Newbie <newbie@newbie.it> wrote:
>> 1. The first one is to prevent users from seeing information about
>> processes that are being run under another UID.
>
> You can modify ps, top source code. Of course is not a perfect
> solution.

Alternatively, search the misc@openbsd.org archives for a more
comprehensive patch.

>> 6. Enable stealth forwarding. Stealth forwarding passes packets
>> without touching the TTL, so this is useful for hiding firewalls from
>> traceroutes.
>
> I don't know how to make this with open.

Configure your firewall as a bridge.

Joachim