Dynamic vs Static I/P with Comcast?

Dynamic vs Static I/P with Comcast?

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Subject Author Date
Dynamic vs Static I/P with Comcast? Bill Crocker 09-23-2006
Posted by Andrew Rossmann on September 24, 2006, 9:31 am
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[This followup was posted to comp.dcom.modems.cable and a copy was sent
to the cited author.]

@comcast.net says...
> Is Comcast assigning everyone static I/P addresses these days? I live in
> Macomb, Michigan and I've had the same I/P address for a very long time now.
> Powering the cable modem off, and on does not force a change...even if I
> leave it off for several hours. Is there a way to force a new I/P address?

As other posted, the IP address is roughly based on the MAC address
your computer or router passes on to the modem. Comcast tends to tie an
IP address to a particular modem MAC/computer MAC address for quite
awhile. It typically changes only if you change one of the MAC address,
stay offline for a very long time (I've been off for a few days and
still had the same address), or Comcast makes some structural changes in
their network.

The last time mine changed was a few months ago, when I went through
several address over a few days. This was just before they started there
'PowerBoost' feature.

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Posted by DLR on September 24, 2006, 4:45 pm
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Bill Crocker wrote:
> Is Comcast assigning everyone static I/P addresses these days? I live in
> Macomb, Michigan and I've had the same I/P address for a very long time now.
> Powering the cable modem off, and on does not force a change...even if I
> leave it off for several hours. Is there a way to force a new I/P address?
>
In very simple terms.

Dynamic vs. Static is an arrangement you have with the people upstream
from you.

If it's static it should not change without people getting involved and
coordinating it. I.E. the upstream has committed you'll get the same IP
until they change the deal with you.

If it's dynamic the upstream can change it anytime they want within the
rules of PPPoE, PPPoA, DHCP, or however your connection is made.

Now as a practical mater a static can change and a dynamic not change
give the above. It's up to the upstream.

For a variety of reasons, cable companies seem to not change dynamic IPs
very often, and many ILEC DSL providers seem to change them on a whim.

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other useful resources:
The Federal Communications Commission (FCC)
Telecommunications Industry Association
Electronic and Software Security Products and Services
International Telecommunication Union

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