Re: Why do my local network ip addresses keep changing?

Yes, it's called a lease.
See http://www.ipcop.org/1.4.0/en/admin/html/services.html#services_dhcp
for a look at how DHCP services are configured on IPCop. You can scroll
down a little for the part pertaining to fixed leases.

Tim Bogart wrote:
> I could be wrong about it being called a license. On second thought, I
> think it's called a "lease."
>
> t
>
> ------------------------------------------------------------------------
> *From:* Tim Bogart <timbogart@yahoo.com>
> *To:* Main PLUG discussion list <plug-discuss@lists.plug.phoenix.az.us>
> *Sent:* Fri, October 1, 2010 9:40:41 PM
> *Subject:* Re: Why do my local network ip addresses keep changing?
>
> Brian is absolutely right and I concur 100%. However, more to your
> question, Joe, They might change addresses once in a while because they
> are inactive for a time and which ever box is acting as your dhcp server
> is putting that address back in to the pool of available IP addresses.
> Normally, dhcp will see the mac address of your network interface card
> (nic) and see if your previous address is available and if it is, will
> issue it to that machine again. The duration of the time an ip address
> will be assigned to any particular machine is determined by a
> programmable variable called the "license". The administrator is the
> one who determines this duration. Normally it's a matter of da ys.
> Usually three days is the shortest. The longest? Who knows. It's up
> to the administrator. But that's why they are changing on you. Again,
> unless you have a small IP address pool available to you, which you do
> not if you are using a private ip range as stated in the RFC's that
> pertain to TCP/IP and dhcp, then just go into your network settings, set
> them to static, lean back and cruise. Then they will never mysteriously
> change on you again. They will remain the same for ever and ever and
> ever...etc...etc.
>
> Tim
>
> ------------------------------------------------------------------------
> *From:* Brian Cluff <brian@snaptek.com>
> *To:* Main PLUG discussion list <plug-discuss@lists.plug.phoenix.az.us>
> *Sent:* Fri, October 1, 2010 9:23:11 PM
> *Subject:* Re: Why do my local network ip addresses keep changing?
>
> DHCP usually tries to keep the same IP address if possible, so unless
> you have more computers than you have IP addresses available, my guess
> would be that you have second DHCP server handing out IP addresses and
> your computers are bouncing back and forth between the one you mean to
> use and the rogue DHCP server.
>
> Brian Cluff
>
> On 10/01/2010 05:04 PM, joe@actionline.com <mailto:joe@actionline.com>
> wrote:
> >
> > I have four computers on my local network, 3 of which access by wireless.
> > While most will go along working fine for a while, occasionally the ip
> > number changes on some of them.
> >
> > Why does that happen and is there any way to prevent that or t o be
> able to
> > reset the ip# back to what it was?
> >


--
-Eric 'shubes'

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