Motorola 3397GP manual Dhcp, Firewall Setting Off Low/Medium High

Administrator’s Handbook

As a device on the Internet, a Motorola Netopia® Gateway requires an IP address in order to send or receive traffic.

The IP traffic sent or received have an associated application port which is dependent on the nature of the connection request. In the IP protocol standard the following session types are common applica- tions:

❑	ICMP	❑	HTTP	❑	FTP
❑	SNMP	❑	telnet	❑	DHCP

By receiving a response to a scan from a port or series of ports (which is the expected behavior accord- ing to the IP standard), hackers can identify an existing device and gain a potential opening for access to an internet-connected device.

To protect LAN users and their network from these types of attacks, the Motorola Netopia® Firewall offers three levels of increasing protection.

The following tables indicate the state of ports associated with session types, both on the WAN side and the LAN side of the Gateway.

This table shows how inbound traffic is treated. Inbound means the traffic is coming from the WAN into the WAN side of the Gateway.

Gateway: WAN Side

	Firewall Setting >>	Off	Low/Medium*	High
Port	Session Type	--------------Port State-----------------------
20	ftp data	Enabled	Disabled	Disabled
21	ftp control	Enabled	Disabled	Disabled
23	telnet external	Enabled	Disabled	Disabled
23	telnet Netopia server	Enabled	Disabled	Disabled
80	http external	Enabled	Disabled	Disabled
80	http Netopia server	Enabled	Disabled	Disabled
67	DHCP client	Enabled	Enabled	Disabled
68	DHCP server	Not Applicable	Not Applicable	Not Applicable
161	snmp	Enabled	Disabled	Disabled
	ping (ICMP)	Enabled	Disabled	Disabled

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