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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel,gmane.emacs.pretest.bugs
Subject: Re: recentf-cleanup, file-readable-p & remote files
Date: Thu, 18 Sep 2003 11:14:48 -0400
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    Not connected to the Internet, off-line (if you're using a telephone
    modem with a per-minute charge, you're usually off-line).

How do you tell whether the machine is connected?

Perhaps you could call the new function network-interface-list and see
if the list contains anything except the loopback device.  That is not
entirely correct, since you might be connected to a local ethernet
which does not have an external connection, or is behind a firewall.
But is it good enough?