User’s Manual
Synaccess Networks, Inc.
www.synaccess-net.com
(760) 930 – 0473 Page 13 of 46
2)
Higher mask number has higher priority. If an IP is blocked by Mask 3 and then enabled
by Mask 4, the result is the IP is permissible.
3)
A dotted value in a Mask is either 255 (which Permits or Blocks a whole range of the byte)
or a specific value from 0 to 254 (which Permits or Blocks that specific value).
4)
If you enter the ACL data with unintended values that block your current access to the
system, you must use local RS-232 connection to disable the ACL, and then re-establish
the network connection.
Examples:
Only Permit 192.168.5.100 & 192.168.5.105. Block all other IPs.
Define Mask 1 to Block mode: 255.255.255.255. // Block al
Define Mask 2 to Permit mode: 192.168.5.100.
Define Mask 3 to Permit mode: 192.168.5.105.
Define all other Mask to Don't Care mode.
Only Permit 192.168.x.x.
Define Mask 1 to Block mode: 255.255.255.255. // Block all IPs
Define Mask 2 to Permit mode: 192.168.255.255.
Define all other Mask to Don't Care mode.
Only Block 192.168.5.100 and block 10.10.x.x.
Define Mask 1 to Block mode: 192.168.5.100.
Define Mask 2 to Block mode: 10.10.255.255.
Define all other Mask to Don't Care mode.
2.6 Telnet Access:
With Telnet access, you are able to communicate with an active user serial console port and
exchange user data as if you were directly connected to the port. You are also able to send control
commands to the system when the first letter of a line entry at Tenet terminal is a predefined
command prefix letter, such as “/” (the default symbol). Operation of on a Telnet terminal is
almost identical to the access method via Local Master Serial Port. You need to make sure that
Telnet access is enabled, as a default setting. If the access is not enabled, please refer to Section
“Using Configuration Menu” to change the setting.
Before you start the Telnet application, you need to obtain the actual IP address for the system.
The system displays network connectivity information at system startup terminal when your work
station is connected to the system’s Local Master Serial Port. Please refer to “TCP/IP Network
Configuration” section of this document for information about on how to setup the network
parameters.
Once the network connection is established, at your work station prompt, you need to enter:
telnet ip_addr
The telnet terminal screen will display the following message once it starts, shown in Figure 7.
You need to set a Telnet session on your work station to Local Echo Off mode. The NPC-48 or
NPC-22 does not echo user data locally on the Telnet session. It is up to the connected user