User`s guide

SpeedStream Wireless DSL Gateway Advanced Features
81
To use address translation with NAPT:
1. Click the "Configure" hyperlink next to the "Port-Bypass (NAPT)" option.
2. Click the option(s) of your choice from the list under the "Available Applications" heading. Once
clicked, these applications appear under the "Enabled Applications" heading indicating they are now
active. NAPT is used to allow multiple users access to Internet applications while masking their IP
addresses from outside users.
3. Optionally, click the "Add a custom bypass entry" hyperlink. This option allows you to configure
special port access to the Internet.
4. Under the "Add/Edit Entry" heading, select one of the following options from the "Select service by
name" drop-down:
• Telnet: Telnet is a program that allows you to connect to other computers over the Internet. This
options uses port 23.
• FTP (File Transfer Protocol): FTP is used to transfer files in both ASCI and Binary format
between local and remote devices. This option uses port 21.
• HTTP (Hyper Text Transfer Protocol): HTTP is the standard method of transferring all types of
information over the Internet. This option uses port 80.
• SNMP (Signaling Network Management Protocol): SNMP is a protocol used by network
management applications to help manage a network. This option uses port 161.
• SMTP: (Simple Mail Transfer Protocol): SMTP is used for sending email between servers. This
port uses port 25.
• PPTP (Point-to-Point Tunneling Protocol): PPTP is a protocol that allows VPN (Virtual Private
Network) applications. This option uses port 1723.
• Domain: Domain is used for DNS options. This option uses port 53.
5. Optionally, instead of selecting a service in step 4, you can select a protocol and specifiy port
numbers. Select one of the following options from the "Select protocol" drop-down:
• TCP: (Transmission Control Protocol) Provides reliable, sequenced, and unduplicated delivery of
bytes to a remote or local user.
• UDP: (User Datagram Protocol) A connectionless mode protocol that provides the delivery of
packets to a remote or local user.
• ICMP: (Internet Control Message Protocol) A method by which IP software on a host or gateway
can communicate to pass information to other machines.
• GRE: (Generic Routing Encapsulation) This protocol is used to provide tunneling for a VPN
connection.
• If you are using the protocol option in step 5, type the range of UDP or TCP ports in the boxes
next to the "and TCP/UDP port(s)" heading.
6. Select one of the following options:
• Redirect selected protocol/service to this router
: The protocol or service that you select is
directed to your gateway.