On CoreOS, runnng openssh sshd version "OpenSSH_6.6p1-hpn14v4, OpenSSL
1.0.1g", when connecting the following query is sent to the DNS server:
query[A] 2.2.0.10.in-addr.arpa
Which makes no sense, it's an "A" request for a reverse record.
Adding "UseDNS no", prevent the request (proving that the request does come
from sshd).
When connecting to machines with older sshd (OpenSSH_6.6.1p1, OpenSSL 1.0.1f)
the request is a PRT request as expected.
Any idea why this is happening? Is this a change in sshd or some other
configuration on the server?
--
Yves.
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