Chapter 4
LabVIEW Real-Time Programming
©
National Instruments Corporation
4-5
cFP-21xx and cFP-BP-x User Manual
permitted or denied access. If an entry in the list matches the host PC
address, the Real-Time Engine either allows or denies access based on what
you define for the entry. If a subsequent entry also matches the host PC
address, that permission is used in place of the previous permission. For
example, in the RT Target: Access dialog box shown,
a.test.site.com
and
b.test.site.com
are permitted access even though the list indicates
by the * wildcard that all addresses ending in
.test.site.com
are denied
access. A checkmark next to a list entry denotes that access is permitted,
while an
X
denotes that access is denied. If no entry matches the host PC
address, access is denied unless you supply a password.
Table 4-1 shows examples of RT Target Access List entries and provides
information about the * wildcard and permitting matching access entries.
To specify an Internet host address, enter its domain name or IP address.
Use the * wildcard when specifying Internet host addresses. For example,
you can specify all hosts within the domain
site.com
with the entry
*
.site.com
. You can specify all hosts in the subnet whose first two
numbers are 130.164 with the entry
130.164.
*. The entry * matches all
addresses.
In the RT Target: Access dialog box previously shown, all hosts in
the
site.com
domain can target the Real-Time Engine, with the exception
of all hosts in the
test.site.com
domain. Additionally, the hosts
a.test.site.com
,
b.test.site.com
, and
130.164.123.123
also
can target the Real-Time Engine. The host
public.site.com
does not
have access, even though it is in the
site.com
domain.
Table 4-1.
Example RT Target Access List Entries
Access String
Matches
*
All hosts
test.site.com
The host whose domain name is
test.site.com
*
.site.com
All hosts whose domain names end
with
.site.com
130.164.123.123
The host with the IP address
130.164.123.123
130.164.123.
*
All hosts whose IP addresses start
with
130.164.123
