Hii, Thamks for the answer. I get this error from that code : 
Unable to create UDP socket: A socket operation was attempted to an un
+reachable
network....

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And don't this static IP return handle this error ? I mean doing this : 
return $address='192.80.160.16';

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should return return '192.80.160.16' instead of this error message. so how to get rid of this error and return '192.80.160.16' when there is no IP recived (when disconnected) otherwise return the real IP which it receives.

In reply to Re^2: How to handle Net::Address::IP::Local'->public when we are not connected to internet by Anonymous Monk
in thread How to handle Net::Address::IP::Local'->public when we are not connected to internet by ppp

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