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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 addresses. Mask 2
then grants access to all addresses that begin with 192. Finally,
Mask 3 specifically blocks access by 192.1.1.5.
Note:
· Mask #5 has priority over the other four masks. If
Mask #5 is set to deny access by "255.255.255.255"
(all wild cards), you will not be able to access the IPS
Command Mode via network. Access will only be
allowed via a Local PC or external modem connected
to the IPS Console Port.
·
When using the wild card address "255.255.255.255",
make certain that at least one higher priority mask
permits access by your IP address.
5.3.4. The Telnet Parameters Menus
The Telnet Parameters Menus are used to enable/disable Telnet
access to the IPS command mode and select the default TCP port for
Telnet connections.
Web Browser Interface: Click the "Setup" button to access the
configuration menus, and then click the "Telnet Parameters" button
to display the menu shown in Figure 5.10.
Text Interface: Type /T and press [Enter]. The Telnet Parameters
Menu will be displayed as shown in Figure 5.11.
Figure 5.9: IP Security Menu - Text Interface