IP assignment with ISPs

Hi,
I would like to ensure that whenever I log onto the internet from home
that my ISP assigns me a different IP address. Is it neccessary to
switch the modem off and on to ensure this happens? If I have a router
at home, is it neccessary to switch that on and off?
Thanks,
Phil

On 29 Nov 2005 05:42:07 -0800, (E-Mail Removed) wrote:

>Hi,
>I would like to ensure that whenever I log onto the internet from home
>that my ISP assigns me a different IP address. Is it neccessary to
>switch the modem off and on to ensure this happens? If I have a router
>at home, is it neccessary to switch that on and off?

Yes. The modem will hold onto the IP until the DHCP lease expires.

What are you trying to do?
Andrew.
--
Andrew Hodgson in Bromyard, Herefordshire, UK.
My Email: use <andrew at hodgsonfamily dot org>.

On Tue, 29 Nov 2005 17:18:59 +0000, in uk.telecom.broadband , Andrew
Hodgson <(E-Mail Removed)> wrote:

>On 29 Nov 2005 05:42:07 -0800, (E-Mail Removed) wrote:
>
>>Hi,
>>I would like to ensure that whenever I log onto the internet from home
>>that my ISP assigns me a different IP address.

This is virtually impossible - most ISPs have the DHCP lease time set
quite high, so even powering your modem down for 24 hours isn't
guaranteed to get it a new IP.

>Yes. The modem will hold onto the IP until the DHCP lease expires.

Which may be days...

>What are you trying to do?

This is a good question. Why do you care about getting a new IP every
day?
--
Mark McIntyre
CLC FAQ <http://www.eskimo.com/~scs/C-faq/top.html>
CLC readme: <http://www.ungerhu.com/jxh/clc.welcome.txt>

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On 29 Nov 2005 05:42:07 -0800, (E-Mail Removed) wrote:

>I would like to ensure that whenever I log onto the internet from home
>that my ISP assigns me a different IP address.

why ? something to hide ? ;-)

>Is it neccessary to
>switch the modem off and on to ensure this happens? If I have a router
>at home, is it neccessary to switch that on and off?

step 1 is to have an ISP that gives you a dynamic IP and not a static
one. Different ISPs have different policies, some have sticky dynamic
IPs that rarely change. Who you with ?

Phil
--
Tiscali - dialup speeds at Broadband prices, see
http://bbs.adslguide.org.uk/postlist...&Board=tiscali

AOL - the unlimited ISP of choice for heavy downloaders.

On Tue, 29 Nov 2005 17:18:59 +0000, Andrew Hodgson <(E-Mail Removed)>
wrote:

>DHCP lease expires.

DHCP ? not used on BT Wholesale ADSL, its a PPP negotiation.

Phil
--
Tiscali - dialup speeds at Broadband prices, see
http://bbs.adslguide.org.uk/postlist...&Board=tiscali

AOL - the unlimited ISP of choice for heavy downloaders.

"Mark McIntyre" (E-Mail Removed) wrote in message
news:(E-Mail Removed)
>
> This is virtually impossible - most ISPs have the DHCP lease time set
> quite high, so even powering your modem down for 24 hours isn't
> guaranteed to get it a new IP.

Think my record is 9 different IPs in 60 seconds courtesy of Pipex and an
iffy line.

On Tue, 29 Nov 2005 18:31:02 +0000, in uk.telecom.broadband , Phil
Thompson <(E-Mail Removed)> wrote:

>On Tue, 29 Nov 2005 17:18:59 +0000, Andrew Hodgson <(E-Mail Removed)>
>wrote:
>
>>DHCP lease expires.
>
>DHCP ? not used on BT Wholesale ADSL, its a PPP negotiation.

I don't think the protocol layer has anything to do with how IP
addresses are assigned. Different level in the network stack.
--
Mark McIntyre
CLC FAQ <http://www.eskimo.com/~scs/C-faq/top.html>
CLC readme: <http://www.ungerhu.com/jxh/clc.welcome.txt>

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On Tue, 29 Nov 2005 22:15:01 +0000, Mark McIntyre
<(E-Mail Removed)> wrote:

>On Tue, 29 Nov 2005 18:31:02 +0000, in uk.telecom.broadband , Phil
>Thompson <(E-Mail Removed)> wrote:
>
>>On Tue, 29 Nov 2005 17:18:59 +0000, Andrew Hodgson <(E-Mail Removed)>
>>wrote:
>>
>>>DHCP lease expires.
>>
>>DHCP ? not used on BT Wholesale ADSL, its a PPP negotiation.
>
>I don't think the protocol layer has anything to do with how IP
>addresses are assigned. Different level in the network stack.

PPP incorporates a series of negotiation phases. The first few frames
exchanged across the link are LCP - link control protocol - which
negotiate PPP options, things like maximum transmission units and
protocol field compression. After the standard options have been
agreed by both ends of the link, an authentication phase is entered
where (normally) the client is asked to identify itself and supply an
authentication token, such as a password or an encrypted token derived
from the password.

When LCP negotiation is complete, the link moves on to IPCP - internet
protocol control protocol - and this assigns IP addresses for each end
of the link. This is quite distinct from DHCP - dynamic host
configuration protocol - which isn't used on a PPP link.

Mike.

--
Entia non sunt multiplicanda praeter necessitatem

On Tue, 29 Nov 2005 22:15:01 +0000, Mark McIntyre
<(E-Mail Removed)> wrote:

>I don't think the protocol layer has anything to do with how IP
>addresses are assigned.

PPP session negotiation assigns the IP address etc, DHCP clients
aren't used on BT ADSL.

Phil
--
Tiscali - dialup speeds at Broadband prices, see
http://bbs.adslguide.org.uk/postlist...&Board=tiscali

AOL - the unlimited ISP of choice for heavy downloaders.

On Tue, 29 Nov 2005 22:38:30 +0000, in uk.telecom.broadband , Mike
<(E-Mail Removed)> wrote:


(stuff about PPP)

I sit corrected - at least till I can be bothered reading up on it
all!
--
Mark McIntyre
CLC FAQ <http://www.eskimo.com/~scs/C-faq/top.html>
CLC readme: <http://www.ungerhu.com/jxh/clc.welcome.txt>

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