Net-snmp is a free, open source SNMP implementation, formerly known as UCD-SNMP. It includes the source code for the agent and multiple administrative tools, and supports a variety of extension methods. About Simple http://www.aliyun.com/zixun/aggregation/14045.html "> Network Management protocol includes an extensible agent, SNMP Library, tool request or set up SNMP agent, tool generating and handling SNMP traps, A version of Unix "Netstat" that uses SNMP and a Tk/perl MiB browser command. It was originally implemented according to the Carnegie Mellon University SNMP Implementation (version 2.1.2.1), but has greatly enhanced, transplanted and reinforced, barely resembling the original package.
Net-snmp 5.7 Notable features and improvements include: better support for small environments, ping and tracking routing MIB Linux implementations, scheduled/via notifications, better multihomed IP address support, SNMP over Dtls via ipv6,snmpwalk per variable timer, Improved SSH's ability to support SNMP, build a host name without usm,dnssec authentication, improve unit testing, and more.
Detailed update log see: http://www.net-snmp.org/about/ChangeLog.html
Download Address:
Http://sourceforge.net/projects/net-snmp/files/net-snmp/5.7/net-snmp-5.7.zip/download
Http://sourceforge.net/projects/net-snmp/files/net-snmp/5.7/net-snmp-5.7.tar.gz/download