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    SubjectRe: notion of a local address [was: Re: ioctl SIOCGIFNETMASK: ip alias
    Date
    Matthias Andree <matthias.andree@stud.uni-dortmund.de> writes:

    >On Thu, 06 Sep 2001, Alan Cox wrote:

    >> If you accept 10.0.0.1 from the outside you are leaking information. It

    >No, if you accept 10.*.*.* from the outside, your routers are broken.

    BS. This has nothing to do with "accepting connections from addresses":

    % telnet mail.intermeta.de smtp
    Trying 212.34.181.3... <---- Note!
    Connected to mail.intermeta.de.
    Escape character is '^]'.
    220 mail.intermeta.de ESMTP Sendmail 8.11.6/8.11.6; Fri, 7 Sep 2001 11:00:01 +0200
    HELO mail.hometree.net
    250 mail.intermeta.de Hello IDENT:henning@tangens.hometree.net [212.34.181.34], pleased to meet you
    MAIL FROM: <henning@hometree.net>
    250 2.1.0 <henning@hometree.net>... Sender ok
    RCPT TO: <henning@[192.168.2.1]>
    550 5.7.1 <henning@[192.168.2.1]>... Relaying denied
    RCPT TO: <henning@[192.168.2.3]>
    250 2.1.5 <henning@[192.168.2.3]>... Recipient ok
    RCPT TO: <henning@[10.11.12.13]>
    550 5.7.1 <henning@[10.11.12.13]>... Relaying denied
    QUIT

    You may guess now, which the _real_ IP address of "mail.intermeta.de"
    is. Yes, "that other mailer" leaks this information. But only for its
    own, local IP address.

    More "real world" you can't get as in this example. The box transfers
    about 1000 Mails per day which may not be much in todays internet but
    is fine as "my little mail home". Percentage of failed mails because
    of [ip-addr] adressing: 0.00%

    So where lies the problem with all this? If the current reporting of
    the netmasks is a bug: Fine, fix it, get on with life.

    I agree totally with Alan here. If the config can be reported by the
    4.3 API, then it should be and be correct. If it can't: Well tough
    luck for "really, really" portable mailers.

    Regards
    Henning


    --
    Dipl.-Inf. (Univ.) Henning P. Schmiedehausen -- Geschaeftsfuehrer
    INTERMETA - Gesellschaft fuer Mehrwertdienste mbH hps@intermeta.de

    Am Schwabachgrund 22 Fon.: 09131 / 50654-0 info@intermeta.de
    D-91054 Buckenhof Fax.: 09131 / 50654-20
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