Cisco 2821 Series Betrieb - Seite 13

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Configure the router

Define Rules and Filters Create packet Filters that are applied to User data streams on each

View Status Functions

Manage the router

Set Encryption/Bypass

Bypass Mode

The routers implement an alternating bypass capability, in which some connections may be

cryptographically authenticated and encrypted while others may not. Two independent internal

actions are required in order to transition into each bypass state: First, the bypass state must be

configured by the Crypto Officer using "match address <ACL-name>" sub-command under

crypto map which defines what traffic is encrypted. Second, the module must receive a packet

that is destined for an IP that is not configured to receive encrypted data. The configuration table

uses an error detection code to detect integrity failures, and if an integrity error is detected, the

module will enter an error state in which no packets are routed. Therefore, a single error in the

configuration table cannot cause plaintext to be transmitted to an IP address for which it should

be encrypted.

2.3.3 Unauthenticated Services

The services available to unauthenticated users are:

Viewing the status output from the module's LEDs

Powering the module on and off using the power switch

Sending packets in bypass

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Define network interfaces and settings, create command aliases, set

the protocols the router will support, enable interfaces and network

services, set system date and time, and load authentication

information.

interface. Each Filter consists of a set of Rules, which define a set

of packets to permit or deny based on characteristics such as

protocol ID, addresses, ports, TCP connection establishment, or

packet direction.

View the router configuration, routing tables, active sessions, use

gets to view SNMP MIB statistics, health, temperature, memory

status, voltage, packet statistics, review accounting logs, and view

physical interface status.

Log off users, shutdown or reload the router, erase the flash

memory, manually back up router configurations, view complete

configurations, manager user rights, and restore router

configurations.

Set up the configuration tables for IP tunneling. Set preshared keys

and algorithms to be used for each IP range or allow plaintext

packets to be set from specified IP address.