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### [kdcdefaults]

The following relation is defined in the [kdcdefaults] section:

kdc_ports
  This relation lists the ports on which the Kerberos server should listen for UDP requests by default. This list is a comma separated list of integers. If this relation is not specified, the compiled-in default is 88,750, the first being the assigned Kerberos port and the second which was used by Kerberos V4.
kdc_tcp_ports
  This relation lists the ports on which the Kerberos server should listen for TCP connections by default. This list is a comma separated list of integers. If this relation is not specified, the compiled-in default is not to listen for TCP connections at all.

  If you wish to change this (which we do not recommend, because the current implementation has little protection against denial-of-service attacks), the standard port number assigned for Kerberos TCP traffic is port 88.

v4_mode
  This string specifies how the KDC should respond to Kerberos 4 packets. The possible values are none, disable, full, and nopreauth. The default value is none.