dns解析不穩定
dns伺服器解析不穩定，有時候可以，有時候DNS request timed out
> www.sina.com
Server: svr3.sd.gov.cn
Address: 19.200.2.3
Non-authoritative answer:
Name: ara.sina.com.cn
Addresses: 58.63.236.27, 58.63.236.28, 58.63.236.29, 58.63.236.30
58.63.236.31, 58.63.236.32, 58.63.236.33, 58.63.236.34, 58.63.236.35
58.63.236.36, 58.63.236.37, 58.63.236.38, 58.63.236.39, 58.63.236.49
58.63.236.50, 58.63.236.26
Aliases: www.sina.com, us.sina.com.cn, news.sina.com.cn
jupiter.sina.com.cn
> www.baidu.com
Server: svr3.sd.gov.cn
Address: 19.200.2.3
DNS request timed out.
timeout was 2 seconds.
DNS request timed out.
timeout was 2 seconds.
*** Request to svr3.sd.gov.cn timed-out
> www.sina.com
Server: svr3.sd.gov.cn
Address: 19.200.2.3
DNS request timed out.
timeout was 2 seconds.
DNS request timed out.
timeout was 2 seconds.
*** Request to svr3.sd.gov.cn timed-out
>
《解決方案》
線路不暢導致解析超時
《解決方案》
LZ多測試幾次
用tcpdump監控一下
