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Just as an IP address specifies a particular computer on a network, ports are addresses that specify a
particular service in a computer. There are many universally agreed-upon ports assigned to various services.
For example:
Web servers typically use port number 80
All FTP servers use port number 21
Telnet uses port number 23
SNMP uses port number 161
To help direct incoming IP traffic to the appropriate server, the Netopia R7100 lets you associate these and
other port numbers with distinct IP addresses on your internal LAN using exported services. See
page 9-11
for details.
Advanced IP/IPX router configuration options
Advanced users can optionally use connection profiles to configure the IP and IPX protocol stack interfaces on
the SDSL link. You need not explicitly define these parameters, however. The following information is provided
as reference to the possible router configurations advanced users may desire.
The IP router interface on the SDSL link:
may be numbered or unnumbered.
may or may not use Network Address Translation (NAT).
will attempt to autoconfigure itself without an explicitly configured connection profile, if permitted to do so
by the setting of the Must Match a Defined Profile item in the Default Profile screen. See
profile" on page
8-3.
The link up procedure at the interface between the SDSL data link encapsulation module and the IP router
functions as follows:
When the SDSL data link comes up, the router will search for a configured connection profile that specifies
SDSL encapsulation.
If more than one SDSL profile exists, the router will use the first such profile.
If no SDSL profile exists, and the Must Match a Defined Profile field in the Default SDSL Profile is set to No,
the router will construct a Default Profile, and the link up process will continue using this constructed
profile as if it were an explicitly configured one.
If no SDSL profile exists, and the Must Match a Defined Profile field in the Default SDSL Profile is set to
Yes, IP will not come up on the SDSL link. The router will log an "IP connection refused" event in the WAN
Event History.
If an SDSL profile exists (or a default one has been constructed), the router will attempt to configure its
interface on the SDSL link using the information stored in the profile.
IP Setup and Network Address Translation 9-7
"IP setup" on
"The default
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