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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
numbers. The number 255 is used as a wild card.