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add PreDown and PostDown config reference
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README.md
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README.md
@ -511,12 +511,17 @@ dig example.com A
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**Jump to definition:**
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¶ <a href="#Interface">`[Inteface]`</a>
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¶ <a href="#-Name">`# Name = node1.example.tld`</a>
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¶ <a href="#Address">`Address = 10.0.0.3/32`</a>
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¶ <a href="#ListenPort">`ListenPort = 51820`</a>
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¶ <a href="#PrivateKey">`PrivateKey = localPrivateKeyAbcAbcAbc=`</a>
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¶ <a href="#DNS">`DNS = 1.1.1.1,8.8.8.8`</a>
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¶ <a href="#PreUp">`PreUp = /bin/example arg1 arg2 %i`</a>
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¶ <a href="#PostUp">`PostUp = /bin/example arg1 arg2 %i`</a>
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¶ <a href="#PreDown">`PreDown = /bin/example arg1 arg2 %i`</a>
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¶ <a href="#PostDown">`PostDown = /bin/example arg1 arg2 %i`</a>
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¶ <a href="#Peer-">`[Peer]`</a>
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@ -637,6 +642,18 @@ Optionally run a command after the interface is brought up.
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* Add an iptables rule to enable packet forwarding on the WireGuard interface
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`PostUp = iptables -A FORWARD -i %i -j ACCEPT; iptables -A FORWARD -o %i -j ACCEPT; iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE`
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#### `PreDown`
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Optionally run a command before the interface is brought down.
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**Examples**
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* Log a line to a file
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`PostDown = echo "$(date +%s) WireGuard Going Down" >> /var/log/wireguard.log`
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* Hit a webhook on another server
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`PostDown = curl https://events.example.dev/wireguard/stopping/?key=abcdefg`
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#### `PostDown`
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