User`s guide
IP SECURITY
1. Security Mask #1: (none)
2. Mask #1 Action: Permit
3. Security Mask #2: (none)
4. Mask #2 Action: Permit
5. Security Mask #3: (none)
6. Mask #3 Action: Permit
7. Security Mask #4: (none)
8. Mask #4 Action: Permit
9. Security Mask #5: (none)
10. Mask #5 Action: Permit
Enter Selection or <ESC> to Exit
Figure 8: IP Security Menu
Access the Network Parameters menu as described in Section 4.6. Note that the Network Parameters menu is not
available in User Mode.
1.
When the Network Parameters menu appears, type 4 and press [Enter] to access the IP Security menu (Figure 8).2.
The IP Security menu lists five IP Security "masks" along with the selected permit/deny action for each mask.
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.
.
Masks are listed in order of ascending priority; Mask 1 has the lowest priority, Mask 5 has the highest
priority.
b.
Masks have a cumulative effect; high priority masks supersede the effect of lower priority masks.c.
Each IP Address consist of a series of four eight bit numbers. The number 255 is used as a wild card.d.
3.
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 Address. Mask #2 then specifically grants access to 192.1.1.5 only.
Example 2: Allow access only by addresses that begin with 192.
Security Mask #1: 255.255.255.255 Mask #1 Action: Deny
Security Mask #2: 192.255.255.255 Mask #2 Action: Permit
Since 255 is a wild card, Mask 1 blocks all IP address. Mask 2 then grants access to all address that begin with 192.
Example 3: Allow access only by addresses that begin with 192, deny access to 192.1.1.5.
Security Mask #1: 255.255.255.255 Mask #1 Action: Deny
Security Mask #2: 192.255.255.255 Mask #2 Action: Permit
Security Mask #3: 192.1.1.5 Mask #3 Action: Deny
Since 255 is a wild card, Mask 1 blocks all IP address. Mask 2 then grants access to all addresses that begin with 192.
Finally, Mask 3 specifically blocks access by 192.1.1.5.
NPS Series Network Power Switch -- User's Guide
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