ZyXEL Communications USG40 User Manual page 207

Table 85 Configuration > Network > Interface > VLAN > Create Virtual Interface (continued)
LABEL DESCRIPTION
MTU Maximum Transmission Unit. Type the maximum size of each data packet, in bytes,
that can move through this interface. If a larger packet arrives, the ZyWALL/USG
divides it into smaller fragments. Allowed values are 576 - 1500. Usually, this value is
1500.
Connectivity Check The ZyWALL/USG can regularly check the connection to the gateway you specified to
make sure it is still available. You specify how often to check the connection, how long
to wait for a response before the attempt is a failure, and how many consecutive
failures are required before the ZyWALL/USG stops routing to the gateway. The
ZyWALL/USG resumes routing to the gateway the first time the gateway passes the
connectivity check.
Enable Select this to turn on the connection check.
Connectivity
Check
Check Method Select the method that the gateway allows.
Select icmp to have the ZyWALL/USG regularly ping the gateway you specify to make
sure it is still available.
Select tcp to have the ZyWALL/USG regularly perform a TCP handshake with the
gateway you specify to make sure it is still available.
Check Period Enter the number of seconds between connection check attempts.
Check Timeout Enter the number of seconds to wait for a response before the attempt is a failure.
Check Fail Enter the number of consecutive failures before the ZyWALL/USG stops routing through
Tolerance
the gateway.
Check Default Select this to use the default gateway for the connectivity check.
Gateway
Check this Select this to specify a domain name or IP address for the connectivity check. Enter
address
that domain name or IP address in the field next to it.
Check Port This field only displays when you set the Check Method to tcp. Specify the port
number to use for a TCP connectivity check.
DHCP Setting The DHCP settings are available for the OPT, LAN and DMZ interfaces.
DHCP Select what type of DHCP service the ZyWALL/USG provides to the network. Choices
are:
None - the ZyWALL/USG does not provide any DHCP services. There is already a DHCP
server on the network.
DHCP Relay - the ZyWALL/USG routes DHCP requests to one or more DHCP servers
you specify. The DHCP server(s) may be on another network.
DHCP Server - the ZyWALL/USG assigns IP addresses and provides subnet mask,
gateway, and DNS server information to the network. The ZyWALL/USG is the DHCP
server for the network.
These fields appear if the ZyWALL/USG is a DHCP Relay.
Relay Server 1 Enter the IP address of a DHCP server for the network.
Relay Server 2 This field is optional. Enter the IP address of another DHCP server for the network.
These fields appear if the ZyWALL/USG is a DHCP Server.
IP Pool Start Enter the IP address from which the ZyWALL/USG begins allocating IP addresses. If
Address
you want to assign a static IP address to a specific computer, click Add Static DHCP.
If this field is blank, the Pool Size must also be blank. In this case, the ZyWALL/USG
can assign every IP address allowed by the interface's IP address and subnet mask,
except for the first address (network address), last address (broadcast address) and
the interface's IP address.
Chapter 8 Interfaces
ZyWALL/USG Series User's Guide
207