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Firewall
Firewall presets
The easiest way to use the firewall is to use one of the preset settings. Two levels of security
are provided:
High: Permits all outgoing traffic, except NetBIOS (TCP and UDP). Blocks all externally
initiated connections.
Low: Permits all incoming and outgoing traffic, except for NetBIOS traffic. Use this
option if you require active FTP sessions.
The following tables indicate how some common applications are affected by the preset
firewall settings.
Outgoing traffic
Firewall setting
Application Low High
FTP (passive mode) Passed
Passed
Passed
Passed
Passed
Blocked
Passed
Passed
Passed
Passed
Blocked
FTP (active mode)
Web (HTTP, HTTPS)
SNMP
Telnet
Windows networking
ping
PPTP from client station to remote server
NetMeeting (make call)
IPSec pass-through
NetBIOS
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