Garmin HM210DP/DI manual Protocol, The following list describes each of the available protocols

Configuring Firewall Settings

Check the protocol type you want to block and click the Submit button. Make sure to use the Commit feature to save your changes to the permanent memory.

To unblock a specific protocol, uncheck the protocol and repeat the submit and commit tasks.

The following list describes each of the available protocols:

Protocol	Description
PPPoE	Point-to-Point Protocol over Ethernet. Many DSL
	modems use PPPoE to establish and maintain a
	connection with a service provider. PPPoE provides a
	means of logging in to the ISPs servers 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. This IP
	protocol provides a way for computers to determine
	their own IP addresses when they only know their

EN/LZT 108 6492 R2 - October 2003 91