North American Network Operators Group

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RE: Pitfalls of annoucing /24s

  • From: Jean-Christophe Smith
  • Date: Wed Oct 15 17:22:28 2003

I noticed the verio filter policy, in relation to inbound:
 - In the traditional Class A space (i.e., 0/1), we accept /22 and shorter.

If I want to announce a /24 in the 64.x.x.x space(traditional Class A space)
am I'm going to have a problem with other networks that have peer filters
similar to Verios?

Jean-Christophe Smith

-----Original Message-----
From: Phil Rosenthal [mailto:[email protected]] 
Sent: Wednesday, October 15, 2003 1:47 PM
To: John Palmer
Cc: [email protected]
Subject: Re: Pitfalls of annoucing /24s

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

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" <[email protected]>
> To: <[email protected]>
> 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.