Pi-hole Performance check for an ISP!

[MrJwan]

The issue I am facing:
Hello
I am using Pie-hole as a local DNS and Ad-blocker since 2 months now
I would like to share my piehole performance and I wonder if My setup can really handle what i am giving , as I am connecting around 4000 users through 14 Routers to my Single Piehole - please Advice me if there is anything i am Missing ?

Details about my system:
I am using Piehole on Centos7 on Promox .

What I have changed since installing Pi-hole:

1. I increase my DNS cache size: 400000
2. I added a blacklist for adult filtering which is :
   `https://raw.githubusercontent.com/chadmayfield/pihole-blocklists/master/lists/pi_blocklist_porn_top1m.list
3. I used 1.1.1.3 Cloudflare server - as an upstream dns I hope that is not a bottle neck !
   4.Listen on all interfaces, permit all origins in interface listening behavior as my Piehole is under NAT !
4. please check my screenshots . and thanks for reading and commenting in advance !

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[jfb]

@MrJwan

I am connecting around 4000 users through 14 Routers to my Single Piehole

How are you controlling access to the Pi-hole? Is this being run as an open resolver, or in a LAN environment?

[MrJwan]

I am using my pie-hole local IP address as a main dns in my 14 main routers !
So all my routers + my pie-hole server are in a LAN Environment !
Do you have a similar project ?

PS : If i force all my dns (53 port) to my pie-hole I think it gets jammed some how ! and my pie hole server freezes as instead of 12 main routers query , It start getting 4000 Clients Query and that make the server kinda crush !