[Bug 424371] Re: Logins to OpenSSH server slow due to "UseDNS yes" config

[Rodney Beede]

I'd propose submitting a request upstream to make the default setting
for UseDNS be No.

Additionally add comments in the sshd_config and man page:

# UseDNS - Determines whether IP Address to Hostname lookup and comparison is performed
# Default value is No which avoids login delays when the remote client's DNS cannot be resolved
# Value of No implies that the usage of "from=" in authorized_keys will not support DNS host names but only IP addresses.
# Value of Yes supports host names in "from=" for authorized_keys.  Additionally if the remote client's IP address does not match the resolved DNS host name (or could not be reverse lookup resolved) then a warning is logged.
# UseDNS Yes

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https://bugs.launchpad.net/bugs/424371

Title:
  Logins to OpenSSH server slow due to "UseDNS yes" config

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