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IP adress question

Discussion in 'Networks' started by greenbrucelee, Feb 12, 2008.

  1. greenbrucelee
    Highly Decorated Member Award

    greenbrucelee Zettabyte Poster

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    When I do an ipconfig /all at the command line I get 192.xxx.xxx.x.xx which is what I expect and everything else checks out fine.

    I just ran a couple of the online port scanners and they both gave my ip as being an APIPA address of 172 does anyone have any idea why this occured?
     
    Certifications: A+, N+, MCDST, Security+, 70-270
    WIP: 70-620 or 70-680?
  2. Stoney

    Stoney Megabyte Poster

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    Windows APIPA are 169.254.0.0 to 169.254.255.255 so it's not an APIPA address.

    It could be your public IP. Ipconfig will only show you your private IP unless you have assigned a public IP to the NIC.
     
    Certifications: 25 + 50 metre front crawl
    WIP: MCSA - Exam 70-270
  3. Fergal1982

    Fergal1982 Petabyte Poster

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    Yep, remember that your ADSL modem/router will be performing NAT. The internet doesnt actually see your internal IP. IPConfig shows the IP against the local machine on the internal network.
     
    Certifications: ITIL Foundation; MCTS: Visual Studio Team Foundation Server 2010, Administration
    WIP: None at present
  4. greenbrucelee
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    greenbrucelee Zettabyte Poster

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    oops yeah not APIPA, I have not assigned a public IP, so whats the difference between the public one and private one? I guess other computers/servers see the 172 and the private one is what I send out on is that right?
     
    Certifications: A+, N+, MCDST, Security+, 70-270
    WIP: 70-620 or 70-680?
  5. Stoney

    Stoney Megabyte Poster

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    Public IP is the IP that you are assigned when you use the internet, this IP is usually visible on the internet.

    Private IP is the IP you are assigned when you plug into a a router/firewall and this IP is hidden from the internet.

    Sorry, having my lunch at the mo and can't be arsed to go into more detail!! :biggrin
     
    Certifications: 25 + 50 metre front crawl
    WIP: MCSA - Exam 70-270
  6. greenbrucelee
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    greenbrucelee Zettabyte Poster

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    ahh right got ya both, its ok stoney eat your lunch I got it now.:D
     
    Certifications: A+, N+, MCDST, Security+, 70-270
    WIP: 70-620 or 70-680?
  7. TimoftheC

    TimoftheC Kilobyte Poster

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    Erm, an IP address in the 172.16.0.0 range is a Class B Private address - that help at all :D
     
    Certifications: A+; Network+
    WIP: MCDST???
  8. simongrahamuk
    Honorary Member

    simongrahamuk Hmmmmmmm?

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    Damn, beaten to it! I was just going to say that! :biggrin
     
  9. greenbrucelee
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    greenbrucelee Zettabyte Poster

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    I have still to study about classes. :blink
     
    Certifications: A+, N+, MCDST, Security+, 70-270
    WIP: 70-620 or 70-680?
  10. hbroomhall

    hbroomhall Petabyte Poster Gold Member

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    Note that in the real world of ISPs there are no classes. :biggrin

    And 172.16.0.0 is a /12, not a /16 which is the size of a class B.

    Confused? You will be...

    Harry.
     
    Certifications: ECDL A+ Network+ i-Net+
    WIP: Server+
  11. nXPLOSi

    nXPLOSi Terabyte Poster

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    In my memory serves me correctly, you'll have to know the IP Classes etc for the A+ 8)
     
    Certifications: A+, Network+, Security+, MCSA 2003 (270, 290, 291), MCTS (640, 642), MCSA 2008
    WIP: MCSA 2012
  12. greenbrucelee
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    greenbrucelee Zettabyte Poster

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    Yep I will be :blink

    Yes I know but not to that great extent but its usefull to know
     
    Certifications: A+, N+, MCDST, Security+, 70-270
    WIP: 70-620 or 70-680?
  13. Stoney

    Stoney Megabyte Poster

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    But in the real world you wont use classful IP addressing because it wastes IP addresses. So you'll need to learn Classless InterDomain Routing (CIDR) as well!! :twisted:
     
    Certifications: 25 + 50 metre front crawl
    WIP: MCSA - Exam 70-270
  14. hbroomhall

    hbroomhall Petabyte Poster Gold Member

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    Unless, of course, you come up against the sort of antique that I did last year. I had to work out subnets using the old rules as well!

    That kit is now in the skip.....

    :p

    Harry.
     
    Certifications: ECDL A+ Network+ i-Net+
    WIP: Server+
  15. greenbrucelee
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    greenbrucelee Zettabyte Poster

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    Your screwing with my head :blink

    I only know basic subnetting at the moment, I'll be getting the head screwing stuff after my A+ exams are done
     
    Certifications: A+, N+, MCDST, Security+, 70-270
    WIP: 70-620 or 70-680?
  16. Tinus1959

    Tinus1959 Gigabyte Poster

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    Hey guys, let make him really happy and tell him about VLSM!:twisted:
     
    Certifications: See my signature
    WIP: MCSD, MCAD, CCNA, CCNP
  17. greenbrucelee
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    greenbrucelee Zettabyte Poster

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    noooooooooooooooooooooooooooooooooooooooooooooooo :D:twisted::D
     
    Certifications: A+, N+, MCDST, Security+, 70-270
    WIP: 70-620 or 70-680?

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