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The original was posted on /r/selfhosted by /u/twitchnexq on 2025-03-27 23:43:44+00:00.
I learned the hard way that making a docker network (in portainer) and setting your actual subnet (example: 192.168.2.0/24) as a docker network will indeed mess with your router and the devices on it. Me not using a VLAN or custom router and just using ISP router… it would keep disconnecting family member(s) VPN for work. After 15 hours of troubleshooting my servers and services at home, finally discovered that having you’re real subnet as a docker network will indeed break your network and cause frequent router crashing making you think that your ISP is just sh*t. Even though I had a service on it at one point it still messed with things until I removed it completely. One small mistake made me question for an entire day what it possibly could be until I finally discovered the little error in docker that was causing the entire problem.
TL;DR: Do not use your subnet for docker networks, just use the defaults it gives you unless you know how they work :)