nanog mailing list archives
Re: Confirming source-routed multicast is dead on the public Internet
From: Steve Meuse <smeuse () mara org>
Date: Wed, 1 Aug 2018 07:48:01 -0600
Can your hfc customers do an igmp join? No? Then it's probably not considered "public". -Steve On Wed, Aug 1, 2018 at 5:21 AM Aaron Gould <aaron1 () gvtc com> wrote:
As you all have said, to confirm, I use ssm Mcast to distribute TV from satellite down links in the headend, out to a few different remote head ends. From there it's converted back to RF video and sent to subscribers via cable or hfc plant AaronOn Jul 31, 2018, at 5:15 PM, Job Snijders <job () ntt net> wrote:On Tue, 31 Jul 2018 at 23:29, Sean Donelan <sean () donelan com> wrote: Its tought to prove a negative. I'm extremely confident the answer isyes,public internet multicast is not viable. I did all the google searches, check all the usual CAIDA and ISP sites. IP Multicast is used on private enterprise networks, and some ISPs use it for some closed services. I got sent back with a random comment from a senior official saying "but I heard different." I bit my tongue, and said I would double (now quadruple) check. If any ISPs have working IP source-routed multicast on the public Internet that I missed, or what I got wrong. That's what content distribution networks (cdn's) are for instead.AS 2914 is working to fully dismantle all its Internet multicast related infrastructure and configs. All MSDP sessions have been turned off, wehavedeny-all filters for the multicast AFI, and the RPs have been shut down. For years we haven’t seen actual legit multicast traffic. Also the multicast “Default-Free Zone” has always been severely partitioned. Notallthe players were peering with each other, which led to significant complexity for any potential multicast source. Reasoning behind turning it off is that it limits the attack surface (multicast can bring quite some state to the core), reduces the things we need to test and qualify, and by taking this off the RFPs we can perhaps consider more vendors. However, as you noted; multicast within a single administrative domain (such as an access network distributing linear TV), or confined to purpose-built L3VPNs very much is a thing. On the public Internetmulticastseems dead. Kind regards, Job
Current thread:
- Re: Confirming source-routed multicast is dead on the public Internet Aaron Gould (Aug 01)
- Re: Confirming source-routed multicast is dead on the public Internet Steve Meuse (Aug 01)
- Re: Confirming source-routed multicast is dead on the public Internet Sean Donelan (Aug 01)
- Re: Confirming source-routed multicast is dead on the public Internet Hunter Fuller (Aug 01)
- <Possible follow-ups>
- Re: Confirming source-routed multicast is dead on the public Internet Mankamana Mishra (mankamis) via NANOG (Aug 01)
- Re: Confirming source-routed multicast is dead on the public Internet Dale W. Carder (Aug 01)
- Re: Confirming source-routed multicast is dead on the public Internet Saku Ytti (Aug 01)
- Re: Confirming source-routed multicast is dead on the public Internet Michael Crapse (Aug 01)
- Re: Confirming source-routed multicast is dead on the public Internet Tarko Tikan (Aug 01)
- Re: Confirming source-routed multicast is dead on the public Internet Mark Tinka (Aug 02)
- Re: Confirming source-routed multicast is dead on the public Internet Miles Fidelman (Aug 01)
- Re: Confirming source-routed multicast is dead on the public Internet Saku Ytti (Aug 01)