nanog mailing list archives
Re: Howto for BGP black holing/null routing
From: Jeff Wheeler <jsw () inconcepts biz>
Date: Wed, 23 Feb 2011 10:36:51 -0500
On Tue, Feb 22, 2011 at 4:55 PM, Jack Carrozzo <jack () crepinc com> wrote:
Maybe I read your question wrong, but null-routing things at your border is often not very useful if the traffic is flooding your transit links. Most transits publish their community lists - you just need to tag the prefix you want to blackhole with the right community.
This is certainly true. Although most "big transit networks" offer this feature today, there are some important differences in what some of them will and won't accept. Some will only learn /32s, some say they'll accept /30-/32 but nothing shorter, some will honor anything you send them. This may be undocumented. Some networks seem to have forgotten about this feature when implementing IPv6, even though it is offered for IPv4. I don't see any value in not accepting a RTBH /24 but accepting a /30. I also don't know of any platform issues which would make deploying RTBH for IPv6 BGP customers any more difficult than doing so for IPv4. -- Jeff S Wheeler <jsw () inconcepts biz> Sr Network Operator / Innovative Network Concepts
Current thread:
- Howto for BGP black holing/null routing David Hubbard (Feb 22)
- Re: Howto for BGP black holing/null routing Łukasz Bromirski (Feb 22)
- Re: Howto for BGP black holing/null routing Jared Mauch (Feb 22)
- Re: Howto for BGP black holing/null routing Christopher Morrow (Feb 22)
- Re: Howto for BGP black holing/null routing Jared Mauch (Feb 22)
- Re: Howto for BGP black holing/null routing Jack Carrozzo (Feb 22)
- Re: Howto for BGP black holing/null routing Jeff Wheeler (Feb 23)
- Re: Howto for BGP black holing/null routing Dobbins, Roland (Feb 22)
- Re: Howto for BGP black holing/null routing Owen DeLong (Feb 22)
- Re: Howto for BGP black holing/null routing Jon Lewis (Feb 22)
- Re: Howto for BGP black holing/null routing Randy McAnally (Feb 23)
- Re: Howto for BGP black holing/null routing Rafael Rodriguez (Feb 23)
- Re: Howto for BGP black holing/null routing Joel Jaeggli (Feb 23)
- Re: Howto for BGP black holing/null routing Łukasz Bromirski (Feb 22)