Neighbor Discovery Proxy

This project is an implementaion of RFC 4861 section 7.2.8 written in Rust.

It is similar to another project called ndppd, but it provides an extra recipe called "rewrite", which may help people build IPv6-compatible overlay networks.

usage

Usage:
  ./ndproxy [OPTIONS]

proxies your neighbor discovery messages.

Optional arguments:
  -h,--help             Show this help message and exit
  -c,--conf CONF        The location of your config file. Default:
                        ./ndproxy.toml

You can find an example of configuration file here.

extra recipe: rewrite the prefix

Let's say your network has multiple upstreams and relies on Network Prefix Translation (RFC 6296) (or NETMAP).

For instance:

        2001:db8:1::/64                  2001:db8:ffff::/64
              ↑                                  ↑        ↑
        ISP1, translated via NETMAP        ISP2, NPTv6   Other Users
              |-------- fec1:2:3:4::/64 ---------|
                              ↑
                      your local devices

To make your local devices available to both of your upstreams while not disturbing other users, you may want a config like:

[ndp]

[ndp.ISP1]
type = "forward"
proxied_prefix = "2001:db8:1::/64"
rewrite_method = "netmap"
local_prefix = "fec1:2:3:4::/64"
<redacted>

[ndp.ISP2]
type = "forward"
proxied_prefix = "2001:db8:ffff::/64"
rewrite_method = "npt"
local_prefix= "fec1:2:3:4::/64"
<redacted>

While running, ndproxy will monitor Neighobor Solicitations from both of your upstreams.

When it captures a valid NS, it will translate the Target Address of the NS to your own private address, and perform Neighbor Discovery locally.

If the requested neighbor exists, ndproxy will send a proxied Neighbor Advertisement back to the related interface.