How to tell if something is anycasted?

Joe Abley jabley at ca.afilias.info
Wed May 17 20:33:00 UTC 2006


On 17-May-2006, at 10:45, bmanning at vacation.karoshi.com wrote:

> well Peter, ONE root server operator has that practice.  Others
> have different practices regarding anycast.

Actually, it looks to me like all thirteen root servers answer  
"HOSTNAME.BIND CHAOS TXT" queries (J might check for trailing dots,  
maybe ;-) and also that F and C share a strikingly similar naming  
scheme.

[octopus:~]% for n in a b c d e f g h i j k l m; do
for> echo -n "trying ${n}... "
for> dig @${n}.root-servers.net hostname.bind chaos txt +short
for> done
trying a... "ns6-aroot"
trying b... "b3"
trying c... "ord1a.c.root-servers.org"
trying d... "d-root.net.umd.edu"
trying e... "e4.arc.nasa.gov"
trying f... "yyz1b.f.root-servers.org"
trying g... "g.root-servers.net"
trying h... "H1"
trying i... "s1.was"
trying j... "jns1-kr.j.root-servers.net.j.root-servers.net"
trying k... "k2.nap"
trying l... "l1.l.root-servers.org"
trying m... "M-SFO-1"
[octopus:~]%


Joe



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