Messages in this thread |  | | From | "Henning P. Schmiedehausen" <> | Subject | Re: notion of a local address [was: Re: ioctl SIOCGIFNETMASK: ip alias | Date | Fri, 7 Sep 2001 09:06:00 +0000 (UTC) |
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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
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