6: Context sensitive help
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Simple Network Management Protocol (SNMP) is an Internet-standard protocol for managing devices on IP networks, in this case
GR/GM receivers. It can be used in network management systems to monitor receivers for conditions that warrant administrative
attention. It can also be used to monitor other IP based network devices like routers, switches or modems, as many modern network
devices support the SNMP protocol. This means that by using SNMP protocol all the devices of the network infrastructure
(communication devices and GNSS receivers) can be monitored if they support SNMP. This may help in tracking down network issues,
like malfunctioning routers, bandwidth issues and other problems that may affect the availability and reliability of GNSS network
services.
Talking in SNMP terminology, there is always an agent (e.g. a GR/GM receiver) and a manager (e.g. a network management/monitoring
system). An agent provides information that has to be requested by the manager.
Setting Descriptions
The table below describes the settings that can be configured on the SNMP page in order to activate the SNMP agent on a GR/GM
receiver.
Activate to allow SNMP access on port 161 via UDP. It allows a manager to query
MIB (Management Information Base) objects from the receiver.
Enter the community name. This is essentially a password to authorize access to the
GR/GM receiver when using SNMP. The community string is received with every
request and the receiver will only reply if the same string was sent as configured in
this text field.
GR/GM receivers only support ‘read-only’ access, independent of the community
string configured. ‘Read-write’ and ‘trap’ access is not supported at this stage.
By default the Community name is set to public.
Community strings are case sensitive.
Enter the location of the receiver (e.g. the address) to easily find it in case
maintenance is needed. This field can be left blank.
Enter the name and/or email address of the person responsible for this receiver to
easily get in contact with, in case maintenance is needed. This field can be left
Press to store the SNMP settings.
It is highly recommended that SNMP is not enabled when the receiver is connected to the Internet. The
SNMP community string authentication is sent unencrypted and considered a high security risk.
GR/GM receivers support SNMP versions v1, v2p and v2c.
Many different status variables can be queried and monitored using SNMP, for example:
Name, contact, location, ...
Availability, speed, MAC address, state, in/out octets, in/out pkts, in/out errors, IP
address, gateway address, netmask address, routing information, ...
Executed processes, CPU load per process, ...
These and many other parameters are listed in a "management information base". This is a virtual database that is used to managed all
SNMP parameters that can be requested. This is a tree-like structure of the management information base:
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