关于ԚƤɏς΄֐???Ç뇳?ĵؖ?ΞЧ?? - sendto(2)的问题，ruby snmp

运行程序出错结果如下：

Errno::EADDRNOTAVAIL in AdminController#index4 
ԚƤɏς΄֐???Ç뇳?ĵؖ?ΞЧ?? - sendto(2)
RAILS_ROOT: ./script/../config/..

Application Trace | Framework Trace | Full Trace 
D:/InstantRails/ruby/lib/ruby/site_ruby/1.8/snmp/manager.rb:34:in `send'
D:/InstantRails/ruby/lib/ruby/site_ruby/1.8/snmp/manager.rb:34:in `send'
D:/InstantRails/ruby/lib/ruby/site_ruby/1.8/snmp/manager.rb:478:in `send_request'
D:/InstantRails/ruby/lib/ruby/site_ruby/1.8/snmp/manager.rb:462:in `try_request'
D:/InstantRails/ruby/lib/ruby/site_ruby/1.8/snmp/manager.rb:461:in `times'
D:/InstantRails/ruby/lib/ruby/site_ruby/1.8/snmp/manager.rb:461:in `try_request'
D:/InstantRails/ruby/lib/ruby/site_ruby/1.8/snmp/manager.rb:205:in `get'
D:/InstantRails/ruby/lib/ruby/site_ruby/1.8/snmp/manager.rb:226:in `get_value'
C:/Documents and Settings/Administrator/My Documents/NetBeansProjects/RubyGoOn/RubyGoOn/app/models/modem.rb:63:in `getmac'
C:/Documents and Settings/Administrator/My Documents/NetBeansProjects/RubyGoOn/RubyGoOn/app/models/modem.rb:62:in `getmac'
C:/Documents and Settings/Administrator/My Documents/NetBeansProjects/RubyGoOn/RubyGoOn/app/controllers/admin_controller.rb:20:in `index4'
C:/Documents and Settings/Administrator/My Documents/NetBeansProjects/RubyGoOn/RubyGoOn/app/controllers/admin_controller.rb:20:in `collect!'
C:/Documents and Settings/Administrator/My Documents/NetBeansProjects/RubyGoOn/RubyGoOn/app/controllers/admin_controller.rb:20:in `index4'

其实是因为snmp的manager在执行对modem的snmpget的时候出错了。
因为在读取modem信息的时候，应该注意有三种情况：

1，cmts头端里面根本没有这个Modem的注册信息，就是说Modem可能从来没注册过，或者已经给注销了。只要注册过的modem都会留有一个ID。
2，modem注册过，也就是合法的，但是不在线。
3，modem在线。

对于以上三种情况，第一种会导致返回错误信息，也许是noinstarnt啊之类的，需要进行判定，否则会出错。

D:/InstantRails/ruby/lib/ruby/site_ruby/1.8/snmp/manager.rb:34:in `send'

针对第一第二种，可以采用直接给记录赋值（全部都是‘0’）然后return，跳出方法，进行下一个modem的snmpget。