naman@naman-laptop:~$ traceroute google.co.in
google.co.in: Name or service not known
Cannot handle "host" cmdline arg `google.co.in' on position 1 (argc 1)

Then I tracked the IP address of google.com on http://www.ip-adress.com/ip_trace and tried

naman@naman-laptop:~$ traceroute 74.125.77.99
traceroute to 74.125.77.99 (74.125.77.99), 30 hops max, 40 byte packets
connect: Network is unreachable

I have to use my college proxy server to connect to the Internet. When I traceroute to a host within the LAN there is no problem.

What should I do to be able to traceroute to a host outside my local network?

Are you able to connect to the outside world at all on this laptop? It is possible that your router is disallowing ICMP echo requests to the outside world; in which case either allow it or ask your admin to do so.

since you're using a proxy ,you can't use traceroute ,because the ICMP request is disabled on the proxy.this is how it works