IP Configuration
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Instruction Manual - NXA-ENET8-POE+
Configuring IPv6 Interface Settings
Use the System > IPv6 Configuration (Configure Interface) page to configure general IPv6 settings for the selected VLAN,
including auto-configuration of a global unicast interface address, explicit configuration of a link local interface address, the MTU
size, and neighbor discovery protocol settings for duplicate address detection and the neighbor solicitation interval.
Command Usage
The switch must be configured with a link-local address. The switch's address auto-configuration function will
automatically create a link-local address, as well as an IPv6 global address if router advertisements are detected on the
local interface.
The option to explicitly enable IPv6 creates a link-local address, but will not generate a global IPv6 address if
auto-configuration is not enabled. In this case, you can manually configure a global unicast address (see the
IPv6 Neighbor Discovery Protocol supersedes IPv4 Address Resolution Protocol in IPv6 networks. IPv6 nodes on the same
network segment use Neighbor Discovery to discover each other's presence, to determine each other's link- layer
addresses, to find routers and to maintain reachability information about the paths to active neighbors. The key
parameters used to facilitate this process are the number of attempts made to verify whether or not a duplicate address
exists on the same network segment, and the interval between neighbor solicitations used to verify reachability
information.
The following table lists the options on this page:
System - IPv6 Configuration Options
VLAN
ID of a configured VLAN that is to be used for management access. By default, all ports on the
switch are members of VLAN 1. However, the management station can be attached to a port
belonging to any VLAN, as long as that VLAN has been assigned an IP address. (Range: 1-4094)
Address Autoconfig
Enables stateless auto-configuration of an IPv6 address on an interface and enables IPv6
functionality on that interface. The network portion of the address is based on prefixes received in
IPv6 router advertisement messages, and the host portion is automatically generated using the
modified EUI-64 form of the interface identifier (i.e., the switch's MAC address).
• If a link local address has not yet been assigned to this interface, this command will dynamically
generate one. The link-local address is made with an address prefix in the range of FE80~FEBF
and a host portion based the switch's MAC address in modified EUI-64 format. It will also
generate a global unicast address if a global prefix is included in received router advertisements.
• When DHCPv6 is started, the switch may attempt to acquire an IP address prefix through
stateful address auto-configuration. If router advertisements have the
other stateful
configuration
flag set, the switch will attempt to acquire other non-address configuration
information (such as a default gateway).
• If auto-configuration is not selected, then an address must be manually configured using the
Add IPv6 Address page described below.
Enable IPv6 Explicitly
Enables IPv6 on an interface and assigns it a link-local address. Note that when an explicit address
is assigned to an interface, IPv6 is automatically enabled, and cannot be disabled until all assigned
addresses have been removed. (Default: Disabled)
Disabling this parameter does not disable IPv6 for an interface that has been explicitly configured
with an IPv6 address.
MTU
Sets the size of the maximum transmission unit (MTU) for IPv6 packets sent on an interface.
(Range: 1280-65535 bytes; Default: 1500 bytes)
• The maximum value set in this field cannot exceed the MTU of the physical interface, which is
currently fixed at 1500 bytes.
• If a non-default value is configured, an MTU option is included in the router advertisements sent
from this device. This option is provided to ensure that all nodes on a link use the same MTU
value in cases where the link MTU is not otherwise well known.
• IPv6 routers do not fragment IPv6 packets forwarded from other routers. However, traffic
originating from an end-station connected to an IPv6 router may be fragmented.
• All devices on the same physical medium must use the same MTU in order to operate correctly.
• IPv6 must be enabled on an interface before the MTU can be set. If an IPv6 address has not
been assigned to the switch, N/A is displayed in the MTU field.