Linux下net-snmp配置snmpv3用户方法

snmp V3的方式设置简单，而且安全性更高。

配置方法：
1.停止snmpd服务
  #service snmpd stop

2.增加snmpv3用户，并设置认证以及加密方式
  # net-snmp-create-v3-user
    Enter a SNMPv3 user name to create:
    enocsnmpv3
    Enter authentication pass-phrase:
    enocsnmpv3pw
    Enter encryption pass-phrase:
    [press return to reuse the authentication pass-phrase]
    enocsnmpv3pk
    adding the following line to /var/lib/net-snmp/snmpd.conf:
       createUser enocsnmpv3 MD5 "enocsnmpv3pw" DES enocsnmpv3pk
    adding the following line to /etc/snmp/snmpd.conf:
       rwuser enocsnmpv3

3.启动snmpd服务
 # service snmpd restart

现通过snmpwalk测试一下：
# snmpwalk -v3 -uenocsnmpv3 -lauth -aMD5 -A"enocsnmpv3pw" -X"enocsnmpv3pk" localhost  | more
SNMPv2-MIB::sysDescr.0 = STRING: Linux CentOS60A 2.6.32-71.el6.i686 #1 SMP Fri Nov 12 04:17:17 GMT 2010 i686
SNMPv2-MIB::sysObjectID.0 = OID: SNMPv2-SMI::org
DISMAN-EVENT-MIB::sysUpTimeInstance = Timeticks: (9443) 0:01:34.43

或：
# snmpwalk -v3 -uenocsnmpv3 -lauth -aMD5 -A"enocsnmpv3pw"  localhost .1 | more
或：
# snmpwalk -v3 -lauth -uenocsnmpv3 -aMD5 -xDES -A"enocsnmpv3pw" -X"enocsnmpv3pk" localhost .1 | more

补充：
SNMP Version 3 specific
  -a PROTOCOL           set authentication protocol (MD5|SHA)
  -A PASSPHRASE         set authentication protocol pass phrase
  -e ENGINE-ID          set security engine ID (e.g. 800000020109840301)
  -E ENGINE-ID          set context engine ID (e.g. 800000020109840301)
  -l LEVEL              set security level (noAuthNoPriv|authNoPriv|authPriv)
  -n CONTEXT            set context name (e.g. bridge1)
  -u USER-NAME          set security name (e.g. bert)
  -x PROTOCOL           set privacy protocol (DES|AES)
  -X PASSPHRASE         set privacy protocol pass phrase
  -Z BOOTS,TIME         set destination engine boots/time