‘raspberry pi 3B disable ipv6’ Add ipv6.disable=1 to /boot/cmdline.txt
cat /etc/modprobe.d/ipv6.conf
Don’t load ipv6 by default alias net-pf-10 off
uncommented alias ipv6 off
added options ipv6 disable_ipv6=1
this is needed for not loading ipv6 driver blacklist ipv6
https://www.raspberrypi.org/forums/viewtopic.php?t=138899