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Chapter 6 Edit Interface/Connection
Select Ethernet Configuration Type
6-16
Cisco Router and Security Device Manager 2.5 User’s Guide
OL-4015-12
IP Mask-Reply
ICMP mask reply messages are sent when a network device must know the subnet
mask for a particular subnetwork in the internetwork. ICMP mask reply messages
are sent to the device requesting the information by devices that have the
requested information. These messages can be used by an attacker to gain network
mapping information.
IP Unreachables
ICMP host unreachable messages are sent if a router receives a nonbroadcast
packet that uses an unknown protocol, or if the router receives a packet that it is
unable to deliver to the ultimate destination because it knows of no route to the
destination address. These messages can be used by an attacker to gain network
mapping information.
Select Ethernet Configuration Type
This window is displayed when you click an interface in the Interfaces and
Connections window and Cisco SDM cannot determine whether the interface is
configured as a LAN interface or as a WAN interface. When you configure an
interface using Cisco SDM, you designate it as an inside or outside interface, and
Cisco SDM adds a descriptive comment to the configuration file based on your
designation. If you configure an interface using the command-line interface
(CLI), the configuration will not include this descriptive comment, and Cisco
SDM will not have this information.
To Indicate that the Interface is a LAN Interface:
Click LAN, and then click OK. Cisco SDM adds the comment line $ETH-LAN$
to the interface configuration, and the interface appears in the LAN wizard
window with the designation Inside in the Interfaces and Connections window.
To Indicate that the Interface is a WAN Interface:
Click WAN, and then click OK. Cisco SDM adds the comment line $ETH-WAN$
to the interface configuration, and the interface appears in the WAN wizard
window with the designation Outside in the Interfaces and Connections window.