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分析一條Cisco路由器的安全命令

2019-11-05 01:01:01
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  前兩天在路由器試用了一個(gè)命令:auto secure,這個(gè)命令用起來(lái)比較方便,而且可以關(guān)閉一些不安全的服務(wù)和啟用一些安全的服務(wù)。然后對(duì)這個(gè)命令做了一個(gè)總結(jié)。(注:似乎ios版本為:12.3(1)以上才支持使用)

  總結(jié)如下:

  1、關(guān)閉一些全局的不安全服務(wù)如下:

  Finger

  PAD

  Small Servers

  Bootp

  HTTP service

  Identification Service

  CDP

  NTP

  Source Routing

  2、開(kāi)啟一些全局的安全服務(wù)如下:

  PassWord-encryption service

  Tuning of scheduler interval/allocation

  TCP synwait-time

  TCP-keepalives-in and tcp-kepalives-out

  SPD configuration

  No ip unreachables for null 0

  3、關(guān)閉接口的一些不安全服務(wù)如下:

  ICMP

  PRoxy-Arp

  Directed Broadcast

  Disables MOP service

  Disables icmp unreachables

  Disables icmp mask reply messages.

  4、提供日志安全如下:

  Enables sequence numbers & timestamp

  Provides a console log

  Sets log buffered size

  Provides an interactive dialogue to configure the logging server ip address.

  5、保護(hù)訪問(wèn)路由器如下:

  Checks for a banner and provides facility to add text to automatically configure:

  Login and password

  Transport input & output

  Exec-timeout

  Local AAA

  SSH timeout and ssh authentication-retries to minimum number

  Enable only SSH and SCP for access and file transfer to/from the router

  6、保護(hù)轉(zhuǎn)發(fā)Forwarding Plane

  Enables Cisco EXPress Forwarding (CEF) or distributed CEF on the router, when available

  Anti-spoofing

  Blocks all IANA reserved IP address blocks

  Blocks private address blocks if customer desires

  Installs a default route to NULL 0, if a default route is not being used

  Configures TCP intercept for connection-timeout, if TCP intercept feature is available and the user is interested

  Starts interactive configuration for CBAC on interfaces facing the Internet, when using a Cisco IOS Firewall image,

  Enables NetFlow on software forwarding platforms



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