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Linux IPv6 HOWTO (en)
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6.2. Add an IPv6 address

Adding an IPv6 address is similar to the mechanism of "IP ALIAS" addresses in Linux IPv4 addressed interfaces.

6.2.1. Using "ip"

Usage: 

# /sbin/ip -6 addr add <ipv6address>/<prefixlength> dev <interface>

Example:

# /sbin/ip -6 addr add 2001:0db8:0:f101::1/64 dev eth0

6.2.2. Using "ifconfig"

Usage: 

# /sbin/ifconfig <interface> inet6 add <ipv6address>/<prefixlength>

Example:

# /sbin/ifconfig eth0 inet6 add 2001:0db8:0:f101::1/64
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