1. Displaying existing IPv6 addresses

1. Displaying existing IPv6 addresses
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First you should check, whether and which IPv6 addresses are already configured (perhaps auto-magically during stateless auto-configuration).

Just note that addresses beginning with ”fec0” are deprecated, but shown here for completness!

1.1. Using "ip"

Usage:

# /sbin/ip -6 addr show dev <interface>

Example for a static configured host:

# /sbin/ip -6 addr show dev eth0
2: eth0: <BROADCAST,MULTICAST,UP&gt; mtu 1500 qdisc pfifo_ fast qlen 100
inet6 fe80::210:a4ff:fee3:9566/10 scope link
inet6 2001:0db8:0:f101::1/64 scope global
inet6 fec0:0:0:f101::1/64 scope site

Example for a host which is auto-configured

Here you see some auto-magically configured IPv6 addresses and their lifetime.

# /sbin/ip -6 addr show dev eth0 
3: eth0: <BROADCAST,MULTICAST,PROMISC,UP&gt; mtu 1500 qdisc pfifo_fast qlen
¬ 100 
inet6 2002:d950:f5f8:f101:2e0:18ff:fe90:9205/64 scope global dynamic 
valid_lft 16sec preferred_lft 6sec 
inet6 3ffe:400:100:f101:2e0:18ff:fe90:9205/64 scope global dynamic 
valid_lft 2591997sec preferred_lft 604797sec inet6 fe80::2e0:18ff:fe90:9205/10
¬ scope link

1.2. Using "ifconfig"

Usage:

# /sbin/ifconfig <interface>

Example (output filtered with grep to display only IPv6 addresses). Here you see different IPv6 addresses with different scopes.

# /sbin/ifconfig eth0 |grep "inet6 addr:"
inet6 addr: fe80::210:a4ff:fee3:9566/10 Scope:Link
inet6 addr: 2001:0db8:0:f101::1/64 Scope:Global
inet6 addr: fec0:0:0:f101::1/64 Scope:Site