Plusnet Dynamic IP address

How 'sticky' is a Plusnet dynamic IP address, in people's experience ?


--
Mark
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On Sat, 03 Sep 2011 10:01:24 +0100, Mark Carver
<(E-Mail Removed)> wrote in <(E-Mail Removed)>:

>How 'sticky' is a Plusnet dynamic IP address, in people's experience ?

Not, in my experience.

I don't recall ever getting the same IP after a router reboot, power cut,
manual router disconnect/reconnect or suchlike. Rarely get the same gateway,
either.

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On Sat, 03 Sep 2011 13:45:17 +0100
Peter Boulding <(E-Mail Removed)> wrote:

> On Sat, 03 Sep 2011 10:01:24 +0100, Mark Carver
> <(E-Mail Removed)> wrote in
> <(E-Mail Removed)>:
>
> >How 'sticky' is a Plusnet dynamic IP address, in people's
> >experience ?
>
> Not, in my experience.
>
> I don't recall ever getting the same IP after a router reboot, power
> cut, manual router disconnect/reconnect or suchlike. Rarely get the
> same gateway, either.
>

Isn't there something dubious in the use of 'sticky' and 'dynamic' in
the same sentence? Pointless, maybe?
--
Davey.

On Sat, 3 Sep 2011 23:22:01 +0100, Davey <(E-Mail Removed)> wrote in
<j3u9a9$t2$(E-Mail Removed)>:

>> >How 'sticky' is a Plusnet dynamic IP address, in people's
>> >experience ?
>>
>> Not, in my experience.
>>
>> I don't recall ever getting the same IP after a router reboot, power
>> cut, manual router disconnect/reconnect or suchlike. Rarely get the
>> same gateway, either.
>>
>
>Isn't there something dubious in the use of 'sticky' and 'dynamic' in
>the same sentence? Pointless, maybe?

<thinks out loud>

Static IP: always the same.

Dynamic IP: allocated from a pool that, during any specific connection
attempt, may or may not include your last IP--according to rules that your
ISP will not divulge and which in all probability a maximum of one employee
fully comprehends.

Sticky IP: may change after a disconnect but often doesn't. Subset of
dynamic. The frequency with which the same IP as last time is chosen
determines the stickiness of a dynamic IP: the greater the frequency, the
stickier. If the same IP as last time is selected no more often than
probability theory predicts for random selection, your IP's stickiness is
zero--but, being unable to ascertain the required data, you'll never know
this.

Proviso: you can in theory achieve guaranteed zero stickiness by never
disconnecting except after changing ISP.


--
Regards, Peter Boulding
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Fractal Images and Music: http://www.pboulding.co.uk/
http://www.soundclick.com/bands/defa...&content=music

Davey wrote:
> On Sat, 03 Sep 2011 13:45:17 +0100
> Peter Boulding <(E-Mail Removed)> wrote:
>
>> On Sat, 03 Sep 2011 10:01:24 +0100, Mark Carver
>> <(E-Mail Removed)> wrote in
>> <(E-Mail Removed)>:
>>
>>> How 'sticky' is a Plusnet dynamic IP address, in people's
>>> experience ?
>> Not, in my experience.
>>
>> I don't recall ever getting the same IP after a router reboot, power
>> cut, manual router disconnect/reconnect or suchlike. Rarely get the
>> same gateway, either.
>>
>
> Isn't there something dubious in the use of 'sticky' and 'dynamic' in
> the same sentence? Pointless, maybe?

No..some people seem to reassign them on the basis that if you had it
last & if its free you get it again.


Others simply seem to rotate them through a FIFO queue. The one address
you WONT get is the last one you had..

Peter Boulding wrote:
> On Sat, 3 Sep 2011 23:22:01 +0100, Davey <(E-Mail Removed)> wrote in
> <j3u9a9$t2$(E-Mail Removed)>:
>
>>>> How 'sticky' is a Plusnet dynamic IP address, in people's
>>>> experience ?
>>> Not, in my experience.
>>>
>>> I don't recall ever getting the same IP after a router reboot, power
>>> cut, manual router disconnect/reconnect or suchlike. Rarely get the
>>> same gateway, either.
>>>
>> Isn't there something dubious in the use of 'sticky' and 'dynamic' in
>> the same sentence? Pointless, maybe?
>
> <thinks out loud>
>
> Static IP: always the same.
>
> Dynamic IP: allocated from a pool that, during any specific connection
> attempt, may or may not include your last IP--according to rules that your
> ISP will not divulge and which in all probability a maximum of one employee
> fully comprehends.
>
> Sticky IP: may change after a disconnect but often doesn't. Subset of
> dynamic. The frequency with which the same IP as last time is chosen
> determines the stickiness of a dynamic IP: the greater the frequency, the
> stickier. If the same IP as last time is selected no more often than
> probability theory predicts for random selection, your IP's stickiness is
> zero--but, being unable to ascertain the required data, you'll never know
> this.
>
> Proviso: you can in theory achieve guaranteed zero stickiness by never
> disconnecting except after changing ISP.
>
>
No, the case of you BEING DISCONNECTED by something else, persists.

Mate on LLU talktalk..never rebooted router. Used to be about 3-5
different IP addresses every DAY.

