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IPv6 NAT-PT Static

Written by Rene Molenaar on . Posted in IPv6

Scenario:

You are working for a large international mining company and responsible for the migration strategy towards IPv6. The ISP has run out of IPv4 addresses and can only supply you with fresh new IPv6 addresses. In order to connect the new "Gold" and "Silver" sites you will need to perform NAT-PT...start digging!

Goal:

  • All IPv4 and IPv6 addresses have been preconfigured for you.
  • All routers have a default route towards router NATPT.
  • Configure NAT-PT and make sure router Platinum is reachable as 2001::C0A8:7B01.
  • Configure NAT-PT and make sure router Bronze is reachable as 2001::C0A8:7B02.
  • Configure NAT-PT and make sure router Gold is reachable as 192.168.123.4.
  • Configure NAT-PT and make sure router Silver is reachable as 192.168.123.5.
  • Your configuration is correct when you have full connectivity.

IOS:

c3725-adventerprisek9-mz.124-15.T7.bin

Topology:

NAT-PT

Video Solution:

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Comments (13)

  • avatar
    asalam
    2011-05-28 23:10:34

    Anybody please share the video config if any body have.

  • avatar
    jefpalma
    2011-06-10 11:01:29

    When I do a ping to the other end the result looks like this:

    Platinum # ping 192.168.45.4

    Type escape sequence to abort.
    Sending 5, 100-byte ICMP Echos to 192.168.45.4, timeout is 2 seconds:
    !.!.!
    Success rate is 60 percent (3 / 5), round-trip min / avg / max = 64/85/108 ms
    # Platinum


    Gold # ping 2001:12:: C0A8: 7B01

    Type escape sequence to abort.
    Sending 5, 100-byte ICMP Echos to 2001:12:: C0A8: 7B01, timeout is 2 seconds:
    !.!.!
    Success rate is 60 percent (3 / 5), round-trip min / avg / max = 60/73/92 ms
    Gold #


    Why?

  • avatar
    ReneMolenaar
    2011-06-19 19:53:21

    To be honest I had the same problem with some of my NAT-PT configs even though the configuration is OK. I tried to look for the answer but couldn't find it.

    If anyone else knows, i'd be delighted to hear it.

    Keep in mind NAT-PT is history as per RFC 4966.

  • avatar
    Ollie
    2011-07-23 15:43:02

    sorry to find a error ... but the .net file is referring to 3725 image not 3640 as on web-page .

  • avatar
    Ollie
    2011-07-24 11:43:35

    I only got packet loss when the eui-64 and global IPv6 addresses were in place at the same time, the .zip has eui-64 on the interfaces.

  • avatar
    ReneMolenaar
    2011-07-25 12:51:36

    Hi Oliver,

    What do you exactly mean? You had 2 IPv6 addresses on the interface or use global addresses with EUI-64?

    Don't be sorry for reporting an error, i'm happy you let me know ;D

    Rene

  • avatar
    Maz
    2011-07-26 07:00:22

    NAT-PT does not work with CEF switching, try didable CEF and you should ping with 100%. This this why NAT-PT is historic per RFC4966.

    Thanks
    Maz Mohamed
    Harris Corp

  • avatar
    ReneMolenaar
    2011-07-26 12:10:51

    Hi Maz,

    Thanks I didn't know CEF was the problem. Even though NAT-PT is historic it's still a CCIE R&S topic ;D

  • avatar
    Maz
    2011-07-28 04:29:10

    Hello Rene,
    Still some users use NAT-PT unforunetly like me, however IETF says its historic, Cisco on ther hand I believe not recommending NAT-PT per one of the decumentaion I came across. NAT64 is the replacement, however it's supported in ASR1000. In may case I have C3800 so I stuck with NAT-PT, and from scalability point of view I'm seeing a numbers of issues, one of them is CEF. What I recomended my customer is to disable fast switching/CEF under interface bases by no ip route-cache command, as I have about only 7 v6 users connected to this router and all 64k bandwidth so not a big deal to disable CEF under those connected interface with low BW. Other issue I had, please check "Multiple IPv6 to connect to single IPv4 server", under Cisco support community discussions.

    Thanks
    Maz

  • avatar
    ReneMolenaar
    2011-07-28 10:35:22

    Hi Maz,

    Thanks for sharing this I didn't know that. I only know about NAT-PT since its a CCIE topic but never tried it on a production network. Are you working often with IPv6? Maybe you have some nice ideas for lab scenarios I can build ;D

    Rene

  • avatar
    Maz
    2011-08-07 02:27:51

    Hi Rene

    Yup, currently working on v6 to/from v4 using NAT-PT, MBGP etc.

  • avatar
    Kevg
    2012-04-02 15:26:05

    Notes:
    1) Check the ipv6 default route on Gold and Silver, mine were incorrect (suspect this may be due to eui-64 on local setup - Rene, maybe these addresses should be fully specified?).
    2) Addresses on GNS3 topology don't match web page and video, be careful if like me you have both screens open!

  • avatar
    ReneMolenaar
    2012-04-04 15:12:57

    Sorry for that, it's misleading ;)