User Guide
http://www.peplink.com 
54 
Copyright @ 2017 Peplink 
When a static speed is set, you may choose whether to advertise its speed to the peer 
device or not. Advertise Speed is selected by default. You can choose not to advertise the 
port speed if the port has difficulty in negotiating with the peer device. 
Default: Auto 
MTU 
This field is for specifying the Maximum Transmission Unit value of the WAN connection. An 
excessive MTU value can cause file downloads stall shortly after connected. You may 
consult your ISP for the connection's MTU value. 
MSS 
This field is for specifying the Maximum Segment Size of the WAN connection. 
When Auto is selected, MSS will be depended on the MTU value. When Custom is selected, 
you may enter a value for MSS. This value will be announced to remote TCP servers for 
maximum data that it can receive during the establishment of TCP connections. 
Some Internet servers are unable to listen to MTU setting if ICMP is filtered by firewall 
between the connections. 
Normally, MSS equals to MTU minus 40. You are recommended to reduce the MSS only if 
changing of the MTU value cannot effectively inform some remote servers to size down data 
size. 
Default: Auto 
MAC Address 
Clone 
Some service providers (e.g. cable network) identify the client's MAC address and require 
client to always use the same MAC address to connect to the network. If it is the case, you 
may change the WAN interface's MAC address to the client PC's one by entering the PC's 
MAC address to this field. If you are not sure, click the Default button to restore to the default 
value. 
VLAN 
Check the box to assign a VLAN to the interface. 
DHCP Settings 
Hostname 
(Optional) 
If your service provider's DHCP server requires you to supply a hostname value upon 
acquiring an IP address, you may enter the value here. If your service provider does not 
provide you with a hostname, you can safely bypass this option. 
DNS Servers 
Each ISP may provide a set of DNS servers for DNS lookups. This setting specifies the 
DNS (Domain Name System) servers to be used when a DNS lookup is routed through 










