code: func (h *Handle) NeighProxyList(linkIndex, family int) ([]Neigh, error) {
  	return h.NeighListExecute(Ndmsg{
  		Family: uint8(family),
  		Index:  uint32(linkIndex),
  		Flags:  NTF_PROXY,
  	})
  }
docs: // NeighProxyList returns a list of neighbor proxies in the system.
  // Equivalent to: `ip neighbor show proxy`.
  // The list can be filtered by link, ip family.