Re: [v6ops] PI [ULA draft revision #2 Regarding isolated networks]

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> > It's certainly possible, but you will never see an IPv4 host do it
> > automatically.  It has to be configured manually, and rarely makes much
> > sense other than for servers that simply need an additional public
> > identifier, or routers that need to do network address translation and
> > hence need an IP address on both the public and private subnets.
> 
> ...or any of the situations where it might make sense in the same way that
> it might make sense for ipv6, which is why all major operating systems have
> GUI access to make it easy to add secondary ipv4 addresses on any
> interface.  Secondary ipv4 addresses are completely mainstream, even if we
> all used them before they were cool.

Absolutely agreed. We tend to put each service on its own IP address -
makes it much easier to move the service later without affecting other
services on the same server.

Steinar Haug, AS 2116