ZyXEL Communications VSG-1200 User Manual
VSG-1200 User’s Guide
Chapter 4 LAN, WAN and Server Setup
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4.7.2 MTU
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 any
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.
(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 any
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.
4.7.3 WAN IP Address Settings
Use the WAN/LAN screen to change the WAN IP address settings.
Figure 20 System Setting: WAN/LAN: WAN IP
The following table describes the related labels in this screen.
Table 7 System Setting: WAN/LAN: WAN IP
FIELD
DESCRIPTION
WAN Port Mode
Get automatically from a
DHCP server
Select this option to set the VSG to act as a DHCP client on the WAN. The
VSG obtains TCP/IP information (IP address, DNS server information, etc.)
from a DHCP server.
MTU Setting
Enter the MTU (Maximum Transfer Unit) size.