gentoo-overlay/app-crypt/heimdal/files/krb5.conf

[libdefaults]
        default_realm = MY.REALM
#	clockskew = 300
#	v4_instance_resolve = false
#	v4_name_convert = {
#		host = {
#			rcmd = host
#			ftp = ftp
#		}
#		plain = {
#			something = something-else
#		}
#	}
	
[realms]
	MY.REALM = {
		kdc = MY.COMPUTER
	}
#	OTHER.REALM = {
#		v4_instance_convert = {
#			kerberos = kerberos
#			computer = computer.some.other.domain
#		}
#	}

[domain_realm]
	.my.domain = MY.REALM