Scripts to support IPv6 networking in Debian pre-boot (initramfs) environment

It is initial forked from https://gist.github.com/zajdee/65aad61f35d3a63c56c7d1cc76c22e14 (thanks @zadjee)

• Copy debian-initramfs-ipv6-premount-script to /etc/initramfs-tools/scripts/init-premount/
• Edit GRUB kernel boot parameter

# /etc/default/grub
# ...

GRUB_CMDLINE_LINUX="ipv6=addr=<address>/<netmask>,gw=<gateway>,iface=<interface>,forwarding=<0/1>,accept_ra=<0/1/2>"

# ...

• Update initramfs and grub

update-initramfs -u 
update-grub