No ACK 
Allows you to enable or disable NO ACK. This feature is 
recommended for data services where transmission is 
important and packet loss is tolerable to a certain degree. If 
you select Disable, an acknowledge packet is returned for 
every packet received. This provides a more reliable 
transmission, but it increases traffic load, which decreases 
performance. 
Select the desired option: 
  Enable 
  Disable (factory default)