Comcast IP Address

Posts: 30 · Vonage Forum Junior Joined: Sep 30, 2005 Posts: 30

i just relized something and i need a second opinion on this. last night, comcast was down at night for about 2-3 hours. after it came back up, my ip address changed from a 67.xx... to a 24.xx... address. iv relized before and am now that with a 24.xx address, my connection is slower than when i had a 67.xx address. why did my ip change? iv had the same ip for a LONG time and all of a sudden, it changes. i am behind the same router, same equiptment, same everything. the only thing that happend was that the IP changed. i want my 67 ip back. is there a way to get it back?

Posts: 114 · Posted: Thu Jun 15, 2006 6:49 am Post subject:

The simple answer is no, you can't get your former DHCP ip address back.

Comcast re-ips neighborhoods depending on network loads. If your neighborhood gained many subscribers and that sub was causing the connection to become overloaded, they break it apart into two subs. Or if a near by neighborhood had that problem, they may have split that into two parts, and joined your neighborhood with part of theirs. Who knows....

If you feel your performance is slow, go to dslreports and get a true reading of your upload and download speeds. If they're off, call up Comcast and explain to them the before and after numbers.

Strangely, when I put my WRT54G as the first connection off the cable modem, I get a 66.x address. When I put my RTP300 as the first connection, I get a 24.x address. I can't explain why that happens, but it's reproducable, and I don't notice any difference in speed.

-Craig

Posts: 40 · Full Forum Member Joined: Feb 21, 2005 Posts: 40

Quote:

can't explain why that happens, but it's reproducable

comcast's dhcp's leases are tied to the mac address of the device connected to the cable modem.

if your pc is connected directly to the cable modem, change its NIC and you will get a new IP address. or change it so that your Voip adapter / router is connected to the cable modem you will get a new ip address. of course, a reset of the cable modem must be done to flush the old MAC out of its memory.

Posts: 30 · Vonage Forum Junior Joined: Sep 30, 2005 Posts: 30

yes i have solved the problem. i relized this after changing 3 routers. put a netgear router, i get 24.xx put belkin, i get 67.xx, put linksys, i get a 71.xx. i have my option of what DHCP server to get my IP from now. Lol

i have a 71.xx now and its good. connection is still a bit on the slow side but i know why. there is an outage in my area and they have been working on it for about 2 weeks now but its seeming like its getting faster.