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ejin楼主说的是 ISP 的 DNS 服务器,把不存在的域名,本来按标准应该返回 NXDOMAIN 的,全部解析到它自己的一台广告服务器的 IP 上面去了……
其实不光 ISP,很多 DNS 服务器都喜欢干这事……
我现在是本地用 dnsmasq,它里面有这样的配置项专治这种 upstream DNS server:
# If you want dnsmasq to detect attempts by Verisign to send queries
# to unregistered .com and .net hosts to its sitefinder service and
# have dnsmasq instead return the correct NXDOMAIN response, uncomment
# this line. You can add similar lines to do the same for other
# registries which have implemented wildcard A records.
#bogus-nxdomain=64.94.110.11