Getting a new IP address?

[prettycoolguy]

Hi,
I've been trying all day to figure out how to get a new IP address. My ISP is Optimum. I used to be able to do it all the time with the linksis router I used to have - I would just change the last digit of the MAC address and reboot the router. But now I have this Optimum router manufactured by Sagemcom, and no matter what I do I can't seem to get a new IP. I'm not even sure if it will let me change the MAC address. To clarify, I want to change the IP that appears on the site whatismyip.com.

Would somebody please help me with this? Thank you.

 

[Fardringle]

Sometimes, with some ISPs, if you disconnect and power off the modem for a while (30+ minutes), it will reset the connection and give you a new IP. Some ISPs assign your modem a specific IP and you can't really change it unless they change it on their system.

But why do you need to change your IP address? Unless your IP has been banned from web sites because you were 'naughty', there's usually not any reason or need to do so.

 

[azazel1024]

No option in the router to release and renew the IP address? If not, then maybe/possibly removing power for half an hour might do it. If not try for 24 hours. If still not, than static IP address and you can't change it.

Just depends on how/where you are getting the IP address. Static you are SOL. Dynamic and you just either have to release and renew your IP hoping that your ISP will assign a new IP when you do that, or leave the thing unpowered for a period of time for your lease to expire and be assigned a new one.

Basically with the later stuff, you need the ISP to end up assigning out your current IP to some other bloke and then request a new IP reservation from their DHCP server. With an ISP, IPs probably get handed out often, so it shouldn't be a long wait, but it has to be beyond the end of your lease time. If it expired in 15 minutes, you might only have to wait 16-20 minutes to get a different IP. If it expires in 24hrs, you'd have to wait 24 hrs plus a few minutes.

Otherwise in most cases the DHCP server will reassign your current IP address to you when your lease expires and your router/modem requests renewal. So you have to break that cycle of renwal by being "offline" when the lease expires.

 

[ch33zw1z]

Remove power and signal cable (coax), and a battery if your unit has one. See if that helps.

Not really easy to change the IP that the ISP is giving you, but you can always use a vpn service like private internet access to give your computer a different WAN IP while you're dialed in.

 

[prettycoolguy]

Thanks for the replies.

I've tries keeping my router and modem unplugged for about 40-50 minutes at a time to no avail. I used to be able get a new IP by just changing the MAC address and resetting the router so I assume I have a dynamic IP, unless it got switched with a static one when I switched routers. VPN and proxies are really slow so I prefer to avoid those if possible.

 

[Red Squirrel]

Change your mac address and do a release/renew and you should get a brand new IP right off the bat. Technically don't really need to do a release, just a renew. The ISP DHCP server will see a request from a different mac address and not just reassign the same IP.

Edit: Oh wait, even changing mac address is not working? That is very strange then.

 

[prettycoolguy]

Change your mac address and do a release/renew and you should get a brand new IP right off the bat. Technically don't really need to do a release, just a renew. The ISP DHCP server will see a request from a different mac address and not just reassign the same IP.

Edit: Oh wait, even changing mac address is not working? That is very strange then.

Yeah, I don't see any options to change the MAC on my router's configuration menu. I tried using something called TMAC to change it, but it just changed my personal, internal MAC, not the public WAN one.

 

[prettycoolguy]

Nevermind, I called my ISP and it turns out I either have to leave it unplugged for like a week or get a different router. So I guess I'm getting a different router.
Thanks anyway guys.

 

[azazel1024]

That a damned long IP lease. Granted, consumer gear, but the longest I've ever seen on an appliance DHCP server is 48hrs.

IP release is if you are not doing a MAC address change first. Otherwise it just starts your existing lease over again. That and IP releases are for when you have MAC bound IP address assignment (probably calling it the wrong thing). For example my ONT box assigns a MAC bound IP address. You either have to do an IP release before changing routers, clone MAC address, or wait 0-24hrs for the last lease to expire.

 

[John Connor]

When I change the MAC address I also reset the modem. You don't reboot the router.