ur using pppoe-dialer in-built on the router/modem.if u switch off & restart modem while on linux,the networking still insists on given IP by router for local lan,while airtel may be giving u dynamic IP's for each connxn.I dont have experiance with vector linux.some distros dont have zeroconf or avahi for network-detection.try to enable dhcp in ur distro.it sure have some tools to enable dhcp.also,restarting the network will fetch the internet.
u need to use terminal and enter root passwd(su -) to get root access.restart network by
Code:
/etc/init.d/network restart
now if connected,post the output of the command
normally i prefer bridge mode,where u dial manually from Linux or windows to get connected.
edit:BTW,change ur router/modem's admin password to something else.there seems to be some security problem with default password.
see the thread:
http://www.vectorlinux.com/forum2/in...p?topic=2096.0