openssh/README.kerberos

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This version of the Kerbros/GSSAPI support avoids DNS lookups
for Kerberos-related names. These DNS lookups were problematic
for dialup users because they would lead to excessive delays
if DNS was not reachable.
In order to disable these lookups, I had to change the default
configuration, disabling GSSAPI authentication.
If you do use Kerberos, please make sure you edit the server and
client configuration files as follows:
/etc/ssh/sshd_config:
GSSAPIAuthentication yes
GSSAPICleanupCredentials yes
/etc/ssh/ssh_config:
Host *
... lots of other options ...
GSSAPIAuthentication yes
GSSAPIDelegateCredentials yes