Why IP address is fixed everytime connected to the Internet?

I want to ask who assigns the IP address to a machine that connects to
the Internet? The ISP, the network card (i.e. MAC address??), or the
router?

It seems like my IP address is fixed everytime connected to the
Internet, it seems very unsecure because it allows hackers track the
computers more easily.

I thought the IP address should be dynamic, and each time when we
connect to the Internet should have different IP address.

Is there a way that makes the IP address in my machine becomes dynamic?

Please advise. thanks!!

(E-Mail Removed) wrote:
> I want to ask who assigns the IP address to a machine that connects to
> the Internet? The ISP, the network card (i.e. MAC address??), or the
> router?
>
> It seems like my IP address is fixed everytime connected to the
> Internet, it seems very unsecure because it allows hackers track the
> computers more easily.
>
> I thought the IP address should be dynamic, and each time when we
> connect to the Internet should have different IP address.
>
> Is there a way that makes the IP address in my machine becomes dynamic?
>
> Please advise. thanks!!
>
Nice crossposting!

Your ISP is assigning your Internet IP Address - You need a static
address if you are:
Hosting a mailserver
Hosting a website
Providing Dialin Access (VPN)

On 28 Sep 2005 07:52:23 -0700, (E-Mail Removed) wrote:
> I want to ask who assigns the IP address to a machine that connects to
> the Internet? The ISP, the network card (i.e. MAC address??), or the
> router?

Your ISP.


> It seems like my IP address is fixed everytime connected to the
> Internet, it seems very unsecure because it allows hackers track the
> computers more easily.

Cracker is not going to trust that is fixed. They will have code to
scan ip addresses so trying keep the ip address a secret is a waste of time.


> I thought the IP address should be dynamic, and each time when we
> connect to the Internet should have different IP address.

Your ISP decides if static or not and if dynamic, IP addy lease time.

> Is there a way that makes the IP address in my machine becomes dynamic?

If dynamic, you would have to stay off the net for the dhcp lease
time. Mine is 5 days before it expires. I would then have to wait for
another customer on my segment to let their lease expire and get my ip
or a new customer comes on line and gets my ip addy.

That is a waste of time.

Just set your firewall to block all incomming connections, do not run
browsers and whatnot as root, check everyday for updates from your
linux vendor and you will be supprised how safe you are.

"I want to ask who assigns the IP address to a machine that connects to the
Internet?"
Your ISP

"Is there a way that makes the IP address in my machine becomes dynamic?"
Ask your ISP.

--
Ted Zieglar
"You can do it if you try."

<(E-Mail Removed)> wrote in message
news:(E-Mail Removed) oups.com...
> I want to ask who assigns the IP address to a machine that connects to
> the Internet? The ISP, the network card (i.e. MAC address??), or the
> router?
>
> It seems like my IP address is fixed everytime connected to the
> Internet, it seems very unsecure because it allows hackers track the
> computers more easily.
>
> I thought the IP address should be dynamic, and each time when we
> connect to the Internet should have different IP address.
>
> Is there a way that makes the IP address in my machine becomes dynamic?
>
> Please advise. thanks!!
>

On 28 Sep 2005 07:52:23 -0700, (E-Mail Removed) wrote:

5 newsgroups crossposted. I guess a shotgun is more effective at
target practice.

>I want to ask who assigns the IP address to a machine that connects to
>the Internet? The ISP, the network card (i.e. MAC address??), or the
>router?

The limited supply of IP addresses were originally assigned by the net
gods. Through a covenant with various governments, the IANA was
empowered to distribute these IP's to the various ISP's in accordance
to an ordeal process which includes much petitioning, grovelling,
begging, and the inscription of forms. Your ISP then delivers unto
the multitudes a single IP address, which you are entitled to borrow
for the duration of your connection. Be thankful that they even have
IP's to give out.

>It seems like my IP address is fixed everytime connected to the
>Internet,

Better to have it fixed than to have it broken.

> it seems very unsecure because it allows hackers track the
>computers more easily.

