EnGenius Technologies ESR9855G - Manual (Page 29)

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4.2.2. DNS Settings
Most of the ISP does not require user to specify DNS settings. In case where DNS needed to be specified you can
change the setting in this section.
4.2.3. MTU Settings
Most of the ISP does not require user to specify MTU settings. In case where MTU needed to be specified. You can
change the setting in this section.
MTU: The Maximum Transmission Unit (MTU) is a parameter that determines the largest packet size (in bytes) that the router will
send to the WAN. If LAN devices send larger packets, the router will break them into smaller packets. Ideally, you should set this to
match the MTU of the connection to your ISP. Typical values are 1500 bytes for an Ethernet connection and 1492 bytes for a PPPoE
connection. If the router's MTU is set too high, packets will be fragmented downstream. If the router's MTU is set too low, the router
will fragment packets unnecessarily and in extreme cases may be unable to establish some connections. In either case, network
performance can suffer.