North American Network Operators Group
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Blocking Win95 hosts [WAS: Lazy network operators - NOT]
- From: Patrick W.Gilmore
- Date: Mon Apr 19 00:31:22 2004
On Apr 18, 2004, at 11:40 PM, Matt Hess wrote:
<late-night-humor>
I was amused at this and decided to look real quick.. OpenBSD's pf can
block on OS fingerprints.. effectively doing exactly what you are
kidding about (at least I'd hope so.. well, maybe) even in the man
page example they put:
# Do not allow Windows 9x SMTP connections since they are typically
# a viral worm. Alternately we could limit these OSes to 1 connection
each.
block in on $ext_if proto tcp from any os {"Windows 95", "Windows 98"}
\
to any port smtp
The OS fingerprint list they have is rather extensive..
</late-night-humor>
Ya know, I do not think that is such a bad idea.
Does anyone have any stats on the number of "real" MTAs that use Win9x?
Or of the "real" MTAs that show up as Win9x on this fingerprint?
--
TTFN,
patrick
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