IOS Basics, ICMP, & NAT
Chapter 6
Networking Essentials – Eric Vanderburg © 2005
Commands


What can be done in user mode…
Show version – displays info on the IOS &
ROM versions, uptime, image file name...
Global configuration
(configure terminal)


Change the configuration register



Config-register 0x2100
Last digit is t...
CDP (Cisco Discovery
Protocol)
Cdp enable – starts CDP
 No cdp enable – stops CDP
 Cdp timer 60 – sends updates every 60...
Line status
Serial 0 is down, line protocol is down
 First is layer 1, second is layer 2

ICMP codes
! – successful
 . – request timed out
 U – destination unreachable
 & - TTL exceeded




Trace uses the TT...
NAT
(Network Address Translation)
Static – 1 to 1, pre-configured
 Dynamic, limited address space
 Dynamic with overload...
Static NAT commands


Configure terminal


Interface Ethernet 0





Interface Serial 0






ip address 10.1.1.3...
Dynamic NAT commands
<uses prior commands minus the inside
source static lines>
 Access list 1 permit 10.1.1.2
 Access l...
Dynamic NAT with Overload
commands
<uses prior static commands minus the
inside source static lines & access list
from dyn...
NAT commands
Clear ip nat translation – used in
dynamic to reset all translations
 Show ip nat translations – show which
...
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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

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

  1. 1. IOS Basics, ICMP, & NAT Chapter 6 Networking Essentials – Eric Vanderburg © 2005
  2. 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. 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. 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. 5. Line status Serial 0 is down, line protocol is down  First is layer 1, second is layer 2 
  6. 6. ICMP codes ! – successful  . – request timed out  U – destination unreachable  & - TTL exceeded   Trace uses the TTL to track the route
  7. 7. NAT (Network Address Translation) Static – 1 to 1, pre-configured  Dynamic, limited address space  Dynamic with overload, uses PAT, 1 to many 
  8. 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. 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. 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. 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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