anchor.diff:  
               for i in $(cd /sys/class/net && ls -d *); do
                   echo "Bringing up network device $i..."
  -                ${nettools}/sbin/ifconfig $i up || true
  +                ${ifconfig} $i up || true
               done
   
               # Configure the manually specified interfaces.
  
positive.code:           ''
              #for i in $(cd /sys/class/net && ls -d *); do
              #    echo "Taking down network device $i..."
              #    ${nettools}/sbin/ifconfig $i down || true
              #done
            '';
        };
  
negative.code:                   if test -n "${i.subnetMask}"; then
                        extraFlags="$extraFlags netmask ${i.subnetMask}"
                    fi
                    ${ifconfig} "${i.name}" "${i.ipAddress}" $extraFlags || true
                  ''
                else "") cfg.interfaces}
  
  