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The following table describes the protocol options in this screen.
PROTOCOL
PPPoE
Many DSL modems use Point-to-Point Protocol over Ethernet ( PPPoE) to establish and
maintain a connection with an ISP. PPPoE provides a means of logging in to the ISP's
server so that they can authenticate you as a customer and provide you access to the
Internet. Check with your ISP before blocking this protocol.
IP Multicast
IP Multicast is an extension to the IP protocol. It enables individual packets to be sent to
multiple hosts on the Internet, and is often used for handling e-mail mailing lists and
teleconferencing/videoconferencing.
RARP
Reverse Address Resolution Protocol (RARP) is an IP protocol that provides a way for
computers to determine their own IP addresses when they only know their hardware
address (i.e., MAC addresses). Certain types of computers, such as diskless
workstations, must use RARP to determine their IP address before communicating with
other network devices.
Firewall
Figure 14-3 Blocked Protocols
Table 14-3 Blocked Protocols
DESCRIPTION
Prestige 623 Series Dual-link ADSL Router
14-5
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Troubleshooting
