User Guide
Table Of Contents
- 1 At a glance
- 2 Quick setup
- 3 Login
- 4 System status
- 5 Internet settings
- 6 Wireless
- 7 Address reservation
- 8 Bandwidth control
- 9 Authentication
- 9.1 Overview
- 9.2 Configure captive portal
- 9.3 Example of captive portal
- 9.4 User management
- 10 AP mangement
- 11 Filter management
- 12 More settings
- 12.1 LAN settings
- 12.2 WAN parameters
- 12.3 Configure static route
- 12.4 Port mirroring
- 12.5 Manage your router remotely using web UI
- 12.6 DDNS
- 12.7 Port forwarding
- 12.8 DMZ host
- 12.9 UPnP
- 12.10 Any IP
- 12.11 Security settings
- 12.12 VPN server
- 12.13 VPN client
- 12.14 IPSec
- 12.15 Example of configuring VPN conenctions
- 12.16 Multi-WAN policy
- 13 Maintenance
- Appendix
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12.2.3 MTU
MTU is abbreviated for Maximum Transmission Unit. It specifies the maximum size of a packet that
can be transmitted by a network device. Either larger or smaller MTU value affects the network
performance. Do not modify the default settings unless the following situations happen:
Some websites are inaccessible, or secure websites cannot be displayed properly, such as online
banking websites, or PayPal.
Email service suspends, or servers, such as FTP/POP servers, are inaccessible.
Commonly-used MTU value in different scenarios:
MTU (Bytes)
Scenario
1500
It is the most common value for non-PPPoE connections and non-VPN connections.
1492
It is used for PPPoE connections.
1480
It is the maximum value for the pinging function. (If a greater value is used, packets are
split.)
1450
It is used for DHCP, which assigns dynamic IP addresses to connected devices.
1400
It is used for VPNs or PPTP.
12.2.4 Clone MAC address
Overview
Some ISPs allow only a single or a certain number of computers to use the broadband service you
subscribed, and register the MAC address of your computer when you first use their cable modem
for internet access. Therefore, you may find yourself in the following situations after setting up the
router:
Only one computer can access the internet normally.
No internet connection at all.
The reason why such a problem happens is that your ISP does not accept MAC addresses other than
the registered one. To resolve this, you need to clone the MAC address of the registered computer
to the router to pretend that the router has the same MAC address as the registered one.
The cloning MAC address function is designed for this purpose. Click More > WAN Parameters to
enter the configuration page.