>> i've restricted port 22 to a chosen few IP's, and run an additional ssh on
>> another port that has different restrictions.  i'd love if i could do both
>> with just one instance, did i miss something?
>>
>> the problem with multiple instances is with yum updates.  at first i had a
>> customized /etc/init.d/sshd that started both instances, but every ssh
>> update would replace it.  now i have a second start script for the second
>> port, but still, ssh updates kill both and only restart port 22.  what is a
>> better solution?
>
> Take a look at the "match" configuration option. Perhaps you can do what you
> need in one instance with that?

now that you mention it, perhaps so.  matching by port isn't
available, so on first look i passed it by, tho perhaps i could manage
by matching on the address..