Can I use http tunnel to ping or traceroute through a proxy with firewall?

No. Ping and traceroute make use of lower layer network protocols (ICMP and/or UDP, in particular, which are layer 4 protocols) and will not work over an HTTP (layer 7) tunnel. In any case, even if you could convince the HTTP proxy to open a raw TCP session for you (which is how some HTTP tunneling works) you would not receive the necessary packets to confirm that the host is reachable.(ICMP echo reply, in the case of ping, or the time-to-live expired ICMP packets in the case of traceroute) To test for connectivity in this situation, I think the best you can do is an HTTP "ping".(Try to establish an HTTP connection with the remote host and see if it works.) For example, you could do something like: $ http_proxy=http://webproxy.example.com:3128 \ > curl -I http://google.com/ > /dev/null 2>&1 \ > && echo success || echo failure Assuming you have curl installed, this would print "success" if google.

Com is reachable through your proxy and "failure" if not.

Thank you. I tried it, but still it is showing failure... please tell me where I might be wrong – pflz Feb 5 at 4:38 Try a command of the format http_proxy=: curl -I google.com/, which might be more instructive. (In other words, first make sure you have the proxy address correct and the proxy is reachable.

You can try telnet and see if it connects, or if the connection is refused. ) – Mike Feb 5 at 4:45 Also, try echo $http_proxy to see if it's already been set for you. If so, you can leave it out and just use curl.

– Mike Feb 5 at 5:18.

It's not exactly what you were looking for, but if you can access and external ssh server, you can run it through that, and the results will reflect the ping time to the ssh server: $ ssh username@server 'ping -c 1 google. Com' PING google. Com (72.14.204.147) 56(84) bytes of data.64 bytes from iad04s01-in-f147.1e100.Net (72.14.204.147): icmp_seq=1 ttl=57 time=2.64 ms --- google.

Com ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 2.640/2.640/2.640/0.000 ms.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.