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 > *To:* Main PLUG discussion list > *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 > *To:* Main PLUG discussion list > *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 t o be > able to > > reset the ip# back to what it was? > > -- -Eric 'shubes' --------------------------------------------------- PLUG-discuss mailing list - PLUG-discuss@lists.plug.phoenix.az.us To subscribe, unsubscribe, or to change your mail settings: http://lists.PLUG.phoenix.az.us/mailman/listinfo/plug-discuss