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configuration.md: mention firewall for MulticastInterfaces

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Mikaela Suomalainen 2018-12-19 11:14:15 +02:00
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@ -222,6 +222,7 @@ Note that any field not specified in the configuration will use its default valu
- A list of regex strings for matching which interfaces to enable multicast peer discovery on. Interfaces that don't match any of the provided regexes are ignored.
- The default value (`.*`) matches all interfaces.
- This is also useful if you want to prevent accidental peering over a layer 2 VPN running on top of Yggdrasil.
- These interfaces will be listened on UDP port 9001 which needs to be opened in firewall. For example with UFW: `ufw allow from fe80::/10 to any port 9001 proto udp`
- `IfName`
- The name of the `tun` or `tap` network interface to create or use. Applications send packets over this interface to use the network.
- On most platforms, an empty string or the default `"auto"` will create a new interface automatically.