Not in ssh_config or sshd_config or ~/.ssh/config. You would put it in the /home/user/.ssh/authorized_keys file right before your key.
from="host.com".
Not: Host from="host.com"
Your authorized_keys file with 1 key would look like:
--8<--
from="my.host.com,my.2ndhost.com" Your_Key_Here(keys are longer than this example of course.).
--8<--
----- Original Message ----
> From: László Monda <laci@xxxxxxxx>
> To: secureshell@xxxxxxxxxxxxxxxxx
> Sent: Tuesday, June 10, 2008 9:26:50 AM
> Subject: Pattern specification trouble
>
> Hi List,
>
> `man ssh' says:
>
> ----8<----
>
> A pattern-list is a comma-separated list of patterns. Patterns within
> pattern-lists may be negated by preceding them with an exclamation mark
> (‘!’). For example, to allow a key to be used from anywhere within an
> organisation except from the “dialup” pool, the following entry (in
> authorized_keys) could be used:
>
> from="!*.dialup.example.com,*.example.com"
>
> ----8<----
>
> It is confusing to me because it specifies pattern syntax in the context
> of authorized_keys. I want to use patterns with the Host directive in
> ~/.ssh/config
>
> I've tried to use the following directives with no success:
>
> Host "wondeer.com,*.wondeer.com"
> Host wondeer.com,*.wondeer.com
> Host from="wondeer.com,*.wondeer.com"
>
> How should I use the damn thing?
>
> Thanks in advance.
>
> --
> Laci
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