3 The Experiment

Open a window to an IPsec host and another window to an insecure host.

Now start capturing packets.

In the “secure” window, run the UNIX® command yes(1), which will stream the y character. After a while, stop this. Switch to the insecure window, and repeat. After a while, stop.

Now run MUST on the captured packets. You should see something like the following. The important thing to note is that the secure connection has 93% (6.7) of the expected value (7.18), and the “normal” connection has 29% (2.1) of the expected value.

% tcpdump -c 4000 -s 10000 -w ipsecdemo.bin
% uliscan ipsecdemo.bin

Uliscan 21 Dec 98
L=8 256 258560
Measuring file ipsecdemo.bin
Init done
Expected value for L=8 is 7.1836656
6.9396 --------------------------------------------------------
6.6177 -----------------------------------------------------
6.4100 ---------------------------------------------------
2.1101 -----------------
2.0838 -----------------
2.0983 -----------------