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CCNA Routing and Switching Lesson 06 - IOS Basics - Eric Vanderburg
CCNA Routing and Switching Lesson 06 - IOS Basics - Eric Vanderburg
CCNA Routing and Switching Lesson 06 - IOS Basics - Eric Vanderburg
CCNA Routing and Switching Lesson 06 - IOS Basics - Eric Vanderburg
CCNA Routing and Switching Lesson 06 - IOS Basics - Eric Vanderburg
CCNA Routing and Switching Lesson 06 - IOS Basics - Eric Vanderburg
CCNA Routing and Switching Lesson 06 - IOS Basics - Eric Vanderburg
CCNA Routing and Switching Lesson 06 - IOS Basics - Eric Vanderburg
CCNA Routing and Switching Lesson 06 - IOS Basics - Eric Vanderburg
CCNA Routing and Switching Lesson 06 - IOS Basics - Eric Vanderburg
CCNA Routing and Switching Lesson 06 - IOS Basics - Eric Vanderburg
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CCNA Routing and Switching Lesson 06 - IOS Basics - Eric Vanderburg

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CCNA Routing and Switching Lesson 06 - IOS Basics - Eric Vanderburg

CCNA Routing and Switching Lesson 06 - IOS Basics - Eric Vanderburg

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  • 1. IOS Basics, ICMP, & NAT Chapter 6 Networking Essentials – Eric Vanderburg © 2005
  • 2. Commands  What can be done in user mode… Show version – displays info on the IOS & ROM versions, uptime, image file name, & hardware specs.  Enable  Show running-config 
  • 3. Global configuration (configure terminal)  Change the configuration register   Config-register 0x2100 Last digit is the boot mode      View what is in flash – show flash Add boot system commands   0 – ROM Monitor 1 – RXBoot mode 2 – look in NVRAM for commands & load IOS from flash Boot system flash cisco-g-1.2315-9 Show ip route
  • 4. CDP (Cisco Discovery Protocol) Cdp enable – starts CDP  No cdp enable – stops CDP  Cdp timer 60 – sends updates every 60 seconds  Cdp holdime 100 – keeps cdp info in ram for 100 seconds 
  • 5. Line status Serial 0 is down, line protocol is down  First is layer 1, second is layer 2 
  • 6. ICMP codes ! – successful  . – request timed out  U – destination unreachable  & - TTL exceeded   Trace uses the TTL to track the route
  • 7. NAT (Network Address Translation) Static – 1 to 1, pre-configured  Dynamic, limited address space  Dynamic with overload, uses PAT, 1 to many 
  • 8. Static NAT commands  Configure terminal  Interface Ethernet 0    Interface Serial 0     ip address 10.1.1.3 255.255.255.0 Ip nat inside Ip address 200.1.1.251 255.255.255.0 Ip nat outside Ip nat inside source static 10.1.1.2 200.1.1.2 Ip nat inside source static 10.1.1.1 200.1.1.1
  • 9. Dynamic NAT commands <uses prior commands minus the inside source static lines>  Access list 1 permit 10.1.1.2  Access list 1 permit 10.1.1.1  Ip nat pool Test 200.1.1.1 200.1.1.2 netmask 255.255.255.252  Ip nat inside source list 1 pool Test 
  • 10. Dynamic NAT with Overload commands <uses prior static commands minus the inside source static lines & access list from dynamic>  Ip nat inside source list 1 interface Serial 0 overload 
  • 11. NAT commands Clear ip nat translation – used in dynamic to reset all translations  Show ip nat translations – show which internal addresses & ports are mapped to which external addresses & ports  Debug ip nat – shows each time an address is translated 

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