crypto/heimdal/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