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Page 76 / 211 Scroll up to view Page 71 - 75
72
IPv6 Autoconfig
The IPv6 address composes of two parts, the prefix and the interface ID.
There are two ways to dynamically configure IPv6 address on hosts. One is “stateful” configuration,
for example using DHCPv6 (which resembles its counterpart DHCP in IPv4.) In the stateful auto-
configuration model, hosts obtain interface addresses and/or configuration information and
parameters from a DHCPv6 server. The Server maintains a database that keeps track of which
addresses have been assigned to which hosts.
The second way is “stateless” configuration. Stateless auto-configuration requires no manual
configuration of hosts, minimal (if any) configuration of routers, and no additional servers. The
stateless mechanism allows a host to generate its own addresses using a combination of locally
available information (MAC address) and information (prefix) advertised by routers. Routers
advertise prefixes that identify the subnet(s) associated with a link, while hosts generate an
"interface identifier" that uniquely identifies an interface on a subnet. An address is formed by
combining the two. When using stateless configuration, you needn’t configure anything on the client.
Group Name:
Here group refers to the group you set in
Interface Grouping
section, you can set
the parameters for the specific group. Select the group by the drop-down box. For more
information please refer to
Interface Grouping
of this manual.
Static LAN IPv6 Address Configuration
Interface Address / Prefix Length:
Enter the static LAN IPv6 address.
IPv6 LAN application
DHCPv6 Server:
Check whether to enable DHCPv6 server.
DHCPv6 Server Type:
Select Stateless or Stateful. When DHCPv6 is enabled, this parameter is
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73
available.
Stateless:
If selected, the PCs in LAN are configured through RA mode, thus,
the PCs in
LAN are configured through RA mode, to obtain the prefix message and generate an address using
a combination of locally available information (MAC address) and information (prefix) advertised by
routers, but they can obtain such information like DNS from DHCPv6 Server.
Stateful:
if selected,
the PCs in LAN will be configured like in IPv4 mode, thus obtain addresses and DNS information
from DHCPv6 server.
Start interface ID:
Enter the start interface ID. The IPv6 address composed of two parts, thus, the
prefix and the interface ID. Interface is like the Host ID compared to IPv4.
End interface ID:
Enter the end interface ID.
Note:
Interface ID does NOT support ZERO COMPRESSION "::". Please enter the complete
information.
For example: Please enter "0:0:0:2" instead of "::2".
Leased Time (hour):
The leased time, similar to leased time in DHCPv4, is a time limit assigned to
clients, when expires, the assigned ID will be recycled and reassigned.
Issue Router Advertisement:
Check whether to enable issue Router Advertisement feature. It is to
send Router Advertisement messages periodically.
ULA Prefix Advertisement:
Enable this parameter to include the ipv6 ULA address in the RA
messages. ULA, unique local address, is an IPv6 address in the block fc00::/7. It is approximately
the IPv6 counterpart of the IPv4 private address. They are not routable in the global IPv6 Internet.
RADVD Type:
The way that ULA prefix is generated.
Randomly Generated
Statically Configured: select to set manually in the following parameters.
Prefix:
Set the prefix manually.
Preferred Life Time:
The ULA prefix life time. When the time is over, the ULA prefix is invalid any
more, -1 means no limit.
Valid Life Time:
It is a time threshold, when the time is over, clients should obtain new IPv6 address
from the router through RA; -1 means to be limitless.
MLD snooping:
Similar to IGMP snooping, listens in on the MLD conversation between hosts and
routers by processing MLD packets sent in a multicast network, and it analyzes all MLD packets
between hosts and the connected multicast routers in the network. Without MLD snooping, multicast
traffic is treated in the same manner as broadcast traffic - that is, it is forwarded to all ports. With
MLD snooping, multicast traffic of a group is only forwarded to ports that have members of that
group.
Standard Mode:
In standard mode, multicast traffic will flood to all bridge ports when no
client subscribes to a multicast group.
Blocking Mode:
In blocking mode, the multicast data will be blocked when there is no
client subscribes to a multicast group, it won’t flood to the bridge ports.
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74
Stateless and Stateful IPv6 address Configuration
Stateless:
Two methods can be carried.
With DHCPv6 disabled, but Issue Router Advertisement Enabled
With this method,
the PCs in LAN are configured through RA mode, thus,
the PCs in LAN are
configured through RA mode, to obtain the prefix message and generate an address using a
combination of locally available information (MAC address) and information (prefix) advertised by
routers.
With both DHCPv6 and Issue Router Advertisement Enabled
With this method, the PCs’ addresses in LAN are configured like above method, but they can
obtain such information like DNS from DHCPv6 Server.
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75
Stateful:
two methods can be adopted.
With only DHCPv6 enabled
With this method, the PCs’ addresses are configured the same as in IPv4, that is addresses are
assigned by DHCPv6 server.
With both DHCPv6 and Issue Router Advertisement Enabled
With this method, the PCs’ addresses are configured the same like above, and the address
information in RA packets will be neglected.
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76
Interface Grouping
Interface grouping is a function to group interfaces, known as VLAN. A Virtual LAN, commonly known
as a VLAN, is a group of hosts with the common set of requirements that communicate as if they were
attached to the same broadcast domain, regardless of the physical location. A VLAN has the same
attributes as a physical LAN, but it allows for end stations to be grouped together even if they are not
located on the same network switch.
Each group will perform as an independent network. To support this feature, you must create
mapping groups with appropriate LAN and WAN interfaces using the Add button.
(Please
Note:
P4 can be configured as EWAN, and when the device is in EWAN profile, there is no
P4/EWAN interface as P4 is working as a WAN port.)

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