Re: IPv4 ANYCAST setup

[John Payne <john () sackheads org>]

On Mar 26, 2010, at 9:24 AM, Jeroen Massar wrote:

> InterNetX - Lutz Muehlig wrote:
> > Hello,
> >
> > has someone experience in anycast ipv4 networks (to support DNS)?
>
> "Never been done" "Dangerous" "TCP does not work" etc etc etc.

Can't really tell if you're being serious here due to caffeine underrun.
http://www.nanog.org/meetings/nanog37/presentations/matt.levine.pdf  
Slide 23 seems quite appropriate.

http://www.ripe.net/ripe/meetings/ripe-50/presentations/ripe50-plenary-tue-anycast.pdf
has links to other work on this.

It certainly seems to work "well enough".

> I assume quite a number of people know how to do it, especially as
> several root DNS servers abuse it.
>
> Simple recipe:
> - Box with:
>   - Your favourite OS
>   - Quagga or OpenBGPd
>   - Your favourite DNS server
> - Announce the IP of the anycast node in BGP
> - Monitor the DNS server, when it does not work kill your local BGPd
>   and notify the admins that it broke
>
> That is it. Probably with the above couple of things, google a bit and
> find the rest.
>
> Greets,
> Jeroen