目前发现存在问题的权威 NS,域名为
ns17.xincache.com该域名解析指向 183.181.155.227 ,IP 地址位于日本。
向该 IP 地址实际发起解析请求,无响应
高潮来了,如果将 IP 地址改为 183.131.155.227 ,杭州,反而是有正常的解析请求响应的。
测试域名,
www.yeshu.comnslookup
www.yeshu.com 183.181.155.227 ,显示结果如下:
服务器: UnKnown
Address: 183.181.155.227
DNS request timed out.
timeout was 2 seconds.
DNS request timed out.
timeout was 2 seconds.
DNS request timed out.
timeout was 2 seconds.
DNS request timed out.
timeout was 2 seconds.
*** 请求 UnKnown 超时
而如果输入为 nslookup
www.yeshu.com 183.131.155.227 ,响应如下:
服务器: UnKnown
Address: 183.131.155.227
名称:
www.yeshu.comAddress: 124.225.113.74