ZyXEL Communications ZyWall USG20-VPN User Manual page 160

Table 64 Configuration > Network > Interface > Ethernet > Edit (continued)
LABEL DESCRIPTION
Advertised Hosts Select this to have the USG indicate to hosts to obtain network settings (such as prefix
Get Network
and DNS settings) through DHCPv6.
Configuration
From DHCPv6
Clear this to have the USG indicate to hosts that DHCPv6 is not available and they
should use the prefix in the router advertisement message.
Advertised Hosts Select this to have the USG indicate to hosts to obtain DNS information through
Get Other
DHCPv6.
Configuration
From DHCPv6
Clear this to have the USG indicate to hosts that DNS information is not available in
this network.
Router Select the router preference (Low, Medium or High) for the interface. The interface
Preference
sends this preference in the router advertisements to tell hosts what preference they
should use for the USG. This helps hosts to choose their default router especially when
there are multiple IPv6 router in the network.
Note: Make sure the hosts also support router preference to make this function work.
MTU The Maximum Transmission Unit. Type the maximum size of each IPv6 data packet, in
bytes, that can move through this interface. If a larger packet arrives, the USG
discards the packet and sends an error message to the sender to inform this.
Hop Limit Enter the maximum number of network segments that a packet can cross before
reaching the destination. When forwarding an IPv6 packet, IPv6 routers are required to
decrease the Hop Limit by 1 and to discard the IPv6 packet when the Hop Limit is 0.
Advertised Configure this table only if you want the USG to advertise a fixed prefix to the network.
Prefix Table
Add Click this to create an IPv6 prefix address.
Edit Select an entry in this table and click this to modify it.
Remove Select an entry in this table and click this to delete it.
# This field is a sequential value, and it is not associated with any entry.
IPv6 Enter the IPv6 network prefix address and the prefix length.
Address/
Prefix Length
The prefix length indicates what the left-most part of the IP address is the same for all
computers in the network, that is, the network address.
Advertised This table is available when the Interface Type is internal. Use this table to
Prefix from
configure the network prefix if you want to use a delegated prefix as the beginning part
DHCPv6 Prefix
of the network prefix.
Delegation
Add Click this to create an entry in this table.
Edit Select an entry in this table and click this to modify it.
Remove Select an entry in this table and click this to delete it.
# This field is a sequential value, and it is not associated with any entry.
Delegated Select the DHCPv6 request object to use for generating the network prefix for the
Prefix
network.
Suffix Enter the ending part of the IPv6 network address plus a slash (/) and the prefix
Address
length. The USG will append it to the selected delegated prefix. The combined address
is the network prefix for the network.
For example, you got a delegated prefix of 2003:1234:5678/48. You want to divide it
into 2003:1234:5678:1111/64 for this interface and 2003:1234:5678:2222/64 for
another interface. You can use ::1111/64 and ::2222/64 for the suffix address
respectively. But if you do not want to divide the delegated prefix into subnetworks,
enter ::0/48 here, which keeps the same prefix length (/48) as the delegated prefix.
Chapter 9 Interfaces
USG20(W)-VPN Series User's Guide
160