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  1. #1
    Join Date
    Nov 2004
    Location
    FreeBSD 6.2
    Posts
    472

    * Customer using 172.16.253/24 - What?

    I have a consulting customer using 172.16.253/24 as public addresses for their servers.

    I was under the impression 172./8 was IANA reserved space not for public use.

    Am I confused?

    Assuming I am not, what is wrong with this scenario, besides the fact that they _should_ not use that IP space as public ips for their servers?

    Thanks.
    George Donnelly / Systems Administrator
    High Speed Rails inc. / FOSS Hosting
    http://highspeedrails.com
    "Linux is Luke. FreeBSD is Yoda."

  2. #2
    Join Date
    Oct 2004
    Location
    Kerala, India
    Posts
    4,750
    ------
    NetRange: 172.16.0.0 - 172.31.255.255
    CIDR: 172.16.0.0/12
    NetName: IANA-BBLK-RESERVED
    NetHandle: NET-172-16-0-0-1
    Parent: NET-172-0-0-0-0
    NetType: IANA Special Use
    NameServer: BLACKHOLE-1.IANA.ORG
    NameServer: BLACKHOLE-2.IANA.ORG
    Comment: This block is reserved for special purposes.
    Comment: Please see RFC 1918 for additional information.
    ---
    This is what I saw in the whois.
    David | www.cliffsupport.com
    Affordable Server Management Solutions sales AT cliffsupport DOT com
    CliffWebManager | Access WHM from iPhone and Android

  3. #3
    Join Date
    Nov 2005
    Posts
    352
    It's not that they *should not* use that IP space for their public servers, it's that they *can not* use it. All ISPs filter IP traffic for that range (as well as 192.168.0.0/16 and 10.0.0.0/8) at their border routers (and most likely other places inside their networks as well), so traffic originating from or destined to those IPs are dropped as soon as they hit their upstream provider's routers. Are you sure that your client isn't behind a firewall or NAT that is translating those IPs to public IPs?

  4. #4
    Join Date
    Feb 2005
    Location
    I am air u breathe
    Posts
    229
    Yes, that is 100% true, you should not receive any traffic from those range of IP's.

    How are you checking the client's IP ? is it some helpdesk or chat software that gives you this info ?

    Al
    It is reliability that counts...
    Few tips

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