When I use Dokodemo-door in router, can I still use domain routing rules?

[sgon00]

In routing rules, people always have something like:

"routing": {
        "domainStrategy": "IpIfNonMatch",
        "rules": [
            {
                "type": "field",
                "outboundTag": "direct",
                "domain": [
                    "geosite:cn"
                ]
            },

But, I am very confused how it works when I use Dokodemo-door protocol in router?
Normally I will use iptables command to forward all traffics to Dokodemo-door port. But iptables only cares about IPs only. When the traffics forward to Dokodemo-door port, all traffics are IPs only from my point of view. geosite:cn domain will not take any effects. Am I wrong? How can I make domain routing rules make sense and work in a router setup?

Thanks a lot.

[om2mo]

iptables转发的是第四层TCP/UDP数据包，因此它包含了IP地址。

ex:
iptables  -p udp -dport 53 to 1234
dig qq.com

iptables会将查询qq.com的 dns udp 包发往1234，dns udp = src ip/port, dst ip/port, domain name.

进入dokodemo port可以是域名和IP，这取决于你的需求，所以geosite策略是有效的。