Bug#295731: ssh fails to bind link-scope IPv6 addresses

[Chaskiel M Grundman <cg2v@andrew.cmu.edu>]

> # ssh -6 fe80::2xx:xxff:fexx:xxxx
> ssh: connect to host fe80::2xx:xxff:fexx:xxxx port 22: Invalid argument
This is not a bug in sshd. It is arguably a bug in the ssh client.

Since any given link-local address can potentially exist on all 
non-loopback interfaces on a host,  you need to identify which interface 
you are connecting to. Applications are supposed to do this by setting 
sin6_scope_id in the struct sockaddr_sin6 passed to connect() [RFC3493], 
but that requires the application to be more ipv6-aware than you get by 
just calling getnameinfo()

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