IP Addressing Problems: on my laptop

[Ben Laurie]

Mark S. Miller wrote:
> >It was never the case that an IP address mapped to a host.  It was rather
> >the case that an IP address mapped to a host *interface*.
> 
> [#] Java's networking API has no notion of host interface vs host.
> As far as I can tell.

Hang on - no networking API has a notion of hosts _or_ interfaces. They
have a notion of IP numbers, surely? An IP number maps to an interface
(maybe - for example, transparent proxies will map different ports on
the same IP to different IPs behind the proxy!) and an interface maps to
a host.

It seems to me that if A is currently talking to B and wants to be able
to talk to B again in the future, then it is up to B to tell A how to do
that (e.g. "use domain name X" or "connect to port Y on IP Z" or "make a
query with contents V to domain name W" [this last being a bit scary,
but might include, for example, LDAP queries]). A cannot guess by
looking at B's hostname, IP address or DNS.

BTW, apologies for not using this [#,?,...] stuff - where is it defined?

Cheers,

Ben.

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