iptables и искусственная потеря пакетов

   statistic
       This module matches packets based on some statistic condition.  It sup‐
       ports two distinct modes settable with the --mode option.

       Supported options:

       --mode mode
              Set  the matching mode of the matching rule, supported modes are
              random and nth.

       --probability p
              Set the probability from 0 to 1 for  a  packet  to  be  randomly
              matched. It works only with the random mode.