问题：         
  为什么在上网监控中发现大量的ICMP会话，全是上传为1，下载为0的？
192.168.0.101是网吧收费/公安监控服务器
第三个记录的外网IP我查了
 128.0.7.244查询结果：美国
 0.3.135.217 查询结果1、Internet保留地址；
             查询结果2、IANA保留地址。
是什么在发这两个IP？？？
以下是三个记录
(一)
21:30:38 NAT exceeded 192.168.0.101
21:30:32 NAT exceeded 192.168.0.101
21:30:29 NAT exceeded 192.168.0.101
21:30:25 NAT exceeded 192.168.0.101
21:30:21 NAT exceeded 192.168.0.101
21:30:17 NAT exceeded 192.168.0.101
21:30:13 NAT exceeded 192.168.0.101
21:30:09 NAT exceeded 192.168.0.101
21:30:05 NAT exceeded 192.168.0.101
21:30:01 NAT exceeded 192.168.0.101
21:29:57 NAT exceeded 192.168.0.101
21:29:53 NAT exceeded 192.168.0.101
21:29:49 NAT exceeded 192.168.0.101
21:29:45 NAT exceeded 192.168.0.101
21:29:41 NAT exceeded 192.168.0.101
21:29:37 NAT exceeded 192.168.0.101
21:29:33 NAT exceeded 192.168.0.101
21:29:29 NAT exceeded 192.168.0.101
21:29:25 NAT exceeded 192.168.0.101
21:29:21 NAT exceeded 192.168.0.101
21:29:17 NAT exceeded 192.168.0.101
21:29:13 NAT exceeded 192.168.0.101
21:29:09 NAT exceeded 192.168.0.101
21:29:05 NAT exceeded 192.168.0.101
21:29:01 NAT exceeded 192.168.0.101
21:28:57 NAT exceeded 192.168.0.101
21:28:53 NAT exceeded 192.168.0.101
21:28:49 NAT exceeded 192.168.0.101
21:28:45 NAT exceeded 192.168.0.101
21:28:41 NAT exceeded 192.168.0.101
21:28:37 NAT exceeded 192.168.0.101
21:28:33 NAT exceeded 192.168.0

(二)
IP地址 当前连接数 超限次数
192.168.0.101 231 701976
192.168.0.110 87 198491

(三)
ID 内网地址 内网端口 协议 外网地址 外网端口 上传包 下载包 NAT地址 NAT端口
661 192.168.0.101 0 I 128.0.7.244 82 1 0 61.174.209.82 82
662 192.168.0.101 0 I 0.3.135.217 81 1 0 61.174.209.82 81
663 192.168.0.101 0 I 128.0.7.245 59 1 0 61.174.209.82 59
664 192.168.0.101 0 I 0.3.135.218 58 1 0 61.174.209.82 58
665 192.168.0.101 0 I 128.0.7.246 49 1 0 61.174.209.82 49
666 192.168.0.101 0 I 0.3.135.219 48 1 0 61.174.209.82 48
667 192.168.0.101 0 I 128.0.7.247 45 1 0 61.174.209.82 45
668 192.168.0.101 0 I 0.3.135.220 44 1 0 61.174.209.82 44
669 192.168.0.101 0 I 128.0.7.248 43 1 0 61.174.209.82 43
670 192.168.0.101 0 I 0.3.135.221 36 1 0 61.174.209.82 36
671 192.168.0.101 0 I 128.0.7.249 35 1 0 61.174.209.82 35
672 192.168.0.101 0 I 0.3.135.222 24 1 0 61.174.209.82 24
673 192.168.0.101 0 I 128.0.7.250 23 1 0 61.174.209.82 23
674 192.168.0.101 0 I 0.3.135.223 16 1 0 61.174.209.82 16
675 192.168.0.101 0 I 128.0.7.251 15 1 0 61.174.209.82 15
676 192.168.0.101 0 I 0.3.135.224 13 1 0 61.174.209.82 13
677 192.168.0.101 0 I 128.0.7.252 51544 1 0 61.174.209.82 51544
678 192.168.0.101 0 I 0.3.135.225 49268 1 0 61.174.209.82 49268
679 192.168.0.101 0 I 128.0.7.253 49267 1 0 61.174.209.82 49267
680 192.168.0.101 0 I 0.3.135.226 49266 1 0 61.174.209.82 49266
 
解答：
这些记录，所有协议都是ICMP（用大写的I代表），外部端口按顺序递增，会话的上传包为1，下载包为0，是典型的 “有去无回”的DOS攻击行为。