Ipv6; C Ha Pte R 12 Ipv6; Ipv6 Overview; What You Can Do In This Chapter - ZyXEL Communications NBG6515 User Manual

12.1 IPv6 O ve rvie w
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
Use the

IPv6

12.1.1 Wha t Yo u C a n Do in this C ha pte r
• Use the
G e ne ra l
12.1.2 Wha t Yo u Ne e d to Kno w
IPv6 Addre ssing
An 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.
Pre fix a nd Pre fix L e ng th
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) from the left is the network prefix.
L ink- lo c a l Addre ss
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-
screens to configure the IP address for your NBG on the LAN or on the WAN.
screen (Section 12.2 on page
NBG6515 User's Guide
C
HA PTER
97) to configure the IPv6 connection type.
95
1 2
IPv6
38
IP addresses.