Cabletron Systems Cabletron SmartSwitch Router 250 - Manual (Page 16)

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If IP routing and NAT are enabled, you will be prompted to
enter a Source WAN IP Address. You will obtain this
information from your ISP or your Network Administrator.
If NAT is OFF, you may still need to enter Source WAN IP
Address information. You will obtain this information from
your ISP or your Network Administrator.
• RFC 1483MER (MAC Encapsulated Routing)
If MER is selected, you will be prompted to enter a Source
WAN IP Address. You will obtain this information from
your ISP or your Network Administrator.
3. Internet Account (PPP only)
Enter the following information to configure your router for
accessing the Internet:
• User Name
• Password
4. DNS Information
Enter this information (available from your ISP) for accessing
the Internet.