Netopia 6.3 Software User's Manual page 71

As a device on the Internet, a Cayman 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 applications:
By receiving a response to a scan from a port or series of ports (which is the
expected behavior according to the IP standard), hackers can identify an
existing device and gain a potential opening for access to an internet-con-
nected device.
To protect LAN users and their network from these types of attacks, Break-
Water offers three levels of increasing protection.
The following tables indicate the state of ports associated with ses-
sion 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.
20 ftp data
21 ftp control
23 telnet external
23 telnet Cayman server
80 http external
80 http Cayman server
67 DHCP client
68 DHCP server
161 snmp
ping (ICMP)
ICMP HTTP
SNMP telnet
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Not Applicable
Enabled
Enabled
FTP
DHCP
Disabled Disabled
Disabled Disabled
Disabled Disabled
Disabled Disabled
Disabled Disabled
Disabled Disabled
Enabled Disabled
Not Applicable Not Applicable
Disabled Disabled
Disabled Disabled