nanog mailing list archives
Re: Who is announcing bogons?
From: Henry Kilmer <hank () rem com>
Date: Wed, 30 Apr 2003 18:16:13 -0400
babylon () egenius org writes:
Why do we expect the same ISP engineers to be better at configuring negative lists or keeping them up to date? According to Craig Labovitz's study published at Microsoft http://www.research.microsoft.com/research/pubs/view.aspx?msr_tr_id=MSR-TR-2000-74 100% of the ISP's surveyed filter inbound customer route announcements.Ahhh, but that was not the correct question to ask (I have not read the study). It is not whether ISP's filter inbound customer route announcements. It is how they filter them. If the customer goes and says I am going to announce 4.0.0.0/8 and the ISP just blindly adds that to the filter, we have a problem, but the ISP did answer that question truthfully. They are filtering.
Many ISPs use AS path filters for customers with a large number of announcements. Some implement netblock filters that are not exact matches. Both of these are examples where the ISP would honestly say they filter but holes exist. -Hank
Current thread:
- Re: Get as much IP space as you ever dreamed of, was: Re: Looking to buy IPv4 addresses from class C swamp, (continued)
- Re: Get as much IP space as you ever dreamed of, was: Re: Looking to buy IPv4 addresses from class C swamp Jack Bates (Apr 28)
- Re: Get as much IP space as you ever dreamed of, was: Re: Looking to buy IPv4 addresses from class C swamp Rob Thomas (Apr 28)
- Who is announcing bogons? Sean Donelan (Apr 28)
- Re: Who is announcing bogons? Rob Thomas (Apr 28)
- Re: Who is announcing bogons? Richard Cox (Apr 28)
- Re: Who is announcing bogons? Rob Thomas (Apr 28)
- Re: Who is announcing bogons? Sean Donelan (Apr 28)
- Re: Who is announcing bogons? Rob Thomas (Apr 28)
- Re: Who is announcing bogons? babylon (Apr 28)
- RE: Who is announcing bogons? David Luyer (Apr 29)
- Re: Who is announcing bogons? Henry Kilmer (Apr 30)
- Re: Get as much IP space as you ever dreamed of, was: Re: Looking to buy IPv4 addresses from class C swamp Jack Bates (Apr 28)
- Re: Who is announcing bogons? Jack Bates (Apr 28)
- Re: Who is announcing bogons? Paul Vixie (Apr 28)
- Re: Who is announcing bogons? Margie (Apr 28)
- Re: Who is announcing bogons? Sean Donelan (Apr 29)
- The in-your-face hijacking example, was: Re: Who is announcing bogons? kai (Apr 29)
- Re: The in-your-face hijacking example, was: Re: Who is announcing bogons? Sean Donelan (Apr 29)
- Re: The in-your-face hijacking example, was: Re: Who is announcing bogons? Jack Bates (Apr 29)
- Re: The in-your-face hijacking example, was: Re: Who is announcing bogons? Richard A Steenbergen (Apr 29)
- Re: The in-your-face hijacking example, was: Re: Who is announcing bogons? Alex Rubenstein (Apr 29)
- Re: The in-your-face hijacking example, was: Re: Who is announcing bogons? Christopher L. Morrow (Apr 29)