Wired network fails after a while on the Pi 4

  • Symptoms:
    The Pi seemingly freezes up after about an hour (time varies), requiring hard reset.
  • Reality:
    dhcpcd crashed/froze and didn't restart, and the network config got removed from the interface.
    System can temporarily be recovered by statically assigning ip & route, or by running systemctl restart dhcpcd in a serial terminal or with a directly connected keyboard and mouse.
  • Workaround:
    Add the following to /etc/dhcpcd.conf: 
    # https://github.com/raspberrypi/linux/issues/4092/
denyinterfaces veth*
  • Raspberry Pi 4: DHCPCD route socket overflowed
  • Also tracked by Jeff Geerling: Pi drops IPv4 address after DHCP lease expires

Trace: • pi-issues

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