Linux IPv6 HOWTO
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7.4. Add an IPv6 route through an interface

Not often needed, sometimes in cases of dedicated point-to-point links.

7.4.1. Using "ip"

Usage: 

# /sbin/ip -6 route add <ipv6network>/<prefixlength> dev <device>
ΒΌ metric 1

Example: 

# /sbin/ip -6 route add 2000::/3 dev eth0 metric 1

Metric "1" is used here to be compatible with the metric used by route, because the default metric on using "ip" is "1024".

7.4.2. Using "route"

Usage: 

# /sbin/route -A inet6 add <network>/<prefixlength> dev <device>

Example: 

# /sbin/route -A inet6 add 2000::/3 dev eth0
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