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Security Level
Services Table
The following information is related to the Firewall options (High, Medium, and
Low) in the "Advanced Services" chapter of this manual (page
services and their respective ports are listed in the two right-hand columns; the
"In" column details if a particular service can be accessed by a user outside of the
network; and the "Out" column informs whether a computer on the Gateway's
network can access a particular incoming service.
For example, in the "High Security Level" section below, the http service uses port
. Since no is listed in the In column, a user outside the Gateway's network can-
80
not access a computer on the network via the http service; in this case, no comput-
ers on the network can be used as a Web server (i.e., hosting a Web site accessible
to outside users). However, since yes is listed in the Out column, all computers on
the Gateway's network can access the Internet via the http port.
If Basic Security is selected in the "Firewall" screen, firewall filtering is based on the
basic
firewall.
NAT
Note: This stateful packet inspection firewall is based on the
Globespan-Virata implementation and specification for release
High Security Level
Service
http
dns
ftp
telnet
smtp
pop3
nntp
real audio/video
icmp
H.323
T.120
SSH
Port
80
53
21
23
25
110
119
7070
n/a
1720
1503
22
129
In
no
no
no
no
no
no
no
no
no
no
no
no
F
). The types of
35
.
8.2
Out
yes
yes
no
yes
yes
yes
no
yes
yes
no
no
no
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