08-20-2002
Do you mean that your Unix host has 3 LAN connections (interfaces) and acts as a hub ?? If yes, then NAT is available between the interfaces so long as each is defined with a different subnet address. Best Linux example is the use of 'ipchains' for configuring simple NATing rules (IP Masquerade) and configuring your host to act as a router between the subnets. See
http://www.tldp.org/HOWTO/IP-Masquerade-HOWTO/
If you have a seperate piece of network equipment, i.e. a hub, then I would suspect that the answer is no. You will need to purchase a piece of equipment with NAT capability, i.e. a router.
Leigh
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LEARN ABOUT OSX
internetsharing
InternetSharing(8) BSD System Manager's Manual InternetSharing(8)
NAME
InternetSharing -- simple NAT/router configuration daemon
SYNOPSIS
InternetSharing -d
DESCRIPTION
InternetSharing is the back-end for the Internet Sharing feature. It is responsible for configuring the network interfaces, the DHCP server
bootpd(8), the network address translation daemon natd(8), and the Internet domain name server named(8). named(8) is run in caching-only
mode and allows the DHCP server to always offer the same DNS server address to the DHCP clients, regardless of the value of the actual DNS
server addresses.
The single command line option -d places additional debugging information to stdout/stderr.
InternetSharing is launched by launchd(8) both at start-up and when the user turns Internet Sharing on in the Sharing preferences pane.
By default, InternetSharing configures the IP addresses for non-AirPort interfaces starting at 192.168.2.1, walking up by one class C network
(subnet mask 255.255.255.0) for each subsequent interface i.e. 192.168.3.1, 192.168.4.1, 192.168.5.1, and so on. The AirPort interface by
default is assigned 10.0.2.1.
CONFIGURATION
InternetSharing reads the property list com.apple.nat.plist stored in the /Library/Preferences/SystemConfiguration.
Details of the com.apple.nat.plist are subject to change and are not completely documented here. The plist is a contract between the Sharing
preferences pane and InternetSharing. Any details provided here are for informational purposes only.
The plist is a dictionary with a single sub-dictionary called NAT containing properties to control which interfaces to use and other set-
tings. It may also have a sub-dictionary called AirPort that is used to configure the AirPort interface when it is put into access point
mode.
One property worth mentioning is SharingNetworkNumberStart. This property controls the behavior of InternetSharing when it configures IP
addresses for the local interfaces. The property is encoded as a string containing the dotted decimal network IP address, assumed to be a
class C network. For example:
<key>SharingNetworkNumberStart</key>
<string>192.168.100.0</string>
If the SharingNetworkNumberStart appears directly in the NAT dictionary, it controls the starting IP address chosen for the non-AirPort
interfaces. If the property appears within the AirPort sub-dictionary, it controls the IP address assigned to the AirPort interface.
The purpose of the property is to allow the user to avoid address collisions with existing NAT'd networks.
SEE ALSO
bootpd(8), launchd(8), natd(8), named(8)
Mac OS X Feburary 26, 2007 Mac OS X