Linux IPv6 HOWTO (en)
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7.1. Displaying existing IPv6 routes

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

7.1.1. Using "ip"

Usage: 

# /sbin/ip -6 route show [dev <device>]

Example: 

# /sbin/ip -6 route show dev eth0
3ffe:ffff:0:f101::/64 proto kernel metric 256 mtu 1500 advmss 1440
fe80::/10             proto kernel metric 256 mtu 1500 advmss 1440
ff00::/8              proto kernel metric 256 mtu 1500 advmss 1440
default               proto kernel metric 256 mtu 1500 advmss 1440

7.1.2. Using "route"

Usage: 

# /sbin/route -A inet6

Example (output is filtered for interface eth0). Here you see different IPv6 routes for different addresses on a single interface. 

# /sbin/route -A inet6 |grep -w "eth0"
3ffe:ffff:0:f101 ::/64 :: UA  256 0 0 eth0 <- Interface route for global
¬ address
fe80::/10        ::       UA  256 0 0 eth0 <- Interface route for link-local
¬ address
ff00::/8         ::       UA  256 0 0 eth0 <- Interface route for all multicast
¬ addresses
::/0             ::       UDA 256 0 0 eth0 <- Automatic default route
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