Date: Sun, 08 Oct 2017 19:58:16 -0400 From: Ernie Luzar <luzar722@gmail.com> To: Mike <the.lists@mgm51.com> Cc: freebsd-questions@freebsd.org Subject: Re: forcing new dynamic ip address Message-ID: <59DABB98.6040009@gmail.com> In-Reply-To: <259de481-2286-589f-ae18-8922d473813e@mgm51.com> References: <59DA19E8.5000602@gmail.com> <259de481-2286-589f-ae18-8922d473813e@mgm51.com>
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Mike wrote: > On 10/8/2017 8:28 AM, Ernie Luzar wrote: >> 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. > > > I have a few old NICs that i keep, not because I need to use them, but > because i want to be able to use their MAC address. > > Then I use one of the MAC addresses in rc.conf, e.g., > > ifconfig_em0="DHCP lladdr yo:ur:MA:C:ad:dr:es" > > My ISP assigns a new IP address when the DHCP server sees a new MAC address. > > Thank you. This is the solution I was looking for. I tested it and it works. But I have to first cycle the cable modem's power off/on to signal the isp network that new hardware is being used and prepare to do dhcp function.
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