[root@localhost ~]# snmpwalk
-bash: snmpwalk: command not found
确保安装这几个包
# rpm -qa |grep snmp
net-snmp-5.1.2-11.EL4.7
net-snmp-libs-5.1.2-11.EL4.7
net-snmp-devel-5.1.2-11.EL4.7
net-snmp-utils-5.1.2-11.EL4.7
net-snmp-perl-5.1.2-11.EL4.7
请到安装盘里查找，一般在第4，5张光盘
net-snmp-utils-5.0.9-2.30E.15.i386.rpm
net-snmp-perl-5.0.9-2.30E.15.i386.rpm
...
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from:http://twpug.net/modules/newbb/viewtopic.php?post_id=9543
Fatal error: Call to undefined function: snmpwalk() in /home/httpd/html/snmp.php on line 3
Linux上使用的是net-snmp，则需要在./configure 时增加 --with-snmp 即可安裝成功。
[root@localhost php-4.3.4]# ./configure --prefix=/usr/local/php --with-apxs=/usr/local/apache/bin/apxs --with-xml --enable-sockets --with-zlib-dir=/usr/include --with-snmp
如果是ucd-snmp，则尝试在./configure 时增加 --enable-ucd-snmp-hack
from:http://www.vbulletin.com/forum/archive/index.php/t-114170.html
./configure异常情况解决：
异常一
configure: error: snmp.h not found. Check your SNMP installation.
This one's solved by:
# you must install net-snmp-devel
异常二
checking OpenSSL dir for SNMP... no
checking for net-snmp-config... /usr/bin/net-snmp-config
checking for snmp_parse_oid in -lnetsnmp... no
checking for init_snmp in -lnetsnmp... no
configure: error: SNMP sanity check failed. Please check config.log for more information.
This one's solved by:
# you must install elfutils-devel
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配置snmpd.conf文件：
# vi /etc/snmp/snmpd.conf
修改snmpd.conf文件
1、 com2sec notConfigUser default public
改为： com2sec notConfigUser 127.0.0.1 public
如果要在别的机器（192.168.11.50）上运行观测软件监测（本机ip是192.168.11.134），也应该再加上：
com2sec notConfigUser 192.168.11.50 public
2、 access notConfigGroup "" any noauth exact systemview none none
改为： access notConfigGroup "" any noauth exact all none none
3、#view all included .1 80
将前面的 # 注释 去掉。
#:wq
保存退出
# service snmpd restart