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[SLUG] getting ip of an ADSL box...

Hi, I want to get the ip address of a box that is connected to the net via
ADSL (I want to be able to ssh on to it). What I think would be simple is
to get it to email me whenever the ip changes (ifconfig |mail foo@bar)
just wondering the best place to put this - does ADSL use auth-up? Does
the ip only change if you lose the connection? Not sure how it uses pppd -
I could set up a cron job but.... yuk!

regards, Mehmet