-in management features in the miner itself, like in my fav hive os https://hiveos.farm/

HiveOS hands down. Tried Ethos at first and Windows 10. Hive wins.
https://hiveos.farm/. Lots and lots of features, easy to use, setup, can remote thousands of rigs easily from anywhere on web interface. Constantly updating every miner. Free if less than 3 rigs. Stable.

You need two things : SimpleMiningOS also knows as smOS (a linux distro built for mining) and SimpleRigResetter (a hardware device built by the same guy that allows you to physically turn power on/off on all the rigs individually, as well as set rules like auto-reset power incase a miner hangs.

Running about 300 devices farm (mixed asic and gpu). Since this size farm is not big enough to start developing own software i would go with Hiveos or Awesomeminer. Someone mentioned already multiple subnets, thats one option and pretty easy to create with any good firewall (Sophos, Fortigate etc). Although do you really need this one if you are using Hiveos? Only thing you are in that case interested is that you will find the rigs easily, correct? Im assuming you are building GPUs only so you could just usb hiveos all the rigs , label them so its easy to find when there is error / need reboot or so. Also this way you dont need to care about LAN side ip-address , you can just go with DHCP provided by firewall or server if u like it more.

Also i would NOT chain any network switches even it can be tempting. Depending on your setup, get 24 or 48port switches and put cables to "main switch/switches" so in case some switch gets broken , overheated whatever it doest cut network from others.

Edit. and if you go with one big subnet, remember to create it big enough.. for example:

172.16.0.0/20 (mask 255.255.240.0) , you would end up with over 4000 free ip-addresses

I heard about the website minigrigrental, a great website to monitor your equipment. And speed lease