North American Network Operators Group

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Re: Anycast 101

  • From: Marshall Eubanks
  • Date: Fri Dec 17 10:02:01 2004

On Fri, 17 Dec 2004 14:16:58 +0000
 [email protected] wrote:
> > That's not the point. If without anycast this is better than with 
> > anycast, then this should go on the "con" list for anycast.
> People often confuse two separate technical things
> here. One is the BGP anycast technique which allows
> anycasting to be used in an IPv4 network, and the 
> other is the application of BGP anycasting to DNS
> in an IPv4 network. It would be clearer if people
> would prefix "anycast" with either BGP or DNS to make

There is also MSDP anycasting, which is both pretty cool and
close to best common practice for anyone running MSDP.


> it clear which they are talking about. Conceivably
> there could be other applications that could be
> distributed using BGP anycast. And if those applications
> are designed knowing the quirks of BGP anycasting
> then presumably they would have ways to overcome
> some of the issues that affect DNS.
> I would reword your statement as follows.
> ... then this should go on the "con" list for
> DNS anycasting.
> --Michael Dillon