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docs: guide for external dns

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# Use External DNS
> **Note**
> DNS request should be forwarded by dae for domain based traffic split. This guide will show you how to configure dae with external DNS.
If you use a external DNS like AdguardHome, you could refer to the following guide.
## External DNS on localhost
If you set up a external DNS on localhost, you may want to let the DNS queries to dns.google proxied. For example, if you have following configuration in AdguardHome:
```
Listen on: the same machine with dae, port 53.
China mainland: udp://223.5.5.5:53
Others: https://dns.google/dns-query
```
You should configure dae as follows:
1. Complete `wan_interface` in "global" section to proxy requests of AdguardHome.
2. Insert following rule as the first line of "routing" section to avoid loops.
```python
pname(AdGuardHome) && l4proto(udp) && dport(53) -> must_direct
```
And make sure domain `dns.google` will be proxied in routing rules.
3. Add upstream and request to section "dns".
```
dns {
upstream {
adguardhome: 'udp://127.0.0.1:53'
}
request {
fallback: adguardhome
}
}
```
4. If you bind to LAN, make sure your DHCP server will distribute dae as the DNS server (DNS request should be forwarded by dae for domain based traffic split).
## External DNS on another machine in LAN
If you set up a external DNS on another machine in LAN, you may want to let the DNS queries to dns.google proxied. For example, if you have following configuration in AdguardHome:
```
Listen on: 192.168.30.3:53 (mac address: 8c:16:45:36:1c:5a)
China mainland: udp://223.5.5.5:53
Others: https://dns.google/dns-query
```
You should configure dae as follows:
1. Fill in `lan_interface` in "global" section to proxy requests of AdguardHome.
2. Insert following rule as the first line of "routing" section to avoid loops.
```python
sip(192.168.30.3) && l4proto(udp) && dport(53) -> must_direct
# Or use MAC address if in the same link:
# mac(8c:16:45:36:1c:5a) && l4proto(udp) && dport(53) -> must_direct
```
And make sure domain `dns.google` will be proxied in routing rules.
3. Add upstream and request to section "dns".
```
dns {
upstream {
adguardhome: 'udp://192.168.30.3:53'
}
request {
fallback: adguardhome
}
}
```
4. If you bind to LAN, make sure your DHCP server will distribute dae as the DNS server (DNS request should be forwarded by dae for domain based traffic split).
##
```
```