4.6.1. Implementing IP Security
The NPS 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 NPS 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
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
d) Each IP Address consists of a series of four eight bit numbers. The number 255 is
used as a wild card.
NPS Series - Network Power Switches, User's Guide Start-Up / Configuration
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