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4.6.1. Implementing IP Security
The TPS can be configured to restrict unauthorized IP addresses from Telneting to the unit. This allows
the user to grant Telnet access to only a specific group of IP addresses, or block a particular IP address
from gaining access. In the default state, the TPS accepts incoming IP connections from all hosts. To
configure the IP Security feature, proceed as follows:
1. Access the Network Parameters menu as described in Section 4.6. Note that the Network
Parameters menu is not available in User Mode.
2. When the Network Parameters menu appears, type 4and press [Enter] to access the IP Security
menu (Figure 8).
3. The IP Security menu lists five IP Security "masks" along with the selected permit/deny action for
each mask.
a) Each Security Mask prompt is used to define a specific IP address or range of IP addresses.
Each Mask Action prompt is used to define the permit/deny action for the corresponding Mask.
b) Masks are listed in order of ascending priority; Mask 1 has the lowest priority, Mask 5 has the
highest priority.
c) Masks have a cumulative effect; high priority masks supersede the effect of lower priority
masks.
d) Each IP Address consists of a series of four eight bit numbers. The number 255 is used as a
wild card.
Example 1: Deny access to all hosts except 192.1.1.5:
Security Mask #1: 255.255.255.255 Mask #1 Action: Deny
Security Mask #2: 192.1.1.5 Mask #2 Action: Permit
Since 255 is a wild card, Mask #1 blocks all IP Addresses. Mask #2 then specifically grants access to
192.1.1.5 only.
15
TPS Series Telnet Power Switches; User's Guide Start-Up / Configuration
IP SECURITY
1. Security Mask #1: (undefined)
2. Mask #1 Action: Permit
3. Security Mask #2: (undefined)
4. Mask #2 Action: Permit
5. Security Mask #3: (undefined)
6. Mask #3 Action: Permit
7. Security Mask #4: (undefined)
8. Mask #4 Action: Permit
9. Security Mask #5: (undefined)
10. Mask #5 Action: Permit
Enter Selection or <ESC> to Exit
Figure 8: IP Security Menu
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