forcing new dynamic ip address

Ernie Luzar luzar722 at
Sun Oct 8 12:42:12 UTC 2017

Erwan David wrote:
> Le 10/08/17 à 14:28, Ernie Luzar a écrit :
>> Hello List;
>> I have a "home service" account from my ISP. The ISP issues an dynamic
>> ip address which has not changed in 12 years.
>> My host has 2 NICs, one which is not used. I know if I plug the internet
>> cable into the un-used NIC and make the appropriate config changes and
>> reboot I will get a different dynamic ip address.
>> Is there a simpler way to expire the lease to force the ISP dhcp to
>> refresh with a different dynamic ip address?
>> The goal is to have a cron job that gets a different dynamic ip address
>> assigned to my host's front door every a week.
>> Just another level of security to make it very hard for the script
>> kiddies from finding any open ports I may have.
>> Thanks for the help.
> DHCP protocol states that the server should try to give you the same IP
> address. And dhcp servers keep track of the addresses they allocated in
> the past, to give them back if possible.

Yes I know that. The question is there a way to request their dhcp 
server to over ride that default behavior?

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