anchor.diff:            ''
               #for i in $(cd /sys/class/net && ls -d *); do
               #    echo "Taking down network device $i..."
  -            #    ${nettools}/sbin/ifconfig $i down || true
  +            #    ${ifconfig} $i down || true
               #done
             '';
         };
  
positive.code: 
              for i in $(cd /sys/class/net && ls -d *); do
                  echo "Bringing up network device $i..."
                  ${nettools}/sbin/ifconfig $i up || true
              done
  
              # Configure the manually specified interfaces.
  
negative.code:   inherit (pkgs) nettools;
  
    cfg = config.networking;
  
    ifconfig = "${nettools}/sbin/ifconfig";
  
  in 
  
  