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G2wifi II User’s Manual
Copyright of 3JTech Co., Ltd. (also doing business as A3J Engineering Inc.)
23
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.
WAN Port Speed:
Normally, this is set to "auto". If you have trouble connecting to the
WAN, try the other settings.
Respond to WAN Ping:
If you leave this option unchecked, you are causing the public
WAN IP address of the router not to respond to
ping
commands. Pinging public WAN IP
addresses is a common method used by hackers to test whether your WAN IP address is
valid.
WAN Ping Inbound Filter:
Select a filter that controls access as needed for WAN pings.
If you do not see the filter you need in the list of filters, go to the
Advanced -> Inbound
Filter
screen and create a new filter.
MAC Cloning Enabled:
Some ISP's may check your computer's MAC address. Each
networking
device
has its own unique MAC address defined by the hardware
manufacturer. Some ISP's record the MAC address of the network adapter in the
computer or router used to initially connect to their service. The ISP will then only grant
Internet access to requests from a computer or router with this particular MAC address.
Your new 3Jtech router has a different MAC address than the computer or router that
initially connected to the ISP. To resolve this problem, the 3Jtech router has a special
feature that allows you to clone (that is, replace the router's MAC address with) another
MAC address.
MAC Address:
If you have enabled MAC Cloning, you can either type in
an alternate MAC address (for example, the MAC address of the router initially
connected to the ISP) or copy the MAC address of a PC. To copy the MAC address of the
computer that initially connected to the ISP, connect to the 3Jtech router using that
computer and click the
Clone Your
PC’s MAC Address
button. The WAN port will then
use the MAC address of the network adapter in your computer.
