我有OSX 10.9.2。有一天，我的互联网开始停滞不前。
之前未检测到系统更新。
当我尝试发送ping时 http://stackoverflow.com/ 我有：
64 bytes from 198.252.206.140: icmp_seq=54 ttl=47 time=297.871 ms
Request timeout for icmp_seq 55
Request timeout for icmp_seq 56
Request timeout for icmp_seq 57
Request timeout for icmp_seq 58
64 bytes from 198.252.206.140: icmp_seq=59 ttl=47 time=149.727 ms
64 bytes from 198.252.206.140: icmp_seq=60 ttl=47 time=147.736 ms
64 bytes from 198.252.206.140: icmp_seq=61 ttl=47 time=160.763 ms
64 bytes from 198.252.206.140: icmp_seq=62 ttl=47 time=148.458 ms
Request timeout for icmp_seq 63
Request timeout for icmp_seq 64
Request timeout for icmp_seq 65
64 bytes from 198.252.206.140: icmp_seq=66 ttl=47 time=147.925 ms
Request timeout for icmp_seq 67
Request timeout for icmp_seq 68
Request timeout for icmp_seq 69
Request timeout for icmp_seq 70
Request timeout for icmp_seq 71
Request timeout for icmp_seq 72
Request timeout for icmp_seq 73
Request timeout for icmp_seq 74
Request timeout for icmp_seq 75
64 bytes from 198.252.206.140: icmp_seq=76 ttl=47 time=160.432 ms
64 bytes from 198.252.206.140: icmp_seq=77 ttl=47 time=168.872 ms
64 bytes from 198.252.206.140: icmp_seq=78 ttl=47 time=160.564 ms
Request timeout for icmp_seq 79
Request timeout for icmp_seq 80
64 bytes from 198.252.206.140: icmp_seq=81 ttl=47 time=169.759 ms
Request timeout for icmp_seq 82
Request timeout for icmp_seq 83
Request timeout for icmp_seq 84
Request timeout for icmp_seq 85
Request timeout for icmp_seq 86
Request timeout for icmp_seq 87
Request timeout for icmp_seq 88
Request timeout for icmp_seq 89
64 bytes from 198.252.206.140: icmp_seq=90 ttl=47 time=241.351 ms
Request timeout for icmp_seq 91
Request timeout for icmp_seq 92
64 bytes from 198.252.206.140: icmp_seq=93 ttl=47 time=156.303 ms
Request timeout for icmp_seq 94
Request timeout for icmp_seq 95
但是ping到 8.8.8.8 运作良好（0.2％损失）
到目前为止我做了什么：
- 重启MAC
- 重启路由器
- 其他PC Windows 7工作正常
- 用iPhone创建热点并使用移动数据 - 也有同样的损失
听起来像OSX有DNS问题。
在OSX中，我需要从哪里开始调查这个问题？
[编辑]
我的DNS设置如下：
谢谢，