Match on AddressFamily

[Marc Haber]

Hi,

I have in my client config:

Match Localnetwork 2001:db8:43fa:bc82::/64
   BindAddress 2001:db8:43fa:bc82::1f:100

to ask my ssh client to use a static address instead of the privacy IPv6 
address when I am at my home network.

Sadly, this results in "Address family for hostname not supported" when 
I try to ssh out to a server that doesn't have IPv6.

I would like to have a Match on the Address Family of the outgoing 
connection, so that I can write like:

Match RemoteAddressFamily inet6 Localnetwork 2001:db8:43fa:bc82::/64
   BindAddress 2001:db8:43fa:bc82::1f:100

to make this BindAddress only effective when the outgoing connection 
will actually use IPv6.

I can use "Match Exec", but that needs DNS lookups every time I ssh out. 
I'd prefer the ssh client to have this kind of flexibility.

It would also be fine if BindAddress would just be honored if the 
Address Family of the chosen target address matches. I cannot imagine 
that it is the intended behavior to make all connections to IPv4 hosts 
impossible when BindAddress is used.

It would be great if I was wrong. If so, please indicate how I can have 
what I want with current OpenSSH. I would be happy if that is possible.

Thanks for your consideration.

Greetings
Marc

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