ZyXEL NWA1123-NI User Guide - Page 181

Appendix D IPv6

NWA1120 Series User’s Guide

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such as the system name. The interface-ID option provides slot number, port information and the

VLAN ID to the DHCPv6 server. The remote-ID option (if any) is stripped from the Relay-Reply

messages before the relay agent sends the packets to the clients. The DHCP server copies the

interface-ID option from the Relay-Forward message into the Relay-Reply message and sends it to

the relay agent. The interface-ID should not change even after the relay agent restarts.

Prefix Delegation

Prefix delegation enables an IPv6 router to use the IPv6 prefix (network address) received from the

ISP (or a connected uplink router) for its LAN. The NWA uses the received IPv6 prefix (for example,

2001:db2::/48) to generate its LAN IP address. Through sending Router Advertisements (RAs)

regularly by multicast, the NWA passes the IPv6 prefix information to its LAN hosts. The hosts then

can use the prefix to generate their IPv6 addresses.

ICMPv6

Internet Control Message Protocol for IPv6 (ICMPv6 or ICMP for IPv6) is defined in RFC 4443.

ICMPv6 has a preceding Next Header value of 58, which is different from the value used to identify

ICMP for IPv4. ICMPv6 is an integral part of IPv6. IPv6 nodes use ICMPv6 to report errors

encountered in packet processing and perform other diagnostic functions, such as "ping".

Neighbor Discovery Protocol (NDP)

The Neighbor Discovery Protocol (NDP) is a protocol used to discover other IPv6 devices and track

neighbor’s reachability in a network. An IPv6 device uses the following ICMPv6 messages types:

•

Neighbor solicitation: A request from a host to determine a neighbor’s link-layer address (MAC

address) and detect if the neighbor is still reachable. A neighbor being “reachable” means it

responds to a neighbor solicitation message (from the host) with a neighbor advertisement

message.

•

Neighbor advertisement: A response from a node to announce its link-layer address.

•

Router solicitation: A request from a host to locate a router that can act as the default router and

forward packets.

•

Router advertisement: A response to a router solicitation or a periodical multicast advertisement

from a router to advertise its presence and other parameters.

IPv6 Cache

An IPv6 host is required to have a neighbor cache, destination cache, prefix list and default router

list. The NWA maintains and updates its IPv6 caches constantly using the information from

response messages. In IPv6, the NWA configures a link-local address automatically, and then sends

a neighbor solicitation message to check if the address is unique. If there is an address to be

resolved or verified, the NWA also sends out a neighbor solicitation message. When the NWA

receives a neighbor advertisement in response, it stores the neighbor’s link-layer address in the

neighbor cache. When the NWA uses a router solicitation message to query for a router and

receives a router advertisement message, it adds the router’s information to the neighbor cache,

prefix list and destination cache. The NWA creates an entry in the default router list cache if the

router can be used as a default router.

When the NWA needs to send a packet, it first consults the destination cache to determine the next

hop. If there is no matching entry in the destination cache, the NWA uses the prefix list to

