防火墙入侵于检测——————4、思科安全设备

用户接口

防火墙访问模式
思科防火墙有4个安全管理访问模式:

•Unprivileged

•Privileged

•Configuration

•Monitor 

AccessPrivilege Mode

访问配置模式:configure terminal 命令

help 命令

文件管理

查看和保存你的配置

ClearingRunning Configuration

ClearingStartup Configuration

Reloadthe Configuration: reload Command

FileSystem

DisplayingStored Files: System and Configuration

SelectingBoot System File

Verifyingthe Startup System Image

Security Appliance Security Levels

Functionsof the Security Appliance: Security Algorithm

•Implements stateful connection control through the securityappliance.

•Allows one-way (outbound) connectionswith a minimum number of configuration changes. An outbound connection is aconnection originating from a host on a more-protected interface and destinedfor a host on a less-protected network.

•Monitors return packets to ensure thatthey are valid.

•Randomizes the first TCP sequence numberto minimize the risk of attack.

SecurityLevel Example

Basic Security ApplianceConfiguration

AssigningHostname to Security Appliance: Changing the CLI Prompt

BasicCLI Commands for Security Appliances 

interface Command and Subcommands

Assignan Interface Name:nameifSubcommand

AssignInterface IP Address: ipaddress Subcommand

DHCP-AssignedAddress

Assigna Security Level: security-level SubCommands

Assignan Interface Speed and Duplex: speed and duplex SubCommands

ASAManagement Interface

NetworkAddress Translation 

EnableNAT Control 

nat Command

nat 0

nat 0 命令：
防火墙不对通过它的数据包进行地址转换。 

pixfirewall(conifg)#nat(inside) 1 10.0.0.0 255.0.0.0
pixfirewall(conifg)#nat (inside) 0 192.168.0.0 255.255.255.0

global Command

Configurea Static Route: route Command

HostName-to-IP-AddressMapping: name Command

ConfigurationExample

ConfigurationExample (Cont.)

ConfigurationExample (Cont.)

ExaminingSecurity Appliance Status

show Commands

show memory Command

show cpu usage Command

show version Command

show ip address Command

show interface Command

show nameifCommand

show run natCommand

show run global Command

show xlateCommand

ping Command

show route Command

Setting Time and Using NTP Support

clock Command

SettingDaylight Saving Time and Time Zones

ntp Command

Summary

Summary(Cont.)

LabVisual Objective

参考：CISCO