Content Delivery Networks

Patrick W. Gilmore patrick at
Fri Aug 10 18:55:02 UTC 2007

On Aug 10, 2007, at 12:46 PM, John Levine wrote:

>> Very interesting.  We've all heard and probably all passed along  
>> that little
>> bromide at one time or another.  Is it possible that at one time  
>> it was true
>> (even possibly for AOL) but with the rise of CDNs, policies of not  
>> honoring
>> TTL's have fallen by the wayside?
> I think you'll still see it in spam zombies, some of which have the  
> DNS info
> pre-loaded into them in order to avoid split-horizon anti-spam  
> techniques.
> Not much we can do about that until we get sufficient backbone to deal
> with the zombie problem and its software enablers.

Actually, I think the fact Zombies do not honor TTLs is a feature. :)


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