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DNS client intermittently ignores server's response

in Oracle Solaris Networking (MOSC) Question

I'm installing 2 Solaris 11 systems in 2 different locations (but same vlan).

On both of these, and on no other system in our datacenters, I'm seeing intermittent name lookup failures.

Snooping a successful lookup on the DNS client, I see the request and the response, end of story.

40   0.89471 dnsclient.fqdn -> dnsserver.fqdn ETHER Type=0800 (IP), size=86 bytes
40   0.89471 dnsclient.fqdn -> dnsserver.fqdn IP  D=xxx.xxx.xx.xx S=yyy.yyy.yy.yy LEN=72, ID=26139, TOS=0x0, TTL=255
40   0.89471 dnsclient.fqdn -> dnsserver.fqdn UDP D=53 S=46252 LEN=52
40   0.89471 dnsclient.fqdn -> dnsserver.fqdn DNS C qq.qq.qqq.qqq.in-addr.arpa. Internet PTR ?

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