root servers

Mark_Andrews at Mark_Andrews at
Wed Dec 11 22:03:55 UTC 2002

> phn at wrote:
> > 
> > Damien SOULIER <damien.soulier at> wrote:
> > > I have one question and i can't find any answer.
> > > Why there is only 13 root servers.
> > > If someone can give me an answer, it will be fine.
> ..snip..
> > -  13 is pretty much he limit to pack in one answer.
> Provided that answer packs down to 512 octets or less, which is
> when older resolvers switch from UDP to TCP and bump up the work
> load required to supply the list of root name servers as an
> answer.
> So more than 13 would increase the work load, I assume also for
> many referals. I guess it would be a lame hack to hack the root
> name servers, and them up the size of the zone just to see if it
> could be used to grind the Internet to a standstill.
> Of course there could be more than 13, if they were meddling
> with the routing underneath to create multiple copies of the
> same server around the world, but they haven't done that yet
> AFAIK, but there was talk of multiple F's.

	There are a lot more than 13 machines behind the 13 addresses
	associated with ?  Almost/all of the
	address have multiple machines with a frontend distributing
	traffic between them.

	F is just going to use bgp to distribute the load to multiple
	boxes in addition to using frontend boxes to distribute the
	load between the local cluster.

Mark Andrews, Internet Software Consortium
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark.Andrews at

More information about the bind-users mailing list