Shared IPv4 for VPS on Virtualizor or alternative set up

Comments

• BetaRacks Member

  June 2023

  #! /bin/bash
  echo -e "Please input your server main ip"
          stty erase '^H' && read -p "(such as 8.8.8.8):" main_ip
          [[ -z "${main_ip}" ]] && echo -e "cancel..." && exit 1
  echo -e "Please input how many /24 you want to use, max is 5"
          stty erase '^H' && read -p "(such as 1):" user_ip_num
          [[ -z "${user_ip_num}" ]] && echo -e "cancel..." && exit 1
  iptables -t nat -F
  iptables -t nat -A POSTROUTING -o eth0 -j SNAT --to ${main_ip}
  user_ip_head="10.0."
  for (( c = 1; c <= ${user_ip_num}; c++ ));do
      for (( d = 1; d <= 255; d++ ));do
          user_ip=${user_ip_head}${c}"."${d}
          if (("$d" < 10)); then
              ssh_port="6"${c}"00"${d}
              user_port_first=${c}"00"${d}"0"
              user_port_last=${c}"00"${d}"9"
          elif (("$d" < 100)); then
              ssh_port="6"${c}"0"${d}
              user_port_first=${c}"0"${d}"0"
              user_port_last=${c}"0"${d}"9"
          else
              ssh_port="6"${c}${d}
              user_port_first=${c}${d}"0"
              user_port_last=${c}${d}"9"
          fi
          iptables -t nat -A PREROUTING -i eth0 -p tcp -m tcp --dport ${ssh_port} -j DNAT --to-destination ${user_ip}:22
          iptables -t nat -A PREROUTING -i eth0 -p tcp -m tcp --dport ${user_port_first}:${user_port_last} -j DNAT --to-destination ${user_ip}
          iptables -t nat -A PREROUTING -i eth0 -p udp -m udp --dport ${user_port_first}:${user_port_last} -j DNAT --to-destination ${user_ip}    
      done
  done
  service iptables save
  service iptables restart
  echo -e "It seems done"
  

  this is an example of creating a nat forwarder
  enable your ipv4 forwarding
  then set ip 10.0.0.0/16 for your vps
• firstdigital77 Member

  June 2023

  Thank you so much @BetaRacks, advise appreciated.