C: Snmp Support; Support; Security - Lantronix SCS Reference Manual

C: SNMP Support

SNMP is an abbreviation for Simple Network Management Protocol. SNMP commands enable users
(usually system administrators) to get information from and control other nodes on a local area network.
Information about SNMP can be obtained in RFCs (Request For Comments) which can be obtained via
anonymous FTP from nisc.jvnc.net. To obtain a specific RFC, use the pathname pub/RFC/ rfcnnn, where
nnn is the name of the desired RFC. To obtain the RFC index, use the pathname pub/RFC/rfc-index.txt.
The extent to which other nodes may be controlled and/or queried for information is documented in
Management Information Bases (MIBs). The MIBs and SNMP in general are documented in RFCs 1066,
1067, 1098,1317, 1318, and 1213.
MIB
MIB-II (RFC 1213):
RS-232 MIB (RFC 1317):
Character MIB (RFC 1318):
C.1 Support
The SCS will respond to queries for unknown MIBs with a "not in MIB" error to the requesting host.
The SCS has a local SNMP security table to restrict or prevent unauthorized SNMP configuration.
The SCS will also generate limited forms of 3 of the SNMP traps. Traps are sent to a host when an
abnormal event occurs on the SCS.
Currently, the SCS will generate a Coldstart trap when it first boots, and will send a Linkup trap when the
startupfile (if any) has been read from a host and normal operation commences. If a startupfile has been
configured but the download fails, the SCS will send an Authentication trap. In all 3 cases, the trap will be
directed to the IP address of the loadhost for the SCS. If a loadhost has not been specified (Flash ROM based
units, for example), the traps will not be sent. The SCS will not generate traps other than the cases listed
here.
C.2 Security
Because SNMP can be used to change security settings, the SCS provides a security mechanism for
restricting SNMP access to the unit. The security mechanism is linked to the SNMP community name. By
default, the only allowed community name is Public, which is given only Read privilege.
Table C-1: Supported MIBs
Description
System, Interface, Address Translation, IP, ICMP, TCP, and
UDP. They do not support the EGP group.
All objects (RS-232-style objects).
All objects (character-oriented devices).
C-1