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Re: IPV6 Anycast for streaming
From: Christopher Morrow <morrowc.lists () gmail com>
Date: Sun, 12 Aug 2012 13:09:56 -0400

On Sun, Aug 12, 2012 at 5:25 AM, Oliver
<olipro () 8 c 9 b 0 7 4 0 1 0 0 2 ip6 arpa> wrote:
On Sunday 12 August 2012 04:11:25 Voice of the Blind ™ Network Operation
wrote:
Hello,
is a anycasted Prefix a good idea for Streaming?
here's what we're thinking about:
1. get a /48 from a LIR or a RIR and anounce it through Hurricanne
through several Tunnel server including Singapor, New york and
Amsterdam
2. run 3 diferent Icecast server  in each of the locations where
frankfurd would be the Master Server while the 2 others would be a
slave relay
3. Assign same Ipv6 address to each of the icecast server where we
would be using other prefix to do Inter server communication
so if someone is in North America would go through new york, if is in
south east asia would be throug SG, otherwise africa/Europ would go
through Frankfurd
is that a good idea for streaming performance ?
any other suggestion is welcome
Thank you

What you are talking about isn't really Anycast from the perspective of the
rest of the world since what you're saying sounds like you'll just be single-
homed behind HE.

anycast can take many forms, including anycast inside a single ASN
which to the outside world looks like a single announcement (or even
an announcement covered by an aggregate) - 4.2.2.2 falls into that
sort of deployment, I believe.

Regardless of whether you peer with HE in multiple locations or just one, the
AS path is still going to be the same and will enter into 6939 at whatever the
BGP-closest point is - the Anycast aspect essentially exists only between you
and HE.

well, if he's proposing a 'single server' (simplistic on my part) at
each of 3 locations which then has some routing gear (or quagga?)
linking it to HE ... that's 'anycast' (in the same way as many root
server operators do it)

Providing HE are configuring a discriminator across their iBGP routers to take
the shortest path at entry points you're not directly peered to, the whole
thing should Just Work, sudden topology changes notwithstanding.

agreed. One would probably be interested in not the 'anycast' so much
as 'why are you doing 3 deployments'? and maybe: "is redundancy and
traffic direction something better done in DNS than BGP"? questions.

-chris


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