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Originally Posted by JohnHorb
Just to expand - in the case of the NTL setup, NTL provide the DHCP server, and addresses are leased for quite a time (don't quote me, but two weeks rings a bell).
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Lease times for full service IP addresses are 48 hours.
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Can DHCP allocate an IP address to an all-zeroes MAC address, and, if so, could this be causing a problem, e.g if there are other all-zero MAC addresses on the NTL network?
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This is theoretically possible, yes. If two devices on the same DHCP server have the same MAC address (in this case 00:00:00:00:00:00), things could be getting confused.