EnGenius Technologies ENH500 - Manual (Page 55)

Secondary DNS servers manually.
Discard Ping on WAN Place a check to Enable or Disable ping from WAN.
Accept / Cancel Press Accept to confirm the changes or Cancel to return
previous settings.
Accept does not apply the changes – you must go to Status -> Save / Load
to apply the new settings. Please refer to Chapter 4.1 for more information.
If the router's MTU is set too high, downstream packets will be fragmented. If
the router's MTU is set too low, the router will fragment packets unnecessarily and, in extreme
cases, may be unable to establish connections. In either case, network performance can suffer.