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ADSL Router Series User’s Guide
341
A
PPENDIX
E
IPv6
Overview
IPv6 (Internet Protocol version 6), is designed to enhance IP address size and features. The
increase in IPv6 address size to 128 bits (from the 32-bit IPv4 address) allows up to 3.4 x 10
38
IP
addresses.
IPv6 Addressing
The 128-bit IPv6 address is written as eight 16-bit hexadecimal blocks separated by colons (:). This
is an example IPv6 address
2001:0db8:1a2b:0015:0000:0000:1a2f:0000
.
IPv6 addresses can be abbreviated in two ways:
• Leading zeros in a block can be omitted. So
2001:0db8:1a2b:0015:0000:0000:1a2f:0000
can
be written as
2001:db8:1a2b:15:0:0:1a2f:0
.
• Any number of consecutive blocks of zeros can be replaced by a double colon. A double colon can
only appear once in an IPv6 address. So
2001:0db8:0000:0000:1a2f:0000:0000:0015
can be
written as
2001:0db8::1a2f:0000:0000:0015
,
2001:0db8:0000:0000:1a2f::0015
,
2001:db8::1a2f:0:0:15
or
2001:db8:0:0:1a2f::15
.
Prefix and Prefix Length
Similar to an IPv4 subnet mask, IPv6 uses an address prefix to represent the network address. An
IPv6 prefix length specifies how many most significant bits (start from the left) in the address
compose the network address. The prefix length is written as “/x” where x is a number. For
example,
2001:db8:1a2b:15::1a2f:0/32
means that the first 32 bits (
2001:db8
) is the subnet prefix.
Link-local Address
A link-local address uniquely identifies a device on the local network (the LAN). It is similar to a
“private IP address” in IPv4. You can have the same link-local address on multiple interfaces on a
device. A link-local unicast address has a predefined prefix of fe80::/10. The link-local unicast
address format is as follows.
Table 118
Link-local Unicast Address Format
1111 1110 10
0
Interface ID
10 bits
54 bits
64 bits
Summary of Contents for P-660H-61
Page 2: ......
Page 6: ...Document Conventions ADSL Router Series User s Guide 6 Server Firewall Telephone Router Switch...
Page 8: ...Safety Warnings ADSL Router Series User s Guide 8...
Page 10: ...Contents Overview ADSL Router Series User s Guide 10...
Page 20: ...Table of Contents ADSL Router Series User s Guide 20...
Page 21: ...21 PART I User s Guide...
Page 22: ...22...
Page 28: ...Chapter 1 Introduction ADSL Router Series User s Guide 28...
Page 40: ...Chapter 3 Status Screens ADSL Router Series User s Guide 40...
Page 76: ...Chapter 4 Tutorials ADSL Router Series User s Guide 76...
Page 77: ...77 PART II Technical Reference...
Page 78: ...78...
Page 150: ...Chapter 8 Wireless LAN ADSL Router Series User s Guide 150...
Page 198: ...Chapter 13 Static Route ADSL Router Series User s Guide 198...
Page 202: ...Chapter 14 Port Binding ADSL Router Series User s Guide 202...
Page 208: ...Chapter 15 802 1Q 1P ADSL Router Series User s Guide 208...
Page 258: ...Chapter 21 Sharing a USB Printer ADSL Router Series User s Guide 258...
Page 262: ...Chapter 22 CWMP ADSL Router Series User s Guide 262...
Page 266: ...Chapter 23 System Settings ADSL Router Series User s Guide 266...
Page 270: ...Chapter 24 Logs ADSL Router Series User s Guide 270...
Page 326: ...Appendix C Pop up Windows JavaScripts and Java Permissions ADSL Router Series User s Guide 326...
Page 340: ...Appendix D Wireless LANs ADSL Router Series User s Guide 340...
Page 350: ...Appendix E IPv6 ADSL Router Series User s Guide 350...
Page 362: ...Appendix G Legal Information ADSL Router Series User s Guide 362...