How to change a cable modem's IP address fast?

Toggle sidebar Toggle sidebar
T

tom2u

Distinguished
Aug 26, 2010
387
4
18,785
I'm on DSL now and its so easy to change the IP address by just using the modem's software to Disconnect then Connect which generates a new IP address in a few seconds.

But soon I'll have to switch to a cable modem and the only way I found before of changing the IP address was to unplug the LAN cable from the motherboard and plug it into a network card which produced a new IP address. If I stayed off the IP address of the motherboard for about 24 hours or more it would tend to give me a new one when I plugged it back in again. I'd love to be able to do this with the modem though. Wondering if this is possible.
 
Sort by date Sort by votes
B

bill001g

Titan
Aug 9, 2012
28,323
2,755
125,640
It not really the hardware platform that causes that. It depends how the ISP has set things up. You to a point are just lucky (if you like your ip changing) that the dsl does not change. The one in my rent house I needed to leave off for days to get the ip to change.

My current one has a sorta fixed ip. It will only change when they restart their service which only happens a couple times a year.

Cable modems have the additional issue that the modem itself is doing part of the security. It is mapping its mac address to the PC mac address. It is the cable modem mac that the ISP uses for security. This is why people have to reboot the modem when they plug one pc in and then change to another. I guess if you wanted to you could change the mac on your PC in the nic settings and then use a power strip that lets the PC turn the modem on and off. That would be your best bet to get a new ip......but you never really know it varies a lot from ISP to ISP

 
Upvote 0 Downvote
T

tom2u

Distinguished
Aug 26, 2010
387
4
18,785
My DSL IP can change because I log into the modem's software and change it. Otherwise I could just unplug it and when it reboots it seems to always have a new IP. Logging in is just far quicker. 5 seconds and Poof....I'm born again online.

I'd love to be able to do the same with my future cable modem service. Unplugging the network cable between network cards and the motherboard is a real hassle. And I have to use an IP from my local area so I can't use some foreign proxy server.
 
Upvote 0 Downvote
B

bill001g

Titan
Aug 9, 2012
28,323
2,755
125,640
I suspect he is talking wan address. Some DSL you can get to change the IP just by resetting it. I know of one guy whose business is dependent on that. He offers basically to spam craigslist with ads. To get around craigslist restrictions he keep multiple DSL connection in multiple hosting centers and constantly resets them.
 
Upvote 0 Downvote
Hawkeye22

Hawkeye22

Glorious
Feb 10, 2006
11,442
1
49,065
I've been on time-warner for at least 8 years now. The only time my IP changes is when they add a new node or make other changes on their network. Unplugging the modem for a day seems to do nothing. I suspect their DHCP lease times are turned up pretty high.

This is my experience with time warner in my location anyhow. Others may be different.
 
Upvote 0 Downvote
You must log in or register to reply here.

TRENDING THREADS

Latest posts

Moderators online

Share this page

COMPANY
RESOURCES
FOLLOW
Top Bottom