Why do my local network ip addresses keep changing?

[Tim Bogart]

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 at yahoo.com>
To: Main PLUG discussion list <plug-discuss at 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 days.  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 at snaptek.com>
To: Main PLUG discussion list <plug-discuss at 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 at 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 to be able to
> reset the ip# back to what it was?
>
>
>
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