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points by qlte 3 days ago | 0 comments

That is entirely ISP dependent and many don't actually work like that. Your cable modem gets a specific IP for as long as Comcast or whoever sees fit, restarting does nothing on the WAN side.

[–] consp 3 days ago

In my case a downtime of over 4 hours will switch it. Might just be lease time doing its job.

[–] Denatonium 2 days ago

On cable ISPs, oftentimes, changing the router's WAN interface's MAC address and then rebooting the modem will get you a fresh IP address, but rebooting the modem without first changing the router's WAN MAC address will get you the same IP address.

[–] drewnick 3 days ago

True, I've had the same IPv4 address since 2018 on Spectrum despite rebooting at least 10 times.

[–] prmoustache 3 days ago

This is simply called the dhcp lease time. Restarting has never forced a change of ip on a system using a dhcp client.