User's Guide

3e-531AP Wireless Access Point Chapter 4 Gateway Conguration
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3e-531AP Wireless Access Point Chapter 4: Gateway Conguration
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cic IP Address.
Port Filtering
Port ltering permits you to congure the Gateway to block outbound
trafc on specic ports. It can be used to block the wireless network from
using specic protocols on the network.
Following is a list of well known TCP and UDP ports.
Port Range Protocol
20-21 FTP
23 Telnet
25 SMTP (Simple Mail Transfer
for email sending)
80 HTTP (World Wide Web)
110 POP3 (Post Ofce Protocol for
email receiving.)
Virtual Server
In order to protect the Private Network, the built-in NAT rewall
lters out trafc to the private network. Since all clients on the Private
Network are normally not visible to outside users, the virtual server func-
tion allows some clients on the Private Network to be accessed by outside