Western Telematic NPS-2HD manual Implementing IP Security

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5.6.1.Implementing IP Security

The NPS-2HD 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 5.6. Note that the Network Parameters menu is not available in User Mode.

2.When the Network Parameters menu appears, type 4 and press [Enter] to access the IP Security menu (Figure 5.6).

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

5-10numbers. The number 255 is used as a wild card.