Ping IP doesn't work

[khalil]

Instead of executing ping/telnet you can try connecting to a known open TCP port on a device if it has one.

Code:

function pingtcp(ip, port)
  local sock = require('socket').tcp()
  sock:settimeout(1)
  local res, err = sock:connect(ip, port)
  sock:close()
  return res, err
end

res, err = pingtcp('192.168.1.1', 80)
log(res, err)

thank you 
does this work with ftp port 21?