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added example config

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wireguard/DOCS.md
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@ -202,10 +202,37 @@ IP range would be `192.168.0.0`. Suffix `/24` is a way of subnet mask
specifying in CIDR, and usually you should not be worried by this.
**Hint**
If you would like to access more than your HomeAssistant device, you can just
additional `iptables` commands before this command:
- `iptables -A FORWARD -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT;`
Finally your yaml `post_up` section may look like:
```yaml
post_up: >-
iptables -A FORWARD -i %i -d <internal-ip-address-of-your-HomeAssistant-instance> -j ACCEPT;
iptables -A FORWARD -i %i -d <internal-ip-address-of-any-additional-lan-device> -j ACCEPT;
iptables -A FORWARD -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT;
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE;
iptables -A FORWARD -i %i -o %o -j ACCEPT;
iptables -A FORWARD -i %i -d <LAN-IP-ADDRESS>/24 -j DROP
```
Example config of `post_up` section, with two LAN devices accessible:
```yaml
host: myautomatedhome.duckdns.org
addresses:
- 172.27.66.1
dns: []
post_up: >-
iptables -A FORWARD -i %i -d 192.168.0.13 -j ACCEPT;
iptables -A FORWARD -i %i -d 192.168.0.37 -j ACCEPT;
iptables -A FORWARD -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT;
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE;
iptables -A FORWARD -i %i -o %o -j ACCEPT;
iptables -A FORWARD -i %i -d 192.168.0.0/24 -j DROP
```
### Option: `server.post_down` _(optional)_
Allows you to run commands after WireGuard has been stopped. This is useful