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:   inherit (pkgs) nettools;
  
    cfg = config.networking;
  
  in 
  
  
negative.code:           ''
              #for i in $(cd /sys/class/net && ls -d *); do
              #    echo "Taking down network device $i..."
              #    ${ifconfig} $i down || true
              #done
            '';
        };
  