Remove all static DHCP leases on a Zyxel router

zyxel_clear_dhcp.sh

#!/usr/bin/expect
# Remove all static DHCP leases on a Zyxel router.
set timeout 10
set password "MY_PASSWORD"

spawn ssh -o HostKeyAlgorithms=+ssh-rsa -o PubkeyAcceptedAlgorithms=+ssh-rsa [email protected]
expect "password:"
send "$password\r"
expect "ZySH>"
for {set i 1} {$i <= 254} {incr i} {
  send "cfg static_dhcp delete --Index $i\r"
  expect "ZySH>"
}
send "exit\r"