[OpenWrt-Devel] IPv6-question / fe80 / linklocal / uniq?

[Gui Iribarren]

On 22/07/14 06:50, Bastian Bittorf wrote:
> when reading http://en.wikipedia.org/wiki/IPv6#Link_local_address
> it seems to me, that the linklocal-address should be uniq,
> but here:
> 
> root at box:~ ip neigh | grep ^'fe80::' | grep "lladdr $mac"
> fe80::1cfc:fe65:769:3784 dev wlan0 lladdr 84:b1:53:b2:b8:b3 STALE
> fe80::cea:3b47:5812:96be dev wlan0 lladdr 84:b1:53:b2:b8:b3 STALE

different link-local addresses, same MAC address. nothing wrong about that

try doing "ip a add fe80::1234/64 dev eth0" in your laptop or wherever;
voila! you have an extra, manually-set link-local address, that resolves
to the same MAC address (when asked by icmpv6)

the "uniqueness" of the link-local address you mention, means there
should not be two different computers/devices with the same ipv6 address
on the same collision domain.

It does not mean that a host must have only 1 link-local address.

> 
> why this? bye, bastian
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