Dear Developers
Our students have met a feature of the DHCP server that can cause some
confusion.
If a NAT network is configured and a VM attached to that NAT network, then the
MAC address and allocated IP address are recorded in the lease file of that NAT
network (in order that the same IP address is reallocated). So far so good.
However, if the subnet address of the NAT network is later changed, the lease
file is not cleared, and a machine continues to receive the original (on the
old subnet) IP address. As this no longer matches the subnet address of the NAT
router, the VM is effectively isolated and cannot function on the network.
As a workaround I have suggested to the students that they should edit the
respective lease file. However, it would seem that the correct behaviour would
be for the lease file to be cleared (or alternatively the subnet address in the
lease file is changed to match the new subnet).
The problem for the students is that there is no outward indication of the
leases that exist and how to manage them (e.g. delete). I understand that there
should not be comprehensive DHCP management, however the behaviour should be
made consistent.
Regards
Malcolm
--
Malcolm Clarke BSc (Hons), PhD
Reader in Telemedicine and Data Communication Systems
T +44 (0) 1895 265053
Brunel University London
College of Engineering, Design and Physical Sciences
Department of Computer Science
HNZW010, Heinz Wolff Building, Kingston Lane, Uxbridge, Middlesex, UB8 3PH
www.brunel.ac.uk<http://www.brunel.ac.uk/>
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