So in the meantime it still happens when I work a lot on the server. So my newest theory is I have to increase net.core.netdev_max_backlog and txqueuelen as mentioned here https://linuxcontainers.org/lxd/docs/master/production-setup.
When running tcpdump on host’s eth0 I see a lot of packets being sent to the server with me just hitting the save button inside a program once… So I thought that the connection interruption comes from the queue being too small and me sending too much packets for it. Appears logical that my connection then gets dropped, but why does the server need 5 minutes or more to give Cloudflare back the connection to my ip address while others can still connect without problem? What do you think?
To make ip link set eth0 txqueuelen 10000 persistent in Ubuntu 20.04 with netplan and systemd I read you need a udev rule:
Make file:
/lib/udev/rules.d/60-persistent-txqueuelen.rules
Put in the file:
KERNEL=="eth[0,1]", RUN+="/sbin/ip link set %k txqueuelen 10000"
Run:
sudo udevadm trigger
Regarding the “Server Changes” before that, do I need to set them? How do I check which values the kernel is using right now?