Section	Page
NWA1120 Series	1
Contents Overview	3
Table of Contents	5
User’s Guide	9
Introducing the NWA	11
1.1 Introducing the NWA	11
1.1.1 Dual-Band	12
1.2 Wireless Modes	12
1.2.1 MBSSID	12
1.2.2 Wireless Client	13
1.2.3 Root AP	15
1.2.4 Repeater	15
1.3 Ways to Manage the NWA	16
1.4 Configuring Your NWA’s Security Features	17
1.4.1 Control Access to Your Device	17
1.4.2 Wireless Security	17
1.5 Good Habits for Managing the NWA	17
1.6 Hardware Connections	18
1.7 LED	18
Introducing the Web Configurator	19
2.1 Accessing the Web Configurator	19
2.2 Resetting the NWA	20
2.2.1 Methods of Restoring Factory-Defaults	21
2.3 Navigating the Web Configurator	22
2.3.1 Title Bar	22
2.3.2 Navigation Panel	23
2.3.3 Main Window	24
Dashboard	25
3.1 The Dashboard Screen	25
Tutorial	29
4.1 How to Configure the Wireless LAN	29
4.1.1 Choosing the Wireless Mode	29
4.1.2 Further Reading	29
4.2 How to Configure Multiple Wireless Networks	29
4.2.1 Configure the SSID Profiles	31
4.2.2 Configure the Standard Network	33
4.2.3 Configure the VoIP Network	34
4.2.4 Configure the Guest Network	36
4.2.5 Testing the Wireless Networks	38
4.3 NWA Setup in AP and Wireless Client Modes	38
4.3.1 Scenario	38
4.3.2 Configuring the NWA in MBSSID or Root AP Mode	39
4.3.3 Configuring the NWA in Wireless Client Mode	42
4.3.4 MAC Filter Setup	44
4.3.5 Testing the Connection and Troubleshooting	45
Technical Reference	47
Monitor	49
5.1 Overview	49
5.2 What You Can Do	49
5.3 View Logs	49
5.4 Statistics	50
5.5 Association List	51
5.6 Channel Usage	52
Wireless LAN	55
6.1 Overview	55
6.2 What You Can Do in this Chapter	55
6.3 What You Need To Know	56
6.4 Wireless Settings Screen	60
6.4.1 Root AP Mode	61
6.4.2 Repeater Mode	65
6.4.3 Wireless Client Mode	68
6.4.4 MBSSID Mode	71
6.5 SSID Screen	74
6.5.1 Configuring SSID	75
6.6 Wireless Security Screen	76
6.6.1 Security: WEP	78
6.6.2 Security: WPA, WPA2, WPA2-MIX	79
6.6.3 Security: WPA-PSK, WPA2-PSK, WPA2-PSK-MIX	81
6.7 RADIUS Screen	82
6.8 Layer-2 Isolation	84
6.8.1 Layer-2 Isolation Screen	85
6.9 MAC Filter Screen	86
6.10 Technical Reference	88
6.10.1 Additional Wireless Terms	89
6.10.2 WMM QoS	89
6.10.3 Security Mode Guideline	90
LAN	91
7.1 Overview	91
7.2 What You Can Do in this Chapter	91
7.3 What You Need to Know	91
7.4 LAN IP Screen	93
VLAN	95
8.1 Overview	95
8.1.1 What You Can Do in This Chapter	95
8.2 What You Need to Know	95
8.3 VLAN Screen	96
System	97
9.1 Overview	97
9.2 What You Can Do in this Chapter	97
9.3 What You Need To Know	98
9.4 WWW Screen	100
9.5 Certificates Screen	101
9.6 Telnet Screen	102
9.7 SNMP Screen	104
9.8 FTP Screen	106
9.9 Technical Reference	107
9.9.1 MIB	107
9.9.2 Supported MIBs	108
9.9.3 Private-Public Certificates	108
9.9.4 Certification Authorities	108
9.9.5 Checking the Fingerprint of a Certificate on Your Computer	109
Log Settings	111
10.1 Overview	111
10.2 What You Can Do in this Chapter	111
10.3 What You Need To Know	112
10.4 Log Settings Screen	112
Maintenance	115
11.1 Overview	115
11.2 What You Can Do in this Chapter	115
11.3 What You Need To Know	116
11.4 General Screen	116
11.5 Password Screen	117
11.6 Time Screen	118
11.7 Firmware Upgrade Screen	119
11.8 Configuration File Screen	120
11.8.1 Backup Configuration	120
11.8.2 Restore Configuration	120
11.8.3 Back to Factory Defaults	121
11.9 Restart Screen	121
Troubleshooting	123
12.1 Power, Hardware Connections, and LEDs	123
12.2 NWA Access and Login	124
12.3 Internet Access	125
12.4 Wireless LAN	126
Setting Up Your Computer’s IP Address	129
Pop-up Windows, JavaScript and Java Permissions	157
IP Addresses and Subnetting	169
IPv6	177
Wireless LANs	187
Legal Information	201

ZyXEL NWA1123-NI User Guide - Page 181

Prefix Delegation, ICMPv6, Neighbor Discovery Protocol NDP, IPv6 Cache

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