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Re: [PLUG] Spam Elimination
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On Thu, Jan 20, 2005 at 11:43:15AM -0500, Doug Crompton wrote:
> On the same topic... can anyone explain what IANA is/does?
One of the roles of The Internet Assigned Number Authority (IANA) is to
allocate address space to regional authorities, such as ARIN.
> They have the 46 address block but I cannot seem to find assignment
> lookup (whois) for it. Their website shows (outdated) assignments for
> the 46 block.
The 46/8 block is unallocated, and appears to be unused; there are no BGP
announcements (the protocol by which multi-homed network service providers
know how to reach other network service providers) for it, or for any more
specific prefixes in that /8. It's possible someone was announcing it
momentarily in order to SPAM from it for a short-time, which has been
known to happen in the past, and is possible if for example the upstream
provider of a BGP-speaking customer doesn't filter properly.
> In any event I got a spam from an address in the 46 block and was
> wondering where it really came from.
Full headers?
-mct
--
perl -e'$u="\4\5\6";sub H{8*($_[1]%79)+($_[0]%8)}sub G{vec$u,H(@_),1}sub S{vec
($n,H(@_),1)=$_[2]}$_=q^{P`clear`;for$iX){PG($iY)?"O":" "forX8);P"\n"}for$iX){
forX8){$c=scalar grep{G@$_}[$i-1Y-1Z-1YZ-1Y+1ZY-1ZY+1Z+1Y-1Z+1YZ+1Y+1];S$iY,G(
$iY)?$c=~/[23]/?1:0:$c==3?1:0}}$u=$n;select$M,$C,$T,.2;redo}^;s/Z/],[\$i/g;s/Y
/,\$_/xg;s/X/(0..7/g;s/P/print+/g;eval' # Michael C. Toren <mct@toren.net>
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