On 12/6/05, Frederick Cheung wrote:
>>> To each interface there can be assigned multiple IP addresses.
>>
>> Multiple ones? WOW!!! yet MORE confusion... Gackkkk!
In practice this is rare and typically used as follows:
(1) To host multiple websites (or services) on a single box where each
site responds to a different IP address. Newer versions of HTTP can
distinguish websites by the domain name in the URL so don't need this.
(2) For "Static NAT" where one or more public IP addresses are mapped to
private IP addresses behind a NAT firewall similar to a DMZ. In this
case it's not actually necessary to create public IP interfaces as long
as ARP is configured to publish the corresponding IP addresses.
(3) To support single Ethernet or one arm gateways that forward packets
in and out the same port.
Some BSD networking tools refer to these additional IP addresses as
"aliases". In any case, it's probably safe to assume the user has
arranged to place the "Primary Interface" first in the currently
selected location (service order) within the System Configuration
Framework (SCF).
Using the SCF looks harder than it really is. It's just a collection of
Dictionaries and Arrays specifying various interface attributes. Once
you grasp the schema (organization of keys and attributes), it's fairly
straight forward to extract any information you need.
Kind Regards,
- Peter
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