On Mon, Oct 06, 2014 at 02:22:42PM +0200, Ralf Corsepius wrote:
> On 10/06/2014 01:02 PM, Angelo Moreschini wrote:
> That's not unusual with DHCP. DHCP assigned IP-addresses usually
> have limited life-time until they expire. After expiration machines
> may be assigned a new IP-address.
However, I will point out that DHCP servers _tend_ to reassign the same
IP address to a machine renewing its lease. If you're seeing the address
change frequently, I would also wonder if there are dueling DHCP servers
on the segment. Determine what should be the definitive DHCP server and
make sure nothing else thinks it is also a DHCP server (e.g., other
computers, a firewall/router appliance, etc.)
> If you want to access a machine under a static IP-address, you'd
> have to set up your DHCP-server accordingly. How to do so would
> depend upon you DHCP-server's implementation.
Well, actually, there are a couple of approaches:
o A DHCP server should be configured to only use a portion of the
available IP address range for the subnet. For instance, if you're
using a RFC1918 IPv4 subnet of 192.168.100.0/24, it would be common to
restrict DHCP to the range 192.168.100.100-199. Anything below or
above that range is available for static assignment.
o You can reserve IP addresses within the DHCP pool by MAC address.
This is usually used when you've a legacy IP assignment that is in
the DHCP pool and, for whatever reason, is difficult to change.
Cheers,
--
Dave Ihnat
dihnat@xxxxxxxxxx
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