[Gllug] Detecting attempts to contact another machine and acting o

[John Hearns]

- Tethys wrote:
> On 3/13/07, John Winters <john at sinodun.org.uk> wrote:
> 
>> I still have this vague recollection of seeing a HowTo back in the dim 
>> and
>> distant past which had instructions for doing something very similar 
>> using
>> dummy IP addresses.  Each machine had its own real IP address, and then
>> another dummy address was allocated which both might pretend to be.  I
>> wish I could remember exactly where I saw it.
> 
> At a guess, probably here: http://www.linux-ha.org
> 
The heartbeat (linux-HA) package comes with two scripts, IPaddr and 
IPaddr2  which create an aliases interface, ie. you have two (more) 
machines with IPs and the 'service' IP is an aliased interface which is 
started on the primary machine, and on failover is started on the 
standby machine.
AFAIK, heartbeat does not listen for traffic on any of these 
interfaces. I could be wrong!

Don't let me put you off though  - this is a good idea.

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