In article <(E-Mail Removed)>, Peter Boulding
wrote:
> Dynamic IP: allocated from a pool that, during any specific connection
> attempt, may or may not include your last IP--according to rules that your
> ISP will not divulge and which in all probability a maximum of one employee
> fully comprehends.

Plusnet used to have a stated policy of issuing static IP addresses to anyone
who could explain why they needed one, which seems perfectly reasonable.

> Sticky IP: may change after a disconnect but often doesn't. Subset of
> dynamic. The frequency with which the same IP as last time is chosen
> determines the stickiness of a dynamic IP: the greater the frequency, the
> stickier. If the same IP as last time is selected no more often than
> probability theory predicts for random selection, your IP's stickiness is
> zero--but, being unable to ascertain the required data, you'll never know
> this.

I think what you have in mind is the "DHCP lease time", which is the amount
of time for which an IP address is held for re-use by a particular client
while disconnected before it is freed for use by others. On a direct cable
broadband connection the results from "ipconfig /all" should include the
expiry time of the lease, and on an ADSL connection there's usually a status
page in the modem/router which will show the same information. Different ISPs
probably set it to different values depending on what they think works best
but it's not Top Secret.

Rod.
--
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On Sun, 04 Sep 2011 11:10:50 +0100, Roderick Stewart
<(E-Mail Removed)> wrote in
<(E-Mail Removed) en.co.uk>:

>I think what you have in mind is the "DHCP lease time", which is the amount
>of time for which an IP address is held for re-use by a particular client
>while disconnected before it is freed for use by others. On a direct cable
>broadband connection the results from "ipconfig /all" should include the
>expiry time of the lease, and on an ADSL connection there's usually a status
>page in the modem/router which will show the same information. Different ISPs
>probably set it to different values depending on what they think works best
>but it's not Top Secret.

<clickety>
ipconfig /all

Ooh: so it does:

Lease Obtained. . . . . . . . . . : 04 September 2011 10:43:16
Lease Expires . . . . . . . . . . : 05 September 2011 10:43:16

So: it looks like it's 24 hours sticky, which sounds pretty viscous to me.
But: the same command also tells me that my IP is 192.168.0.2--which is the
LAN address of my Ethernet card--and the IP of the default gateway and DCHP
server is 192.168.0.1, which is my Netgear ADSL router.

<opens router's browser-based interface>

My current Plus Net-assigned internet IP, on the other hand, is
84.51.188.141 .

<tells router to disconnect>
<tells router to reconnect>

Yep--my internet IP has changed.

Not so sticky after all.


--
Regards, Peter Boulding
(E-Mail Removed) (to e-mail, remove "UNSPAM")
Fractal Images and Music: http://www.pboulding.co.uk/
http://www.soundclick.com/bands/defa...&content=music

On Sun, 04 Sep 2011 00:37:14 +0100, The Natural Philosopher wrote:

> Davey wrote:
>> On Sat, 03 Sep 2011 13:45:17 +0100
>> Peter Boulding <(E-Mail Removed)> wrote:
>>
>>> On Sat, 03 Sep 2011 10:01:24 +0100, Mark Carver
>>> <(E-Mail Removed)> wrote in
>>> <(E-Mail Removed)>:
>>>
>>>> How 'sticky' is a Plusnet dynamic IP address, in people's experience
>>>> ?
>>> Not, in my experience.
>>>
>>> I don't recall ever getting the same IP after a router reboot, power
>>> cut, manual router disconnect/reconnect or suchlike. Rarely get the
>>> same gateway, either.
>>>
>>>
>> Isn't there something dubious in the use of 'sticky' and 'dynamic' in
>> the same sentence? Pointless, maybe?
>
> No..some people seem to reassign them on the basis that if you had it
> last & if its free you get it again.
>
>
> Others simply seem to rotate them through a FIFO queue. The one address
> you WONT get is the last one you had..

It'll depend, at least partly, on the size of the address pool and the
number of clients. I told that on Be the dynamic addresses are very
sticky, but I can't tell as I have a static IP.
I thought that some dhcp servers had an option to force dynamic addresses
to be different at 'renewal', but I can't see any such option from
looking at 'man dhcpd.conf'.

In article <j3vvs7$tf$(E-Mail Removed)>,
Andrew Benham <(E-Mail Removed)> wrote:
>On Sun, 04 Sep 2011 00:37:14 +0100, The Natural Philosopher wrote:
>>
>> Others simply seem to rotate them through a FIFO queue. The one address
>> you WONT get is the last one you had..
>
>It'll depend, at least partly, on the size of the address pool and the
>number of clients. I told that on Be the dynamic addresses are very
>sticky, but I can't tell as I have a static IP.
>I thought that some dhcp servers had an option to force dynamic addresses
>to be different at 'renewal', but I can't see any such option from
>looking at 'man dhcpd.conf'.

I think it's more the case that some DHCP servers *kofMicrosoft*kof*
don't care about trying to give persistent dynamic addresses. ISC dhcpd
does try to keep the MAC to IP mappings constant, if it can. If an
ISP used 10.*, say, they could support 16 million customers without any
address churn. I'm not familiar with ISP-grade kit though, and it does
depend as you say on the pressure in the allocated pool.

Nick
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