DNS Trivia

F Root Traffic, 98% bogus (CADIA study)

50% of the root server traffic comes from only 220 IP addresses

78% due to firewalling, client retries

12% of the queries for non existent TLD's

Microsoft Resolver Bug

queries for localhost repeated 8–12 times per second

Good paper, recommended read.

Given these issues the root servers are increasingly getting geographic redundancy via anycasting

$ for i in `printf "%s " {a..m}`; \ 
do mtr -4 -r -c 2 $i.root-servers.net \
| tail -1 | awk '{print $2": " $1}' ; done
???: 11.
b.root-servers.net: 14.
c.root-servers.net: 16.
d.root-servers.net: 17.
???: 11.
f.root-servers.net: 8.
???: 11.
???: 18.
i.root-servers.net: 4.
j.root-servers.net: 14.
k.root-servers.net: 14.
l.root-servers.net: 13.
M.ROOT-SERVERS.NET: 17.

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