Cisco useful feature and commands

configure DHCP server on Cisco Router:
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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

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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 identify IPtraffic that fails IP access lists and with the number of transit records thatwill be stored in the IP accounting database limited to 100:

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

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Copy flash的内容到tftp中：

archive tar /create tftp:1.2.3.4/saved.tar flash:

https://learningnetwork.cisco.com/thread/10762

Copy tftp to flash:

archive tar /xtract tftp://192.168.3.250/c1200-k9w7-tar.123-8.JA2.tar flash: