"by default" is what you compile in. look at -e flag for cpu, import, etc.
there's sshsrv for dealing with none plan9 systems.

On Wed Jan 07 2015 at 8:49:46 PM Yuning Feng <fengyuning1984@gmail.com>
wrote:

> Questions:
>
> 1. Is communication between servers encrypted by default?
> 2. How about between plan9port and native plan9?
> 3. Assuming the previous questions have positive answers, which part
> of the source shall I browse to convince myself?
>
> Thanks!
>
> yuning
>
>