RuggedCom RX1000, RX1100 manual ShoreWall Terminology And Concepts, Zones, Interfaces

RuggedRouter™ User Guide

7)If your hosts must accept sessions from the Internet configure the rules file to support Destination Network address Translation (DNAT). Which hosts need to accept connections, from whom and on which ports?

8)Configure the rules file to override the default policies. Have external connections been limited to approved IP address ranges. Have all but the required protocols been blocked?

9)If you are supporting a VPN, add additional rules.

10)Check the configuration using the Shorewall Firewall menu, “Check Firewall” button.

11)Activate the firewall. It is usually a good idea to port scan the firewall after activation and verify that logging is functioning.

ShoreWall Terminology And Concepts

This section provides background on various Shorewall terms and concepts. References are made to the section where configuration applies.

Zones

A network zone is a collection of interfaces, for which forwarding decisions are made, for example:

Name	Description
net	The Internet
loc	Your Local Network
dmz	Demilitarized Zone
fw	The firewall itself
vpn1	IPSec connections on w1ppp
vpn2	IPSec connections on w2ppp

You may create new zones if you wish. For example if all of your Ethernet interfaces are part of the local network zone, disallowing traffic from the Internet zone to the local zone will disallow it to all Ethernet interfaces. If you wanted some interfaces (but not others) to access the Internet, you could create another zone.

Zones are defined in the file /etc/shorewall/zones and are modified from the Network Zones menu.

Interfaces

Shorewall Interfaces are simply the Ethernet and WAN interfaces available to the router. You must place each interface into a network zone.

If an interface supports more than one subnet, place the interface in zone 'Any' and use the zone hosts setup (see below) to define a zone for each subnet on the interface.

An example follows:

Interface	Zone
eth1	loc
eth2	loc
eth3	Any
eth4	dmz
w1ppp	net

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