> 
> Also, could you explain how it is possible to use a different address than 
> the 
> one which is "assigned" to your computer?
> 

In most shops, in almost all but the most basic configurations, the
generally accepted practice is to create abstraction between the
"system" and the "service" provided by it.  Even if a system has a
single service/function, it still binds the service to a "Service VIP",
or "IP Alias (BSD)".

I.e., almost all machines have a "Management Address" and "Service VIP",
especially in non-RFC1918-space-only shops.

To give you an idea why this is a policy in most places: For example, if
a system crashes, you can pick up the VIP and move it to a different
system in the same VLAN.

...OR, if that service VIP has a CNAME pointing to it, you can simply
cut over the CNAME destination to a service VIP in a different VLAN
without breaking all your clients.

Thus, "System-Service Abstraction"

This becomes especially paramount in High Availability configurations
where at service VIP dangles between two or more servers.

It is also extremely important when you're trying to manage firewall
rule growth.   At present, if you have multiple VIPs/IP Aliases on
Bacula, you can control which one "Listening Sockets" bind to, but say
for example, when writing rules that would permit the Director to send
control messages to File Daemons, or Storage Daemons to send messages to
Directors, or Consoles to Directors, you want your rules to reflect the
source address of the service VIP for "new client sockets".


~BAS


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