Firewall Security | F |
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Level Services Table |
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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
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.
High Security Level
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 |
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