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30525 Views 3 Replies Latest reply: Apr 8, 2010 9:18 AM by Patrick Lao RSS

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What is the function of Interface NVI0 in NAT?

Apr 8, 2010 8:36 AM

chemilio 243 posts since
May 31, 2009

Hello everyone,

 

By issuing the command ip nat inside on a fastethernet interface i got this result:

 

*Mar  1 01:09:14.867: %LINEPROTO-5-UPDOWN: Line protocol on Interface NVI0, changed state to up

 

and:

 

router#sh interfaces

 

NVI0 is up, line protocol is up
  Hardware is NVI
  Interface is unnumbered. Using address of FastEthernet0/0 (200.1.1.251)
  MTU 1514 bytes, BW 10000000 Kbit, DLY 0 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation UNKNOWN, loopback not set
  Last input never, output never, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     0 packets input, 0 bytes, 0 no buffer
     Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     0 packets output, 0 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 output buffer failures, 0 output buffers swapped out

 

Just curious, what does this NVIO interface do? It's not really mentioned on the NAT theory. The links i've read so far are a bit vague on the subject.

 

Maybe someone can elaborate more?

 

IOS on the router C3725-ADVENTERPRISEK9-M

 

Thanks,

Chemillio.

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