update README.md

Signed-off-by: Comic Chang <comicchang@gmail.com>
timothymiller · Sep 27, 2022 · cf7d5b4 · cf7d5b4
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@@ -82,6 +82,15 @@ Some ISP provided modems only allow port forwarding over IPv4 or IPv6. In this c
 "aaaa": true
 ```
 
+### Method used for getting ip address
+
+If you has multiple network interfaces, or if you are behind nat, you may need to enable alternative way to determine your IP address(es).
+
+```json
+"method": "netif",
+"interface": "ppp0"
+```
+
 ### Other values explained
 
 ```json