What is the most standard subnet length on internet

Nathan Ward nanog at daork.net
Mon Dec 22 19:34:39 CST 2008


On 23/12/2008, at 2:24 PM, Seth Mattinen wrote:
> Nathan Ward wrote:
>> On 23/12/2008, at 1:31 PM, Seth Mattinen wrote:
>>> Anyone running a platform that can't take a full table would apply  
>>> such a filter to weed out anyone who likes to announce all of  
>>> their space as /24's for "traffic engineering". If one does that  
>>> and doesn't announce the aggregate as well, one could find  
>>> themselves facing random black holes.
>> People are filtering /24s without a 0/0 route?
>
> I was just referring to LIR boundaries, but yes, I've seen it happen  
> where someone splits their /22 into only /24s and doesn't announce  
> the covering /22.


Yes, it happens all the time.

Let me rephrase; Are there people who are filtering /24s received from  
eBGP peers who do not have a default route?

I mean the networks who receive those prefixes, not the ones who  
advertise them.

--
Nathan Ward








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