[dns-operations] IPv6 PTR records

Chris Adams cmadams at hiwaay.net
Fri Dec 17 19:32:12 UTC 2010

Once upon a time, Douglas C. Stephens <stephens at ameslab.gov> said:
> A case in point is SSHd.  Many of the other sites running
> SSHd to which my customers connect are using versions of SSHd which
> stall and time-out if PTR records for my client-side IPs are not
> available.

I've not seen that behavior from OpenSSH (or any other server for that
matter).  It may stall if lookups don't return (e.g. bad DNS server,
broken network, etc.), but an NXDOMAIN doesn't cause any slowdown.

Chris Adams <cmadams at hiwaay.net>
Systems and Network Administrator - HiWAAY Internet Services
I don't speak for anybody but myself - that's enough trouble.

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