Cisco useful feature and commands

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　　configure DHCP server on Cisco Router:
　　---------------------------------------
　　ip dhcp excluded-address 192.168.27.1 192.168.27.50
　　!
　　ip dhcp pool cisco
　　network 192.168.27.0 255.255.255.0
　　dns-server 192.168.7.20
　　domain-name fagorarrasate.net
　　default-router 192.168.27.1
　　configure HTTP server:
　　---------------------
　　ip http server
　　username cisco privilege 15 password cisco
　　ip http authentication local
　　ip http secure-server
　　ip http timeout-policy idle 60 life 86400 requests 10000
　　configure local logon without username and password/ with username and password:
　　-------------------------------
　　line con 0
　　exec-timeout 0 0
　　login local
　　line vty 0 4
　　password cisco
　　login
　　transport input all
　　Crack username/password for Cisco router:
　　-------------------------
　　after router boot up, in 10s, press FN+Ctrl+B or Ctrl+Break
　　then, confreg 0x2142
　　reset
　　----------
　　en
　　copy start-confi running
　　config-register 0x2102
　　no enable pass
　　no enable secret
　　exit
　　wr
　　--------------
　　IPAccounting  archive router configuration
　　archive router ：
　　http://www.packetu.com/2013/05/07/how-to-automate-cisco-backup-using-configuration-archive/
　　archive
　　path tftp://10.254.254.10/router/
　　write-memory
　　no file verify auto
　　int g2/0
　　ip accounting output-packets
　　exit
　　sh ip accounting
　　int g2/0
　　no ip accounting
　　exit
　　clear ip accounting
　　http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipapp/configuration/15-s/iap-15-s-book/iap-ipserv.html
　　Router# configureterminal
　　Router(config)#interface ethernet 0/5
　　Router(config-if)#ip accounting mac-address input
　　Router(config-if)#ip accounting mac-address output
　　Router(config-if)#ip accounting precedence input
　　Router(config-if)#ip accounting precedence output

　　The followingexample shows how to enable IP accounting with the ability to>　　Router# configureterminal
　　Router(config)# ipaccounting-transits 100
　　Router(config)#interface ethernet 0/5
　　Router(config-if)#ip accounting output-packets
　　Router(config-if)#ip accounting access-violations
　　---------------
　　Copy flash的内容到tftp中：
archivetar /create tftp:1.2.3.4/saved.tar flash:
https://learningnetwork.cisco.com/thread/10762

　　Copy tftp to flash:
archivetar /xtract tftp://192.168.3.250/c1200-k9w7-tar.123-8.JA2.tar flash: