The system administrator may want to limit the number of simultaneous logons from specific IP Addresses. This is especially useful for ASP environments where many users access the GSW UTS from locations that can be identified by a specific IP Address. The system administrator may want to limit the number of simultaneous connections for a variety of reasons that range from server resource allocation to purchased access.
Restrictions based on the number of sessions originated from specific IP Addresses are enforced when the file gs_l_ip.txt exists. IP Addresses with connection restrictions counts are listed in the gs_l_ip file. For each entry in the gs_l_ip file two fields are specified: The IP Address and the Count.
Notice the file in the GSW UTS installation directory:
The file must reside in the Georgia SoftWorks Universal Terminal Server installation directory.
Note: The system account must have permission to read the gs_l_ip.txt file.
It is a text file
The # character is the comment character.
Each entry must start in the first column.
Each entry consists of the IP Address (or IP Address Range) and the Count.
The IP Address and the Count are separated by a single space.
Following are example gs_l_ip.txt file.
ACME ASP is an Application Service Provider where they have a Medical Database Lookup Application (MDLA) located on a server at their headquarters. They sell access to the MDLA based to companies where pricing is based on the number simultaneous connections. Due to the sensitive nature of Medical information access is only granted from specific locations that can be associated with known IP Addresses. In addition, each User has access to private medical information based on their User ID. The typical ACME customer may have 300 users that need access to the MDLA but no more than 20 will be using the system at any given time.
Currently AMCE has sold access to the MDLA to 4 companies. Two companies purchased twenty connections each; the remaining two companies purchased twenty-five connections each.
ACME only wants to restrict each company to the number of sessions that they have purchased.
The ACME System Administrator can configure the gs_l_ip.txt file that specifies the number of sessions allowed for each User ID. The Information for each company is:
| Company Name | IP Address or Range | Number of Concurrent Sessions |
| Health Matters Inc. | 192.71.34.107 | 20 |
| Live Long Insurance | 170.40.255.231 | 25 |
| Grow Tall Pharmaceutical
(They want access from any the following IP Addresses to work.) |
164.10.15.210 164.10.15.220
164.10.15.211 164.10.15.221 164.10.15.212 164.10.15.222 164.10.15.213 164.10.15.223 164.10.15.214 164.10.15.224 164.10.15.215 164.10.15.225 164.10.15.216 164.10.15.226 164.10.15.217 164.10.15.227 164.10.15.218 164.10.15.228 164.10.15.219 164.10.15.229 164.10.15.230 |
20 |
| Sharp Doctors for You
(Sharp Doctors for You has a large range of IP Addresses that are valid.) |
205.20.63.0
through 205.20.63.255 |
25 |
This is how to set up the gs_l_ip.txt file to limit the number of connections for each company.
Edit the file gs_l_ip.txt and add the following lines. (Be sure to start in column one)
192.71.34.107 20
170.40.255.231 25
164.10.15.210-164.10.15.230 20
205.20.63.* 25
Each time a logon request occurs the GSW Universal Terminal Server determines if the number of active sessions associated with that the originating IP Address. If the count of active sessions exceeds the configured count in the gs_l_ip.txt file then the Logon is denied
Note 1: An Address range is specified in line 3.
164.10.15.210-164.10.15.230 20
This translates to include all IP Addresses between:
164.10.15.210 and 164.10.15.230
A sample gs_l_ip.txt file with examples is installed with the software. It can be easily modified and used for your purposes
Note 2: An Address Wild Chard is specified in line 4.
205.20.63.* 25
This translates to include all IP Addresses no matter what the values for the last field. The list below helps visualize the IP addresses included.
A sample gs_l_ip.txt file with examples is installed with the software. It can be easily modified and used for your purposes