DHCP code in 2.0.4+

Arran Cudbard-Bell A.Cudbard-Bell at sussex.ac.uk
Tue Jun 9 15:53:00 CEST 2009

On 9/6/09 14:20, Karl Auer wrote:
> On Tue, 2009-06-09 at 14:07 +0100, Arran Cudbard-Bell wrote:
>>>>     See earlier messages in this thread.  I (a) found a theoretical issue
>>>> with the protocol, and (b) demonstrated it in a live system.
>>> I missed it. What was it again?
>> When we tried it back in 2007 with an Active/Active configuration, the
>> two instances of ISC DHCPD started handing out duplicate leases
>> completely arbitrarily. We scrapped the second instance and went
>> down to a single one. Haven't tried it again since.
> Thanks - but that's not a theoretical problem (necessarily). I'm
> interested in the protocol itself; Alan has been talking about an error
> in the protocol which would lead to failure *even if the protocol were
> implemented correctly*.
> What does "Active/Active" mean? Presumably not the same as
> "primary/primary", which would be a configuration error...

With a pair of servers running Active/Active means that both servers participate at the same time. In ISC terms this would be 'load sharing'.

Active/Passive generally refers to some kind of redundancy arrangement.

Arran Cudbard-Bell (A.Cudbard-Bell at sussex.ac.uk),
Authentication, Authorisation and Accounting Officer,
Infrastructure Services (IT Services),
E1-1-08, Engineering 1, University Of Sussex, Brighton, BN1 9QT
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