Chapter 10 Interfaces
ZyWALL USG Series User’s Guide
378
Router
Preference
Select the router preference (Low, Medium or High) for the interface. The interface sends
this preference in the router advertisements to tell hosts what preference they should use
for the Zyxel Device. 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 Zyxel Device divides it
into smaller fragments.
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 Prefix
Table
Configure this table only if you want the Zyxel Device to advertise a fixed prefix to the
network.
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
Address/
Prefix Length
Enter the IPv6 network prefix address and the 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 Prefix
from DHCPv6
Prefix Delegation
Use this table to configure the network prefix if you want to use a delegated prefix as the
beginning part of the network prefix.
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.
References Select an entry and click References to open a screen that shows which settings use the
entry.
# This field is a sequential value, and it is not associated with any entry.
Delegated
Prefix
Select the DHCPv6 request object to use for generating the network prefix for the network.
Suffix
Address
Enter the ending part of the IPv6 network address plus a slash (/) and the prefix length. The
Zyxel Device 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.
Address This is the final network prefix combined by the selected delegated prefix and the suffix.
Note: This field displays the combined address after you click OK and reopen this
screen.
Interface Parameters
Egress Bandwidth Enter the maximum amount of traffic, in kilobits per second, the Zyxel Device can send
through the interface to the network. Allowed values are 0 - 1048576.
Table 125 Configuration > Network > Interface > Bridge > Add / Edit (continued)
LABEL DESCRIPTION
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