ZyXEL Communications ZyXEL ZyAIR B-4000 Quick Installation Manual page 9

Figure 6 Internet Connection: Static_IP
Figure 7 Internet Connection: PPPoE
For optimum communications, the number of bytes in the data segment and the header must add up to less than
the number of bytes in the maximum transmission unit (MTU).
Enter the name of your PPPoE server, in the Service Name field if provided; otherwise leave it blank.
Select Connect on Demand when you don't want an "always-on" connection and specify an inactivity time limit
(in minutes) in the Max Idle Time field.
Select Keep Alive if you want an "always-on" connection. The Redial Period is how long the ZyAIR waits before
reconnecting in the event of a disconnect. Click Next to continue to Figure 9.
ZyAIR B-4000
Select Static_IP If the ISP assigned a fixed IP
address.
Enter the WAN IP address, subnet mask,
gateway IP address and DNS server address(s)
that your ISP assigned you.
Click Next to continue to Figure 9.
Select PPPoE If the ISP uses PPPoE for your
account (PPPoE simulates a dial-up connection).
Enter the user name and password exactly as
your ISP assigned them.
A maximum transmission unit (MTU) is the
largest size packet or frame, specified in octets
(eight-bit bytes) that can be sent in a packet- or
frame-based network. The Transmission Control
Protocol (TCP) uses the MTU to determine the
maximum size of each packet in a transmission.
Too large an MTU size may mean
retransmissions if the packet encounters a router
that can't handle that large a packet. Too small
an MTU size means relatively more header
overhead and more acknowledgements that
have to be sent and handled.
The maximum segment size (MSS) is the largest
amount of data, specified in bytes, that a
computer or communications device can handle
in a single, unfragmented piece.
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