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when ever i stop and start the vps it will change the IP.
how can i prevent it ?
Stop/start will change IP but reboot will not. Using Elasric IP is recommended or put your instance behind ELB.
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As mrclown said above ...You need to Allocate Elastic IP...Look on the side menu for NETWORK & SECURITY you will see the option to add Elastic IP to your region...this new IP will be static it wont change on a reboot...make sure you apply it to your instance