[dns-operations] About open DNS resolvers
esolvepolito at gmail.com
Mon Aug 20 17:12:47 UTC 2012
I'm interested in issues on open DNS resolvers. In the following
It discusses how to probe open resolvers, but I have some questions
1 about the testing methodology, it needs to build a DNS server and
check whether it receives queries. Why can we just use "dig @target_ip
www.example.com" and see whether we can get a result?
2 for testing whether a ip is open resolver, the page recommends to
use the following command line:
dig +short 220.127.116.11.dnsbl.openresolvers.org
I test many IPs from the link:
and I got null results, which means
they are not open resolvers or they havn't been probed. for example, I
tested 18.104.22.168 and got null result
[usr at canard usr]$ dig +short
[usr at canard usr]$
But since I tested many ips and only got null results. Is my
testing wrong or not?
3 I tried
dig @22.214.171.124 www.google.com
and got no good results, but in the page, 126.96.36.199 is an open
4 is there anybody who has a open resolver list? if so, can you send
me a copy? I need them to do some tests, thanks!
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