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Monitoring Tools 7-59
By default, the read-only and read/write community strings are set to “public” and “private,” respectively. You
should change both of the default community strings to values known only to you and trusted system adminis-
trators.
To change a community string, select it and enter a new value.
Setting the Read-Only and Read-Write community strings to the empty string will block all SNMP requests to the
Netopia D-Series. (The Netopia D-Series may still send SNMP Traps if those are properly enabled.)
This allows the administrator to block SNMP access to the Netopia D-Series, and to provide more granular
control over the allowed SNMP operations to the Netopia D-Series.
■ Setting only the Read-Write community string to the empty string will block SNMP Set Requests to the
Netopia D-Series, but Get Requests and Get-Next Requests will still be honored using the Read-Only
community string (assuming that is not the empty string).
■ Setting only the Read-Only community string to the empty string will not block Get Requests or Get-Next
Requests since those operations (and Set Requests) are still allowed using the (non-empty) Read-Write
community string.
Even if you decide not to use SNMP, you should change the community strings. This prevents unauthorized
access to the Netopia D-Series through SNMP. For more information on security issues, see “Security” on
page 8-61.
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An SNMP trap is an informational message sent from an SNMP agent (in this case, the Netopia D-Series) to a
manager. When a manager receives a trap, it may log the trap as well as generate an alert message of its own.
Standard traps generated by the Netopia D-Series include the following:
■ An authentication failure trap is generated when the Netopia D-Series detects an incorrect community
string in a received SNMP packet. Authentication Traps Enable must be On for this trap to be generated.
■ A cold start trap is generated after the Netopia D-Series is reset.
■ An interface down trap (ifDown) is generated when one of the Netopia D-Series’s interfaces, such as a
port, stops functioning or is disabled.
■ An interface up trap (ifUp) is generated when one of the Netopia D-Series’s interfaces, such as a port,
begins functioning.
The Netopia D-Series sends traps using UDP (for IP networks).
You can specify which SNMP managers are sent the IP traps generated by the Netopia D-Series. Up to eight
receivers can be set. You can also review and remove IP traps.
To go to the IP Trap Receivers screen, select IP Trap Receivers. The IP Trap Receivers screen appears.