A shell for vultr private network

init_private_network.sh

#!/bin/bash

private_network() {
  local PRIVATE_IP=$1
  if [ -f '/etc/sysconfig/network-scripts/ifcfg-eth1' ]
  then
    ifdown eth1 > /dev/null 2>&1
  fi
  cat <<EOF > /etc/sysconfig/network-scripts/ifcfg-eth1
DEVICE=eth1
ONBOOT=yes
BOOTPROTO=static
IPADDR=$PRIVATE_IP
NETMASK=255.255.255.0
MTU=1450
EOF

  ifup eth1
}

private_network 10.99.0.188

ip="10.99.0."
for i in `seq 10 100`
do
  ping -c 2 $ip$i | grep -q 'ttl=' > /dev/null
  if [ $? -eq 1 ]
  then
    private_network $ip$i
    echo "New private ip: $ip$i"
    break
  else
    echo "$ip$i exists"
  fi
done