What do I need to tunnel ICMP packets on a windows client?

"From the instructions on the ptunnel website:

The -p switch sets the address of the
host on which the proxy is running. A
quick test to see if the proxy will
work is simply to try pinging this
host - if you get replies, you should
be able to make the tunnel work.

The -lp, -da and -dp switches set the
local listening port, destination
address and destination port. For
instance, to tunnel ssh connections
from the client machine via a proxy
running on proxy.pingtunnel.com to the
computer login.domain.com, the
following command line would be used:

sudo ./ptunnel -p proxy.pingtunnel.com -lp 8000 -da login.domain.com -dp 22

You will need to replace proxy.pingtunnel.com with your server that is running the proxy, login.domain.com is the website you would like to visit, and 22 should be 80. Then you should be able to enter http://localhost:8000 into your browser.

One down side of this is that you can only connect to one domain with each instance of ptunnel that is running, but still cool when you're in a pinch."