P-2608HWL-Dx Series User’s Guide
Chapter 16 Firewall Configuration
201
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.
16.3.3 Key Fields For Configuring Rules
16.3.3.1 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.
16.3.3.2 Service
Select the service from the
Service
scrolling list box. If the service is not listed, it is necessary
to first define it. See
for more information on predefined services.
16.3.3.3 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?
16.3.3.4 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?
16.4 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). 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.
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Страница 206: ...P 2608HWL Dx Series User s Guide 206 Chapter 16 Firewall Configuration Figure 107 Firewall Edit Rule ...
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Страница 257: ...P 2608HWL Dx Series User s Guide Chapter 19 Certificates 257 Figure 138 My Certificate Details ...
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Страница 378: ...P 2608HWL Dx Series User s Guide 378 Appendix B Setting up Your Computer s IP Address ...
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