nanog mailing list archives
RE: Pitfalls of annoucing /24s
From: "H. Michael Smith, Jr." <michael () awtechnologies com>
Date: Wed, 15 Oct 2003 18:05:01 -0400
Understood. But... networks filtering out the /24 announcement will always prefer the aggregate learned from the owner/issuer of the space. They'll be completely unaware that another route exists to the (/24) network. If the customers link to the provider that assigned the space goes down, those filtering /24's will still send the traffic to the 'owner' of the space (right?). What is the issuer of the /24 is filtering incoming /24 advertisements (Verio)? Will they learn the route to the other ISP or blackhole traffic destined for their own customer? I keep hoping that I am missing something here. If not, I sure hope more folks don't adopt Verio's filtering techniques. (I know that a VERY low AS # issues /24's out of a /8) -----Original Message----- From: Phil Rosenthal [mailto:pr () isprime com] Sent: Wednesday, October 15, 2003 5:42 PM To: H. Michael Smith, Jr. Cc: nanog () merit edu; 'John Palmer' Subject: Re: Pitfalls of annoucing /24s On Oct 15, 2003, at 5:24 PM, H. Michael Smith, Jr. wrote:
What about the /24's that many ISPs (especially tier 2-3) are
assigning
to multi-homed customers? What about an IX or "critical
infrastructure
providers" that may be issued a /24 from ARIN (Policy 2001-3)?
As long as it's provider assigned, and your provider announces the supernet that the /24 is from, it will still work. If you announce PI space out of the old class A space in /24's, many networks wont be able to reach you.
Current thread:
- Re: Pitfalls of annoucing /24s, (continued)
- Re: Pitfalls of annoucing /24s Andrew - Supernews (Oct 15)
- Re: Pitfalls of annoucing /24s Sean Donelan (Oct 15)
- RE: Pitfalls of annoucing /24s Jean-Christophe Smith (Oct 15)
- RE: Pitfalls of annoucing /24s william (Oct 15)
- RE: Pitfalls of annoucing /24s William Caban (Oct 15)
- RE: Pitfalls of annoucing /24s H. Michael Smith, Jr. (Oct 15)
- Re: Pitfalls of annoucing /24s Phil Rosenthal (Oct 15)
- Re: Pitfalls of annoucing /24s Andy Ellifson (Oct 15)
- Re: Pitfalls of annoucing /24s K. Scott Bethke (Oct 15)
- Re: Pitfalls of annoucing /24s Phil Rosenthal (Oct 15)
- RE: Pitfalls of annoucing /24s Forrest (Oct 15)
- RE: Pitfalls of annoucing /24s H. Michael Smith, Jr. (Oct 15)
- RE: Pitfalls of annoucing /24s H. Michael Smith, Jr. (Oct 15)
- RE: Pitfalls of annoucing /24s Forrest (Oct 15)
- Re: Pitfalls of annoucing /24s Marshall Eubanks (Oct 18)
- Pitfalls of _accepting_ /24s jlewis (Oct 18)
- RE: Pitfalls of _accepting_ /24s Terry Baranski (Oct 18)
- RE: Pitfalls of _accepting_ /24s Howard C. Berkowitz (Oct 18)
- Re: Pitfalls of annoucing /24s Marshall Eubanks (Oct 18)
- Re: Pitfalls of annoucing /24s Brian Bruns (Oct 18)