nanog mailing list archives
Re: BCP38 is hard, was TWC (AS11351) blocking all NTP?
From: Chuck Anderson <cra () WPI EDU>
Date: Tue, 4 Feb 2014 17:36:18 -0500
On Tue, Feb 04, 2014 at 10:18:21PM -0000, John Levine wrote:
I was at a conference with people from some Very Large ISPs. They told me that many of their large customers absolutely will not let them do BCP38 filtering. ("If you don't want our business, we can find someone else who does.") The usual problem is that they have PA space from two providers and for various reasons, not all of which are stupid, traffic with provider A's addresses sometimes goes out through provider B. Adding to the excitement, some of these customers are medium sized ISPs with multihomed customers of their own. I don't know BGP well enough to know if it's possible to send out announcements for this situtation, this address range is us, but don't route traffic to it. Even if it is, not all of the customers do BGP, some are just stub networks. If we could figure out a reasonable way (i.e., one that the customers might be willing to implement) to handle this, it'll make BCP38 a lot more doable.
No-Advertise or No-Export community?
Current thread:
- Re: TWC (AS11351) blocking all NTP?, (continued)
- Re: TWC (AS11351) blocking all NTP? Jared Mauch (Feb 04)
- Re: TWC (AS11351) blocking all NTP? Jay Ashworth (Feb 04)
- Re: TWC (AS11351) blocking all NTP? Michael Smith (Feb 06)
- Re: TWC (AS11351) blocking all NTP? Doug Barton (Feb 04)
- Re: TWC (AS11351) blocking all NTP? William Herrin (Feb 04)
- Re: TWC (AS11351) blocking all NTP? Christopher Morrow (Feb 04)
- Re: TWC (AS11351) blocking all NTP? Majdi S. Abbas (Feb 04)
- Re: TWC (AS11351) blocking all NTP? William Herrin (Feb 04)
- Re: BCP38 is hard, was TWC (AS11351) blocking all NTP? John Levine (Feb 04)
- Re: BCP38 is hard, was TWC (AS11351) blocking all NTP? Paul Ferguson (Feb 04)
- Re: BCP38 is hard, was TWC (AS11351) blocking all NTP? Chuck Anderson (Feb 04)
- Re: BCP38 is hard, was TWC (AS11351) blocking all NTP? William Herrin (Feb 04)
- Re: BCP38 is hard, was TWC (AS11351) blocking all NTP? Octavio Alvarez (Feb 04)
- Re: BCP38 is hard, was TWC (AS11351) blocking all NTP? John R. Levine (Feb 04)
- Re: BCP38 is hard, was TWC (AS11351) blocking all NTP? William Herrin (Feb 04)
- Re: BCP38 is hard, was TWC (AS11351) blocking all NTP? John Levine (Feb 04)
- Re: BCP38 is hard, was TWC (AS11351) blocking all NTP? Mark Andrews (Feb 04)
- Re: BCP38 is hard, was TWC (AS11351) blocking all NTP? Randy Bush (Feb 04)
- Re: BCP38 is hard, was TWC (AS11351) blocking all NTP? Jay Ashworth (Feb 04)
- Re: BCP38 is hard, was TWC (AS11351) blocking all NTP? Saku Ytti (Feb 05)
- Re: BCP38 is hard, was TWC (AS11351) blocking all NTP? Jared Mauch (Feb 05)