telnetting from a cron script?

My adsl-modem looses its NAPT address, making my machine inaccessable from the outside, and I planned having my holidays.. I can detect the address-loss in a cron job, and I can restore it with a telnet session: $ telnet 10.0.0.138 Connected to 10.0.0.138. Escape character is '^]'. Username : wybo Password : ****** [...] =>nat create protocol=tcp outside_addr=84.84.54.213 outside_port=80 \ inside_addr=10.0.0.150 inside_port=80 =>exit But, being absent when this happens - is there a way to do this from the cron job? -- Wybo