Selfhosted
A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.
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Wow, I run opnsense in proxmox along with a pihole and a couple of other small services and never hit 100% CPU on an Intel N100. My miniPC box has 4 2.5 gigabit network ports though I only use 2 of them, one for LAN and one to the modem. I do also have a managed switch, though, that has a couple of 10 gigabit ports a couple of 2.5 and the rest 1. Likely the switch is taking some of load off of the router I suppose. Might try getting a low-end managed switch. If you're in the US do it quick, though as a lot of networking equipment is about to spike in price since the administration banned all new foreign made equipment and none is made I'm he US.
I have a smart switch. It has some managed features like VLANs and stuff like that but it’s not a full managed switch
If configured properly, it can usually bypass the router altogether. In my setup I have several VLANs for different traffic, so for me it's important to have a Layer 3 switch that can handle the routing between VLANS. But if you don't use VLANs, a layer 2 switch will build a mac address table and bypass the router once it knows where the traffic is going. That way only your DNS queries and similar get sent to the router for internal traffic on the LAN. Then the issue is just traffic going to the internet.
For the internet side you just need to configure the firewall to drop packets on ports (not reject, just drop/ignore) you don't use and use something like fail2ban or crowdsec to make your router outright drop malicious and LLM bot kinds of traffic to ports you do use that otherwise have to be processed. That generally will reduce processing load unless you have self-hosted services that really generate a ton of traffic in which case you can move those to VPSs outside of your network.
Those are my general strategies at a very high level.
I do use VLANs. But in testing even without them going laptop->server->WAN and nothing else it could not do it.