nanog mailing list archives
Re: Thank you, Comcast.
From: Damian Menscher via NANOG <nanog () nanog org>
Date: Fri, 26 Feb 2016 08:02:52 -0800
On Fri, Feb 26, 2016 at 6:28 AM, Jared Mauch <jared () puck nether net> wrote:
As a community we need to determine if this background radiation and these responses are proper. I think it's a good response since vendors can't do uRPF at line rate and the major purchasers of BCM switches don't ask for it and aren't doing it, so it's not optimized or does not exist. /sigh
I don't agree with the approach of going after individual reflectors (open*project) or blocking specific ports (Comcast's action here) as both are reactive, unlikely to be particularly effective (there are still millions of reflectors and plenty of open ports available), and don't solve the root problem (spoofed packets making it onto the public internet). What I'd much rather see Comcast do is use their netflow to trace the source of the spoofed packets (one of their peers or transit providers, no doubt) and strongly encourage (using their legal or PR team as needed) them to trace back and stop the spoofing. This benefits everyone in a much more direct and scalable way. Until some of the larger providers start doing that, amplification attacks and other spoofed-source attacks (DNS and synfloods) will continue to thrive. (I've contacted several ISPs about the spoofed traffic they send to us. The next major hurdle is that so many don't have netflow or other useful monitoring of their networks....) Damian
Current thread:
- Re: Thank you, Comcast., (continued)
- Re: Thank you, Comcast. Chris Adams (Feb 26)
- Re: Thank you, Comcast. Dovid Bender (Feb 26)
- Re: Thank you, Comcast. Rich Kulawiec (Feb 26)
- Re: Thank you, Comcast. Brielle Bruns (Feb 26)
- Re: Thank you, Comcast. Anthony Junk (Feb 26)
- Re: Thank you, Comcast. Roland Dobbins (Feb 26)
- Re: Thank you, Comcast. Roland Dobbins (Feb 26)
- Re: Thank you, Comcast. Mikael Abrahamsson (Feb 26)
- Re: Thank you, Comcast. Maxwell Cole (Feb 26)
- Re: Thank you, Comcast. Jared Mauch (Feb 26)
- Re: Thank you, Comcast. Damian Menscher via NANOG (Feb 26)
- Re: Thank you, Comcast. Roland Dobbins (Feb 26)
- Re: Thank you, Comcast. Dovid Bender (Feb 26)
- Re: Thank you, Comcast. Jared Mauch (Feb 26)
- Re: Thank you, Comcast. Damian Menscher via NANOG (Feb 26)
- Re: Thank you, Comcast. Dovid Bender (Feb 26)
- Re[2]: Thank you, Comcast. Adam (Feb 26)
- RE: Thank you, Comcast. Keith Medcalf (Feb 26)
- Re: Thank you, Comcast. Livingood, Jason (Feb 26)
- RE: Thank you, Comcast. Keith Medcalf (Feb 26)
- Re: Thank you, Comcast. Mike Hammett (Feb 26)