Pitfalls of annoucing /24s

Phil Rosenthal pr at isprime.com
Wed Oct 15 20:46:50 UTC 2003


http://info.us.bb.verio.net/routing.html#PeerFilter

That's how Verio does it, and I assume, that's how most people who 
filter by length do it as well.

--Phil
On Oct 15, 2003, at 4:40 PM, John Palmer wrote:

>
> Good question.
>
> You know there are thousands of legacy /24's out there that were 
> allocated by
> IANA as /24's How can you aggregate them up if all you have is the /24?
>
> To those who filter out /24's - how is this done - just by the netmask 
> size?
>
> ----- Original Message -----
> From: "Jean-Christophe Smith" <jsmith at vitalstream.com>
> To: <nanog at merit.edu>
> Sent: Wednesday, October 15, 2003 15:34
> Subject: Pitfalls of annoucing /24s
>
>
>>
>>
>> In current practice would there be serious jeopardy of portions of the
>> internet not being able to reach this address space due to bgp 
>> filters or
>> other restrictions? What is the smallest acceptable block of IPs that 
>> can be
>> announced without adverse or unpredictable results? Verio would most 
>> likely
>> be picking up these routes from us. I don't want to cause a religious
>> debate, but I am interested in what the industry consensus is.
>>
>> I'm just doing some research, any comments would be appreciated.
>>
>> Thanks,
>> Jean-Christophe Smith
>>
>>
>
>
--Phil Rosenthal
ISPrime, Inc.




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