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[MBONED] MNAT draft

"Holland, Jake" <jholland@akamai.com> Mon, 09 November 2020 17:41 UTC

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From: "Holland, Jake" <jholland@akamai.com>
To: "mboned@ietf.org" <mboned@ietf.org>
Thread-Topic: MNAT draft
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Date: Mon, 09 Nov 2020 17:28:01 +0000
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Subject: [MBONED] MNAT draft
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Hi mboned,

I also wanted to draw to your attention a new draft I'll be
going over in the upcoming meeting.  It's about automating
multicast NAT to get global multicast traffic delivered in
spite of restrictions that may prevent the use of the global
addresses inside particular networks, for a few different
reasons:
https://tools.ietf.org/html/draft-jholland-mboned-mnat-00

This work came out of the feedback I got about stoppers for
ISPs to deploy delivery for externally sourced multicast
traffic to clients inside their networks. So I think it's a
suitable topic for mboned to consider as part of solving that
end-to-end delivery problem.

I touched on this (under the name GNATS) in IETF 108[1], but
now I've finally posted a draft with something closer to a
detailed explanation of how it might work.  It's still kinda
rough, but feedback is very welcome.

I took Lenny's suggestion to call it "Multicast NAT", but
this name perhaps conflicts with some existing features in
existing routers[2] that are only loosely related to what
this doc is describing.  Maybe I need to change it to
"Multicast NAT Service" or something, or maybe it needs a
different name altogether, not sure.

I'm not sure how firm this particular approach is.  I'm still
working on cobbling together a prototype and might encounter
a need for some significant changes or extensions to the
model, but I wanted to get a strawman version out there to kick
around and see if anybody has a problem with the approach I'm
proposing.

Assuming I don't find a fatal flaw in this approach before we
meet, I'd like the WG to consider adoption (or suggest a
better path forward), so please take a look at the draft if
you get a chance.

Thanks and regards,
Jake

[1] Page 7-9 of the slides from mboned 108:
https://www.ietf.org/proceedings/108/slides/slides-108-mboned-status-update-on-multicast-to-the-browser-00.pdf#page=7

[2] For example, Juniper and Cisco each have configuration docs
for multicast NAT:
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipaddr_nat/configuration/xe-16/nat-xe-16-book/iadnat-multicast-dynamic.html
https://www.juniper.net/documentation/en_US/junos/topics/example/nat-multicast-traffic-configuring.html

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