User Guide

McAfee Firewall
138 McAfee Office
Systems
Control system
The operating system performs many types of network communication
without reporting directly to the user. McAfee Firewall lets the user allow or
block d ifferent system functions explicitly. Settings may b e d ifferent for each
networkdevice ,sinceaPCmay,fore xa mple,beonanint e rnal networkaswell
as having a dia l-up connection to the Int erne t.
TocontrolSystemsettings,clickontheSettingsmenuitemandchooseSystem.
Then choose the network device you want to configure.
Default settings for System activity
NetBIOS over TCP: Blocked
Th is will block all fileshare activity over T CP as well as UDP broadcasts. Your
system w ill not appear in a nyone's "Network Neighborhood" and theirs will
not appear in yours. If y our system is configured to s uppo rt Ne t BIOS o ver
other protocols, such as IPX or NetBEUI, then filesharing may be allowed if
"non-IP protocols" are allowed(see "Other Protocols" below).
Identification: Allowed
Th is service is often required when getting email a nd is required by most IRC
servers.
ICMP: Blocked
This protocol is often abus ed as a method of breaking peo ple's network
connections (especially on IRC).
ARP: Allowed
ARP is a necessary Ethe rnet protocol and is not known to be a t hreat.
DHCP: Allowed if your system uses DHCP
The program looks in your system Registry to see if one of your network
devices uses DHCP. If so, then DHCP isallowed for alldevices. If not, then it
is blocked for all devices.If you have more than one network device and one
uses DHCP, you should check the DHCP setting for each device and allow
only for the device that uses (most often cable or ADSL modems and some
internal networks, not for dial-up).
RIP: Blocked
Allow RIP if your adminstrator or ISP advises you to.