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Old 08-14-2003, 04:50 PM   #1 (permalink)
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How often does Comcast change your ip address?

Does anyone know?
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Old 08-14-2003, 05:06 PM   #2 (permalink)
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Location: Alexandria, VA
Explain "change your IP address". How do you connect, cable modem, DSL, or phone modem?

In any situation, network devices use a protocol called DHCP - this lets them set a "lease" time for the IP address assigned to your device. At the end of that lease time, if your device (modem/cable modem/DSL modem) isn't still active, it will give the IP address to someone else. Then, you'll get a new address next time you connect.

In most corporate situations, the lease time is very long (a day or more), because there are very few computers being removed or added to the network. For most ISPs (especially dial-up ISPs), the lease time can be as short as an hour.

That's how you get an IP address. As to "changing" it, I've no idea. Perhaps if you elaborate further, I can help more.
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Old 08-14-2003, 05:28 PM   #3 (permalink)
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Location: florida
with comcast basic service you get a dynamic ip. but ive had the same one ever since the @home->comcast swithover (quite a while) YMMV. i think comcast does offer a plan where they will guarentee your ip address for a certain amount time though. not sure the exact details.
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Old 08-14-2003, 05:38 PM   #4 (permalink)
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Well, if you never reboot your cable router and if it never loses power, you should (for the most part) be able to keep the same IP.

However, I'm not too familiar with the cable/DSL setups, as I'm not fortunate enough to have one.
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Old 08-14-2003, 09:04 PM   #5 (permalink)
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I've had the same IP address for the last two years - and comcast just took over AT&T here about 6 months. I'm still configured dynamically though.
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Old 08-15-2003, 07:14 AM   #6 (permalink)
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me too they rarely change
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Old 08-15-2003, 07:14 AM   #7 (permalink)
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I have had comcast/at&t for around 2 years now and have had at least 5 or 6 ips. I never really notice that quickly but it might be from loss of power or loss of cable which has happened many times during that time.
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Old 08-15-2003, 12:35 PM   #8 (permalink)
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My DSL connection sucks my ISP disconnects me every 24 hours so i have to reconnect and lease a new IP
 
Old 08-15-2003, 01:51 PM   #9 (permalink)
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Your ISP doesn't change your IP address, really.

If the ISP doesn't experience a problem (ie, if they don't have to restart the DHCP servers), then you'll keep the same IP address if you use your machine/modem often enough so that your IP 'lease' doesn't expire.

When you get a dynamic address, you have a 'lease time' on it. It's generally a day, 2 days, week, etc. If your modem/computer hasn't been active within that lease time, then you forfeit the address and it goes back to the pool. ISPs will adjust the time according to how many subcribers and IPs they have in the pool. They'll have a short lease time if they're 'tight' on IP addresses for the number of subcribers they have.

Under Windows 2000 (and probably XP) you can see your lease time via 'running' the command: "ipconfig /all"

By policy windows will 'renew' the lease when it's halfway expired. That way you'll tend to keep the same IP.


So, if the ISP doesn't restart their DHCP servers and you're not off-line (or if your modem doesn't get rebooted) for the entire lease period, you should retain your IP address.
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Old 08-15-2003, 03:16 PM   #10 (permalink)
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i just signed up with comcast like 2 weeks ago. still have the same ip address. i was with charter when i was in southern utah and i had the same ip address the whole time i was with them. i canceled and signed back up when i moved a couple times, but while i was signed up, (it was dynamic, not static) i had the same ip the whole time. i even hosted my website, ftp and email servers on it
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Old 08-15-2003, 04:57 PM   #11 (permalink)
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I've been with comcast for 6, and when they changed their IP block from AT&T's it changed. Other than that it's basically static.
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Old 08-15-2003, 05:53 PM   #12 (permalink)
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Well I just talked to my friend, and he says they change it every week. He says to type in ipconfig /all and look at where it says lease obtained and expires.
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Last edited by Jesus Pimp; 08-15-2003 at 05:56 PM..
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Old 08-15-2003, 10:40 PM   #13 (permalink)
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Location: Notre Dame
Just because your lease expires on an IP it doesn't mean you won't be able to obtain a new lease on the same IP. If he does an ipconfig /renew he'll renew his lease
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Old 08-17-2003, 05:32 AM   #14 (permalink)
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my ip address with comcast seems to change maybe once a month if that.
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Old 08-17-2003, 06:02 AM   #15 (permalink)
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Mine hasn't changed in 1 1/2 years
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Old 08-17-2003, 05:11 PM   #16 (permalink)
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I had my last ip for about 7-10 months and the previous one for about the same amount of time.

the reason i've lost then are
1) my machine was down for several days and the lease expired
2) cable got disconnected
3) comcast screwed up and had to reprovision my account

from what i can tell if you never loos your lease you should be able to keep the ip
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Old 08-18-2003, 06:13 PM   #17 (permalink)
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I'm simply curious as to why you would care whether or not your IP address was static or not. Unless you're planning on running a web site or an FTP site. If that's the case, you should simply pay for a static IP address from your ISP; it'll be a little more expensive a month, but you normally also get higher bandwidth for it...
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Old 08-19-2003, 02:59 PM   #18 (permalink)
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i've been with comcast for almost a year now. my ip address is still the same when i fist signed up
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Old 08-19-2003, 05:22 PM   #19 (permalink)
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Location: CA
I've had cable for a few years now, my ip has changed once just before comcast switched over to attbi, and it's stayed the same ever since.
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Old 08-20-2003, 03:45 PM   #20 (permalink)
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Location: Spokane, WA
Quote:
Originally posted by chewybaca96
i just signed up with comcast like 2 weeks ago. still have the same ip address. i was with charter when i was in southern utah and i had the same ip address the whole time i was with them. i canceled and signed back up when i moved a couple times, but while i was signed up, (it was dynamic, not static) i had the same ip the whole time. i even hosted my website, ftp and email servers on it

I work for comcast (and used to work for ATT Broadband)
so I find this just a bit difficult to comprehend.

Im not doubting that you hosting ftp or email servers but we block port 80.
unless you were hosting a website through a proxy/reroute or whatever. I just wonder.

its possible but ya make it sound just a little too easy for me. :P

PS dont harass me for free cable cuz the only thing I can do is give you cheap HBO if you live in washington.
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