No problem. Dive into your router and change the MAC address on the
"Clone MAC address" page. You can select almost any number you find
useful except that of the ISP gateway. Every time your change your
MAC address, disconnect, and reconnect, you'll get a new IP address.
Of course, this will drive your ISP's logs up the wall and suggest
that you're doing something evil and nefarious such as trying to hide
your tracks as a spammist. It will also cause him to perhaps run out
of available IP's as your previous IP addresses won't expire for quite
some time. Be prepared to get yelled at by your ISP.

>I thought the IP address should be dynamic, and each time when we
>connect to the Internet should have different IP address.

It can be. Some ISP's do that. However, it's usually not because
they are trying to enhance your security. It's because they simply
don't have enough IP's to handle all their customers and recycle them
often to other users. The limiting factor is the duration of the ARP
cache, which maps your MAC address to your IP address. You can see it
in Windoze if you run:
Start -> Run -> cmd<enter>
arp -a
Ping a few boxes and watch the numbers appear and disappear. To keep
the IP's stable, most ISP's run their ARP cache timeout at least 24
hours or more.

>Is there a way that makes the IP address in my machine becomes dynamic?
>
>Please advise. thanks!!

--
Jeff Liebermann (E-Mail Removed)
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

(E-Mail Removed) wrote:

> I want to ask who assigns the IP address to a machine that connects to
> the Internet? The ISP, the network card (i.e. MAC address??), or the
> router?
>
> It seems like my IP address is fixed everytime connected to the
> Internet, it seems very unsecure because it allows hackers track the
> computers more easily.
>
> I thought the IP address should be dynamic, and each time when we
> connect to the Internet should have different IP address.
>
> Is there a way that makes the IP address in my machine becomes dynamic?

The IP address is assigned by the ISP. Normally, with DHCP, you "own" the
address for the duration of the lease time. Part way through the lease,
your computer (or router) will attempt to renew the address. This means
that as long as you stay connected, you will likely retain the same
address. Your computer caches the address, so that if you turn it off and
later, back on, it will request the same address, if available. You might
be able to get a new address, if you release the IP and then get another
address, however that may not always work, as your ISP may also cache the
IP & MAC address pair, for at least the duration of the lease. If that's
the case, your only options for forcing a change, is to change the MAC
address of your hardware, or leave your equipment turned off long enough
for the lease to expire and the address be assigned to someone else.

Jeff Liebermann wrote:

> No problem. Dive into your router and change the MAC address on the
> "Clone MAC address" page. You can select almost any number you find
> useful except that of the ISP gateway.

Or one that's in use by someone else connected to the same ISP. Duplicate
MACs are a no-no.

Your ISP assigns it and it is not unusual to have the same IP for a long
time. Protect your computer/network with a properly configured firewall and
don't worry about it. Then take other steps as outlined in the link below
to protect your network as they are all important no matter what IP you have
or even if it changed daily. --- Steve

http://www.microsoft.com/athome/secu...2/Default.mspx
--- Protect your PC tips from Microsoft.

<(E-Mail Removed)> wrote in message
news:(E-Mail Removed) oups.com...
>I want to ask who assigns the IP address to a machine that connects to
> the Internet? The ISP, the network card (i.e. MAC address??), or the
> router?
>
> It seems like my IP address is fixed everytime connected to the
> Internet, it seems very unsecure because it allows hackers track the
> computers more easily.
>
> I thought the IP address should be dynamic, and each time when we
> connect to the Internet should have different IP address.
>
> Is there a way that makes the IP address in my machine becomes dynamic?
>
> Please advise. thanks!!
>

Steven L Umbach wrote:

> --- Protect your PC tips from Microsoft.

Tip #1 Forget Windows. ;-)

In comp.os.linux.networking Steven L Umbach <(E-Mail Removed)>:
> Your ISP assigns it and it is not unusual to have the same IP for a long
> time. Protect your computer/network with a properly configured firewall and

Ack.

[..]

> http://www.microsoft.com/athome/secu...2/Default.mspx
> --- Protect your PC tips from Microsoft.

Shouldn't that be, protect your PC from Microsoft? Good idea to
enhance security.

--
Michael Heiming (X-PGP-Sig > GPG-Key ID: EDD27B94)
mail: echo (E-Mail Removed) | perl -pe 'y/a-z/n-za-m/'
#bofh excuse 335: the AA battery in the wallclock sends
magnetic interference