Unix: add reverse-proxy line for dns ip

src/content/unix/reverse-proxy.md

@@ -169,7 +169,7 @@ ssh -p 8022 emiliko@172.27.10.10
 
 This will be forwarded to port 22 on the server!
 
-### Reverse Proxy without a Static IP
+## Reverse Proxy without a Static IP
 
 If you're planning to use a home computer, you'll quickly find that most
 internet service providers do not offer static IPs for consumer plans. Luckily,
@@ -328,3 +328,11 @@ WantedBy=timers.target
 
 Then start it with `systemctl enable update_a_record.service`. The name of the
 service will be different based on what you called the files.
+
+Now to use this for reverse-proxy purposes, go back to your `client.toml` config
+and update the `remote_addr`:
+
+```toml
+[client]
+remote_addr = "mycomputer.example.com:9001"
+```