# gre-on-wg

Create a GRETAP mesh network on top of wireguard.

## Usage

`gre-on-wg WG_QUICK_CONFIG_FILE ADDRESS_TRANSLATIONS`

The first argument is the path to a wg-quick config file, while the
second argument provides address translations for wireguard internal ip
addresses to the new addresses.

The wireguard configuration must have the `Address` config in the
`[Interface]` section set to exactly **one** address, similarly every
`[Peer]` section may only contain **one** AllowedIPs entry with **one**
addresss.

The translation file should contain lines of the following format:
`<wireguard private ip> <space> <new bridge network ip>`

### Example

Consider the following wg0.conf file

```
[Interface]
Address = 192.168.3.100/24

[Peer]
AllowedIPs = 192.168.3.101/32

[Peer]
AllowedIPs = 192.168.3.102/32

[Peer]
AllowedIPs = 192.168.3.103/32
```

And the following translation file

```
192.168.3.100/24 192.168.4.100/24
192.168.3.101/24 192.168.4.101/24
192.168.3.102/24 192.168.4.102/24
192.168.3.103/24 192.168.4.103/24
```

This would result in the creation of the bridge network `wg0br1` on host
`192.168.3.100` where the different peers have the addresses
`192.168.4.10[0123]`. Additionally the point-to-point networks
`wg0gre[1234]` would be created.