[98366] in North American Network Operators' Group
Re: large organization nameservers sending icmp packets to dns servers.
daemon@ATHENA.MIT.EDU (John Levine)
Mon Aug 6 13:23:20 2007
Date: 6 Aug 2007 17:21:49 -0000
From: John Levine <johnl@iecc.com>
To: nanog@nanog.org
In-Reply-To: <20070806161304.0BABB7660C3@berkshire.machshav.com>
Errors-To: owner-nanog@merit.edu
>> Sounds like one of the global-scale load balancers - when you do a
>> (presumably) recursive DNS lookup of one of their hosts, they'll ping
>> the nameserver from several locations and see which one gets an
>> answer the fastest.
Why would they ping rather than just sending the query to all of the
NS and see which one answers first? It's an IP round trip either way.
I agree that pinging is harmless, but for this application it seems
pointless, too.
R's,
John
