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  1. #1
    Join Date
    Dec 2011
    Posts
    5

    Default p. 667 Figured 13.6 7th Edition

    Perhaps this should have gone under the 7th edition errata thread....I did attempt a search, but didn't find anything. Just wanting to make sure I hadn't missed something implied.

    P. 667 Figure 13.6 shows 2 interfaces on Corp, f0/0 and s0/1, 192.168.76.94 and 192.0.2.29/30, respectively. s0/1 going to the ISP.

    Then it says we're configuring our inside globals at 198.18.41.129-134 and I just can't figure out where this came from...?

    So: ip nat pool Corp 198.18.41.129 198.18.41.134 netmask </29>
    and then ip nat inside source list 1 int s0/0/0 overload

    Assuming we're talking about figure 13.6, it should be:
    ip nat pool Corp 192.0.2.29 192.0.2.29 netmask 255.255.255.252
    and
    ip nat inside source list 1 int s0/1 overload

    Is this correct?

  2. #2
    Join Date
    Aug 2011
    Location
    Plano, TX
    Posts
    92

    Default

    The link between Corp and ISP is a point-to-point link and doesn't participate in NAT and is mostly a red herring in this example. What's not shown (but has to be assumed) is that there is a route on ISP for 198.18.41.128/29 to s0/1. This is the block of Internet addresses assigned to Corp by the ISP.

    Internally, the LAN that Corp's f0/0 interface is connected to is 192.168.76.64/27, so we want to NAT these local addresses into the block of public Internet addresses assigned to Corp by the ISP, and that is what the commands on pg. 668 do.
    Last edited by bobdempsey; 04-02-2013 at 11:22 AM.
    Bob Dempsey
    CCNA

  3. #3
    Join Date
    Dec 2011
    Posts
    5

    Default Cool

    Thank you, sir! I must admit to still wishing I wasn't having to assume a random network was just not shown in the figure, but it makes sense.

    Thanks again!

  4. #4
    Join Date
    Jan 2013
    Posts
    1

    Default Nat ex page 667

    IN THE SAME EXAMPLE IF THIS NAT OVERLOAD SO MUST BE THE IP ADDRESS IS ip nat pool corp 198.18.41.129 198.18.41.129 because this is PAT ISN'T IT ?

  5. #5
    Join Date
    Aug 2012
    Posts
    33

    Default

    Folks for the record, this could have been a lot better laid out. "implied" should be stated in the text, or failing that the diagrams could be better.

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