ZyXEL P-660HW-T1 v2 User Guide - Page 151
Connection Direction
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P-660HW-T v2 User's Guide 4 Does a rule that allows Internet users access to resources on the LAN create a security vulnerability? For example, if FTP ports (TCP 20, 21) are allowed from the Internet to the LAN, Internet users may be able to connect to computers with running FTP servers. 5 Does this rule conflict with any existing rules? 6 Once these questions have been answered, adding rules is simply a matter of plugging the information into the correct fields in the web configurator screens. 10.3.3 Key Fields For Configuring Rules 10.3.3.1 Action Should the action be to Drop, Reject or Permit? Note: "Drop" means the firewall silently discards the packet. "Reject" means the firewall discards packets and sends an ICMP destination-unreachable message to the sender. 10.3.3.2 Service Select the service from the Service scrolling list box. If the service is not listed, it is necessary to first define it. See Section 10.8 on page 163 for more information on predefined services. 10.3.3.3 Source Address What is the connection's source address; is it on the LAN or WAN? Is it a single IP, a range of IPs or a subnet? 10.3.3.4 Destination Address What is the connection's destination address; is it on the LAN or WAN? Is it a single IP, a range of IPs or a subnet? 10.4 Connection Direction This section describes examples for firewall rules for connections going from LAN to WAN and from WAN to LAN. LAN to LAN/ Router and WAN to WAN/ Router rules apply to packets coming in on the associated interface (LAN or WAN respectively). LAN to LAN/ Router means policies for LAN-to-ZyXEL Device (the policies for managing the ZyXEL Device through the LAN interface) and policies for LAN-to-LAN (the policies that control routing between two subnets on the LAN). Similarly, WAN to WAN/ Router polices apply in the same way to the WAN port. Chapter 10 Firewall Configuration 151