John Andersen wrote:
I read his problem as being the fact that an unused ADSL connection will drop, and without some activity from the Inside, it will stay down.
He either needs to keep it up, or restart it periodically.
I had the same problem with a remote computer, and found that one ping every 3 minutes would keep it alive.
man ping
Set interval for 180 seconds, or run ping c1 from a cron job. I also found that setting -Q 4 necessary as ISPs are on to the ping trick and in many cases do not consider pings as an in-use connection and will drop you anyway.
One thing Linux users can do, is run this command: lynx --dump "http://checkip.dyndns.org/" Not only does this genereate real web traffic, it also produces the current IP address, which can, if desired, be e-mailed somewhere.