ya ,
as startup :-
wget 'http://reliancebroadband.co.in/reliance/startportal_isg.do?userId=USERNAME&password=PASSWORD&action=doLoginSubmit' -O /dev/nullreplace USERNAME with your username/subscriber ID and PASSWORD as your password.
then in keep alive section, under connection watchdog i am using to ping to following at an interval of 1000 seconds,
74.125.236.129 74.125.236.130 124.124.5.135 this is google.com and our
dns ips. using space at max 3 ips can be added here.
i am not a Computer enginner so i don't know much about cron jobs, they are the best solution to this autologin feature, but the above works just fine for me .
as the watchdog is set at 16 minutes , at max if i am disconnected after 24 hours i get logged in automatically in 16minutes, so not a big dear .... & you can adjust the seconds as per your wish.
hope this was helpful !!!
edit :- THERE SCRIPTS ARE FOR DD-WRT FIRMWARE AND NOT FOR CMD OR ANYTHING ELSE.