An NDP proxy daemon, inspired by ndppd.
Many VPS providers will give you an IPv6 subnet but rather than being routed, it is put 'on link'. This makes it hard to use IPv6 for things like Docker. An NDP proxy solves this problem by 'bridging' the Docker network with the outside network. You could bridge the two networks at an ethernet layer, however many VPS providers also filter traffic based on source MAC address, so packets that are not originating from your VPS's MAC will be dropped. An NDP proxy solves that problem too as all packets will have the VPS's 'outside' interface MAC address (rather than the MAC assigned of the originating container).
Written as a learning exercise. It works, but shouldn't be relied on.
Pull requests welcome!
Download a precompiled binary for Linux form the releases page, or compile yourself.
$ ./endyp -c config.toml
The config file is similar to ndppd e.g.
[interfaces.eth0]
rules = ["dead:beef:1::9c3:0:0/104"]
eth0 is the proxy interface and will forward traffic to the interface matching the IP network listed in rules. So, for example, I may have a static route sending dead:beef:1::9c3:0:0/104 to Docker's docker0 interface. In this case, NDP will be proxied between eth0 and docker0.