Configuring IPS Using the Cisco IOS CLI
  
  Prepare the Router and TFTP Server 
   Verify the availability of Cisco IOS IPS files
   Verify or create the IPS directory in router flash
    R1# show flash 
    R1# mkdir ipsdir 
    R1# delete flash:ipsdir/*
    R1# dir flash: 
    R1# dir flash:ipsdir 
  Configure the IPS Crypto Key
   Copy and paste the crypto key file into R1
   Apply the contents of the text file to the router. 
    R1(config)# crypto key pubkey-chain rsa 
    R1(config-pubkey-chain)# named-key realm-cisco.pub signature 
    R1(config-pubkey-key)# key-string
    
    R1(config-pubkey)#$2A864886 F70D0101 01050003 82010F00 3082010A 02820101      
    R1(config-pubkey)#$D6CC7A24 5097A975 206BE3A2 06FBA13F 6F12CB5B 4E441F16      
    R1(config-pubkey)#$912BE27F 37FDD9C8 11FC7AF7 DCDD81D9 43CDABC3 6007D128      
    R1(config-pubkey)#$085FADC1 359C189E F30AF10A C0EFB624 7E0764BF 3E53053E      
    R1(config-pubkey)#$0298AF03 DED7A5B8 9479039D 20F30663 9AC64B93 C0112A35      
    R1(config-pubkey)#$994AE74C FA9E481D F65875D6 85EAF974 6D9CC8E3 F0B08B85      
    R1(config-pubkey)#$5E4189FF CC189CB9 69C46F9C A84DFBA5 7A0AF99E AD768C36      
    R1(config-pubkey)#$A3B3FB1F 9FB7B3CB 5539E1D1 9693CCBB 551F78D2 892356AE      
    R1(config-pubkey)#$80CA4F4D 87BFCA3B BFF668E9 689782A5 CF31CB6E B4B094D3      
    R1(config-pubkey)#   F3020301 0001 
    R1(config-pubkey)#  quit 
  
  Configure IPS 
   Create an IPS rule
    R1(config)# ip ips name iosips 
    
   Configure the IPS Signature storage location in router flash memory.
     R1(config)# ip ips config location flash:ipsdir
   Enable IPS SDEE event notification 
     R1(config)# ip http server 
     R1(config)# ip ips notify sdee 
   
   Enable IPS syslog support
     R1(config)# ip ips notify log
     R1# clock set 01:20:00 8 march 2015
     R1(config)# service timestamps log datetime msec
     R1(config)# logging 192.168.1.3
   
   
    Configure IOS IPS to use one of the pre-defined signature categories. 
     R1(config)# ip ips signature-category 
     R1(config-ips-category)# category all 
     R1(config-ips-category-action)# retired true 
     R1(config-ips-category-action)# exit 
     R1(config-ips-category)# category ios_ips basic 
     R1(config-ips-category-action)# retired false 
     R1(config-ips-category-action)# exit
     Do you want to accept these changes? [confirm] <Enter>
    
    Apply the IPS rule to an interface
      R1(config)# interface serial0/0/0 
      R1(config-if)# ip ips iosips in 
      
      R1(config)# interface g0/1 
      R1(config-if)# ip ips iosips in
    
    
    
    Load the IOS IPS Signature Package to the Router 
    Download the TFTP server
    Start the TFTP server on PC-A and verify the IPS file directory
     Copy the signature package from the TFTP server to the router
       # copy tftp://192.168.1.3/IOS-S855-CLI.pkg idconf
       R1# dir flash:ipsdir 
       R1# dir usbflash0:
       R1# show ip ips signature count 
       R1# show ip ips all
    
    Modify the signature
      R1(config)# ip ips signature-definition 
      R1(config-sigdef)# signature 2004 0 
      R1(config-sigdef-sig)#status 
      R1(config-sigdef-sig-status)# retired false 
      R1(config-sigdef-sig-status)# enabled true 
      R1(config-sigdef-sig-status)# engine 
      R1(config-sigdef-sig-engine)# event-action produce-alert 
      R1(config-sigdef-sig-engine)# event-action deny-packet-inline 
      R1(config-sigdef-sig-engine)# event-action reset-tcp-connection 
      R1(config-sigdef-sig-engine)# exit 
      R1(config-sigdef-sig)# exit
    
    Simulate an Attack 
      nmap -T4 -A -v 10.1.1.2
    
    Observe the syslog messages on R1