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dhcp with network restart problem


i have a dodgy cable modem which frequently cuts out requiring it to
re-negotiate the link. my firewall/irc box often fails to come back after some cut

sometimes the interface remains up with the correct IP address but for some
reason it can't find anything on the 'net. the dhcp lease has been the same
for 2 months now so it's not the IP address given to the modem changing.

other times, after longer periods of outage the interface is dropped - is
there a timeout?

if either of the two happen above then i would like to do an
/etc/init.d/networking restart - this doesn't work tho. the dhcp request never gets any
where. so i have to reboot just to get the interface back up.

any suggestions?

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