What is the most standard subnet length on internet

Church, Charles cchurc05 at harris.com
Mon Dec 22 23:40:31 CST 2008


I help a buddy who works for a small ISP.  I believe they're ignoring or
null routing large chunks of APNIC.  Their customers are aware of the
policy, and cool with it.  Port scanning and other malicious stuff
dropped 50% afterwards.


Chuck 

-----Original Message-----
From: Skywing [mailto:Skywing at valhallalegends.com] 
Sent: Monday, December 22, 2008 10:08 PM
To: Valdis.Kletnieks at vt.edu; Nathan Ward
Cc: nanog list
Subject: RE: What is the most standard subnet length on internet


Snarky replies aside, it might be interesting to hear if there are any
real examples of this being done intentionally and not out of not
knowing better or otherwise configuration error.  For example, Tomas
Byrnes's suggestion re: hijacking; although, I suspect that in that
case, he's speaking of someone doing this filtering on a one-off basis
and not on all /24's in the DFZ.

- S

-----Original Message-----
From: Valdis.Kletnieks at vt.edu [mailto:Valdis.Kletnieks at vt.edu] 
Sent: Monday, December 22, 2008 10:05 PM
To: Nathan Ward
Cc: nanog list
Subject: Re: What is the most standard subnet length on internet

On Tue, 23 Dec 2008 14:44:46 +1300, Nathan Ward said:

> Why are people doing this? Are they lacking clue, or, is there some 
> reasonable purpose?

The total number of routing cluons is apparently a fixed quantity.  The
number of AS's is known to be increasing. Do the math.






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