snmpwalk的报错一例

在给squid配置了snmp后,用snmpwalk采集数据,总览一下:
snmpwalk 192.168.0.2 -v 2c -c public 1.3.6.1.4.1.3495
刷到最后爆出错误:
SNMPv2-SMI::enterprises.3495.1.5.2.1.1.218.28.141.150 = IpAddress: 218.28.141.150
SNMPv2-SMI::enterprises.3495.1.5.2.1.1.119.184.18.137 = IpAddress: 119.184.18.137
Error: OID not increasing: SNMPv2-SMI::enterprises.3495.1.5.2.1.1.218.28.141.150
>= SNMPv2-SMI::enterprises.3495.1.5.2.1.1.119.184.18.137
原来snmp默认在抓取oid的时候,是按顺序递增下去请求的,而squid的最后一个1.5.2.1类别,是客户端数据,IP是分散的,所以218没法增长到119,于是就出错退出了。
解决方法很简单,加上-Cc参数即可,help说明如下:
-C APPOPTS Set various application specific behaviours:
p:  print the number of variables found
i:  include given OID in the search range
I:  don’t include the given OID, even if no results are returned
c:  do not check returned OIDs are increasing
t:  Display wall-clock time to complete the request
不过这里加上-Cc后,简直就是在刷屏了,无数客户端ip全部都要打印出来,慎用慎用……