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The following information is related to the Firewall options (High, Medium, and

Low) section in the “Advanced Setup” chapter of this manual (see page 56). The

types of services and their respective ports are listed in the two right-hand col-

umns: 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 network 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.

Service Port In Out

http 80 no yes

dns 53 no yes

ftp 21 no no

telnet 23 no no

smtp 25 yes yes

pop3 110 yes yes

nntp 119 no no

real audio/video 7070 no no

icmp n/a no yes

H.323 1720 no no

T.120 1503 no no

SSH 22 no no

imap 163 yes yes

https 443 yes yes

secure imap 983 yes yes

secur pop3 885 yes yes

Actiontec electronic GT701WG user manual F