package/base-files/files/etc/uci-defaults/12_network-generate-ula

   1 [ "$(uci -q get network.globals.ula_prefix)" != "auto" ] && exit 0
   2
   3 r1=$(dd if=/dev/urandom bs=1 count=1 |hexdump -e '1/1 "%02x"')
   4 r2=$(dd if=/dev/urandom bs=2 count=1 |hexdump -e '2/1 "%02x"')
   5 r3=$(dd if=/dev/urandom bs=2 count=1 |hexdump -e '2/1 "%02x"')
   6
   7 uci -q batch <<-EOF >/dev/null
   8         set network.globals.ula_prefix=fd$r1:$r2:$r3::/48
   9         commit network
  10 EOF
  11
  12 exit 0
  13