Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
Chapter 3 - Basic Setup for Operation
SNMP Access Gateway User’s Manual - v1.0 -- 11/99 - Page 7
Chapter 3 - Basic Setup for Operation
3.1 - Network Setup
As with all TCP/IP- or SNMP-based devices, the SNMP Access Gateway requires an IP address to be assigned to
each unit in order to send and receive TCP/IP or SNMP data. The SNMP Access Gateway may operate with either a
statically or dynamically allocated IP address.
When statically allocated, the SNMP Access Gateway must be configured with an IP address, network address mask,
and default router prior to being used on the network. This configuration may be made by a local command port. It
can not be made via a TCP/IP (network) connection, as use of such connections would first require the setting of the
IP address.
The IP address may be dynamically allocated using either BOOTP or DHCP. By default, the SNMP Access
Gateway is configured to use BOOTP or DHCP to dynamically obtain its IP address, network address mask, default
router, etc. When booting, the SNMP Access Gateway transmits a BOOTP/DHCP request. This request is
responded to by any BOOTP or DHCP servers configured to allocate an IP address to the SNMP Access Gateway.
When the SNMP Access Gateway receives its first response from the BOOTP/DHCP request, then the SNMP
Access Gateway either uses the BOOTP reply or engages in a DHCP session to dynamically establish the network
settings of the SNMP Access Gateway.
The SNMP Access Gateway expects to be on a local area network, or to use the default router in the case where an
IP destination is determined to not be a local address. The SNMP Access Gateway uses the destination IP address
and the network address mask to determine if the destination IP address is a local address or not. If so, then the IP
frame is sent to the destination IP address on the local network. If not, then the IP frame is sent via the default
router. If no default router is configured (the address is 0.0.0.0) then no IP frame is sent when the SNMP Access
Gateway determines that the IP frame must be routed and no router exists. If an SNMP management station will be
used which is not on the local network, then the configuration of the default router should be verified. See the use of
the PING command in verification that a route to each management station exists and is usable.
The SNMP Access Gateway provides TCP/IP connections using ports 23 and 2000. Up to three concurrent
connections may be made using these port numbers. When a port address of 23 is used, the telnet character
processing (interpretation of IAC codes, option negotiation, etc.) is performed in both directions of data flow. When
a port address of 2000 is used, no telnet character processing is performed. Other than this difference, the use of port
23 or port 2000 is identical. The SNMP Access Gateway also uses ports 20 and 21 when providing the FTP server
functions.
The SNMP Access Gateway has a configurable list of IP restrictions. This list may be used to restrict IP access to
the SNMP Access Gateway to only certain networks or certain IP addresses, reject connection from certain IP
networks or addresses, etc. This may be used to provide greater security features than a password alone. The IP
restriction table is established using the SETUP command on the NETWORKING menu. If the IP restriction table is
empty, then all networks and IP addresses are allowed to connect to the SNMP Access Gateway. By entering IP
restrictions in the table, then certain networks or IP addresses can be restricted. See the App Note A. Use of IP
Restrictions for more information on the use of IP restrictions. By default, no IP restrictions are established.
3.2 - Local Command Mode
The serial port labeled I/O 2 may be used for local command mode. This mode is entered by either holding in the
PRG button on the front panel for about five seconds, until the power LED starts flashing on at off, or by entering the
(programmable) escape character three times within 3 seconds on the I/O 2 serial port.
When in local command mode, the baud rate and serial port parameters of I/O 2 remain the same.
A user may exit local command mode by four methods. Using the EXIT or BYE command will terminate local
command mode. Waiting five minutes without entering a command will also terminate local command mode.
Additionally, resetting the SNMP Access Gateway with the RST button will also exit local command mode.
To Next Page
Loading...