Actiontec electronic GT701-WG Firewall Security Level Services Table, High Security Level, Ftp

Firewall Security	F
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 35). The types of ser- vices and their respective ports are listed in the two right-hand columns: the “In” column details whether a particular service can be accessed by a user outside of the network; and the “Out” column details whether a computer on the Gateway’s net- work can access a particular incoming service.

For example, in the “High Security Level” section below, the http service uses port 80. Since no is listed in the In column, a user outside the Gateway’s network can- 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., to host 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 NAT firewall.

☞Note: This stateful packet inspection firewall is based on the Globespan-Virata implementation and specification for release 8.2.

High Security Level

Service	Port	In	Out
http	80	no	yes
dns	53	no	yes
ftp	21	no	no
telnet	23	no	yes
smtp	25	no	yes
pop3	110	no	yes
nntp	119	no	no
real audio/video	7070	no	yes
icmp	n/a	no	yes
H.323	1720	no	no
T.120	1503	no	no
SSH	22	no	no

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