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@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 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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