大佬帮看下为什么网站加上 www 后 dns 就无响应了

网站是 okx (www.okx.com), 而且目前只发现 okx 有问题，浏览器打开会秒响应 DNS_PROBE_FINISHED_NXDOMAIN。

下面是我本地的一些测试:


➜  ~ nslookup www.baidu.com
Server:		2408:8215:f29:16f0::1
Address:	2408:8215:f29:16f0::1#53

www.baidu.com	canonical name = www.a.shifen.com.
Name:	www.a.shifen.com
Address: 110.242.68.4
Name:	www.a.shifen.com
Address: 110.242.68.3

➜  ~ nslookup www.okx.com
Server:		2408:8215:f29:16f0::1
Address:	2408:8215:f29:16f0::1#53

*** Can't find www.okx.com: No answer

➜  ~ nslookup okx.com
Server:		2408:8215:f29:16f0::1
Address:	2408:8215:f29:16f0::1#53

Name:	okx.com
Address: 43.198.216.245
Name:	okx.com
Address: 16.163.134.231
Name:	okx.com
Address: 43.199.123.175

➜  ~ curl okx.com
<html>
<head><title>301 Moved Permanently</title></head>
<body>
<center><h1>301 Moved Permanently</h1></center>
</body>
</html>
➜  ~ curl https://okx.com
<html>
<head><title>301 Moved Permanently</title></head>
<body>
<center><h1>301 Moved Permanently</h1></center>
</body>
</html>
➜  ~ curl https://www.okx.com
curl: (6) Could not resolve host: www.okx.com

家里所有设备打开这个 okx 都是秒拒。

OpenWrt 作为软路由，它负责拨号上网，并且里面跑着 openclash ，dns 是 Dnsmasq 。

连接 OpenWrt 的是路由器，作为中继充当无线交换机。

我尝试过关闭 openclash ，网站还是一样打不开。

在 OpenWrt 中调试:

$ nslookup www.okx.com
Server:		127.0.0.1
Address:	127.0.0.1:53




# root @ OpenWrt in ~ [9:41:51]
$ nslookup www.baidu.com
Server:		127.0.0.1
Address:	127.0.0.1:53


www.baidu.com	canonical name = www.a.shifen.com
Name:	www.a.shifen.com
Address: 110.242.68.3
Name:	www.a.shifen.com
Address: 110.242.68.4


# root @ OpenWrt in ~ [9:42:03]
$ nslookup okx.com
Server:		127.0.0.1
Address:	127.0.0.1:53

Name:	okx.com
Address: 16.163.134.231
Name:	okx.com
Address: 43.199.123.175
Name:	okx.com
Address: 43.198.216.245

okx 只要是加上 www 后就无法获取到 ip 地址了。

另外也重启过很多次 Dnsmasq (/etc/init.d/dnsmasq restart), 都没效果。

hosts 文件也没问题:

$ cat /etc/hosts
127.0.0.1 localhost

::1     localhost ip6-localhost ip6-loopback
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters

目前来看，和 OpenClash 关系不大，因为请求就没有走到 OC 里面。

下面是配置项：

$ cat /etc/config/dhcp
config dnsmasq
	option domainneeded '1'
	option boguspriv '1'
	option filterwin2k '0'
	option localise_queries '1'
	option rebind_protection '1'
	option rebind_localhost '1'
	option local '/lan/'
	option domain 'lan'
	option expandhosts '1'
	option nonegcache '0'
	option authoritative '1'
	option readethers '1'
	option leasefile '/tmp/dhcp.leases'
	option nonwildcard '1'
	option localservice '1'
	option ednspacket_max '1232'
	option filter_aaaa '0'
	option filter_a '0'
	option localuse '1'
	option port '53'
	list server '127.0.0.1#7874'
	option noresolv '1'
	option cachesize '0'

FaiChou

125 天前

@afn988 我 dhcp 没配置这个，dnsmasq 有这个，我试过还是一样：

$ cat /etc/config/dhcp

config dnsmasq
option domainneeded '1'
option boguspriv '1'
option filterwin2k '0'
option localise_queries '1'
option rebind_protection '1'
option rebind_localhost '1'
option local '/lan/'
option domain 'lan'
option expandhosts '1'
option nonegcache '0'
option authoritative '1'
option readethers '1'
option leasefile '/tmp/dhcp.leases'
option nonwildcard '1'
option localservice '1'
option ednspacket_max '1232'
option filter_aaaa '0'
option filter_a '0'
option localuse '1'
option port '53'
list server '127.0.0.1#7874'
option noresolv '1'
option cachesize '0'

config dhcp 'lan'
option interface 'lan'
option start '100'
option limit '150'
option leasetime '12h'
option dhcpv4 'server'
option ra_slaac '1'
list ra_flags 'managed-config'
list ra_flags 'other-config'
option force '1'
option ra 'server'
option dhcpv6 'server'
option ra_management '1'

config dhcp 'wan'
option interface 'wan'
option ignore '1'