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Old 11-01-2011
A subnet acts like a logical bus. As far as the machines are concerned, they're all hooked to one long wire which connects to every machine. No hosts are more or less direct than any other; handling the direction of traffic etc. becomes the switches' jobs. The switches handle this by comparing MAC addresses.

If you have advanced enough switches you may be able to pull the network organization from the switch itself, but unless it's an expensive switch that's unlikely.

If a big bus isn't the organization you want, you have to start using routers and break things into more subnets. (Router in the routing sense, not router in the linksys sense. You probably don't want NAT by the sounds of it.)
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LEARN ABOUT OSX

hosts.equiv

HOSTS.EQUIV(5)						      BSD File Formats Manual						    HOSTS.EQUIV(5)

NAME

     hosts.equiv, .rhosts -- trusted remote hosts and host-user pairs

DESCRIPTION

     The hosts.equiv and .rhosts files list hosts and users which are ``trusted'' by the local host when a connection is made via rlogind(8),
     rshd(8), or any other server that uses ruserok(3).  This mechanism bypasses password checks, and is required for access via rsh(1).

     Each line of these files has the format:

	   hostname [username]

     The hostname may be specified as a host name (typically a fully qualified host name in a DNS environment) or address, +@netgroup (from which
     only the host names are checked), or a ``+'' wildcard (allow all hosts).

     The username, if specified, may be given as a user name on the remote host, +@netgroup (from which only the user names are checked), or a
     ``+'' wildcard (allow all remote users).

     If a username is specified, only that user from the specified host may login to the local machine.  If a username is not specified, any user
     may login with the same user name.

EXAMPLES

     somehost
	   A common usage:  users on somehost may login to the local host as the same user name.
     somehost username
	   The	user  username	on  somehost may login to the local host.  If specified in /etc/hosts.equiv, the user may login with only the same
	   user name.
     +@anetgroup username
	   The user username may login to the local host from any machine listed in the netgroup anetgroup.
     +
     + +
	   Two severe security hazards.  In the first case, allows a user on any machine to login to the local host as the same user name.  In the
	   second case, allows any user on any machine to login to the local host (as any user, if in /etc/hosts.equiv).

WARNINGS

     The username checks provided by this mechanism are not secure, as the remote user name is received by the server unchecked for validity.
     Therefore this mechanism should only be used in an environment where all hosts are completely trusted.

     A numeric host address instead of a host name can help security considerations somewhat; the address is then used directly by iruserok(3).

     When a username (or netgroup, or +) is specified in /etc/hosts.equiv, that user (or group of users, or all users, respectively) may login to
     the local host as any local user.	Usernames in /etc/hosts.equiv should therefore be used with extreme caution, or not at all.

     A .rhosts file must be owned by the user whose home directory it resides in, and must be writable only by that user.

     Logins as root only check root's .rhosts file; the /etc/hosts.equiv file is not checked for security.  Access permitted through root's
     .rhosts file is typically only for rsh(1), as root must still login on the console for an interactive login such as rlogin(1).

FILES

     /etc/hosts.equiv  Global trusted host-user pairs list
     ~/.rhosts	       Per-user trusted host-user pairs list

SEE ALSO

     rcp(1), rlogin(1), rsh(1), rcmd(3), ruserok(3), netgroup(5)

HISTORY

     The .rhosts file format appeared in 4.2BSD.

BUGS

     The ruserok(3) implementation currently skips negative entries (preceded with a ``-'' sign) and does not treat them as ``short-circuit'' neg-
     ative entries.

BSD
								 November 26, 1997							       BSD