Update – May 2019 Windows 10 version 1903 has now been released and allows an important update to WSL that allows Windows applications and tools to access Linux files directly. To do this, WSL hosts a new 9P fileserver, which exposes distro filesystems to Windows apps and tools via \\wsl$\<DistroName>\!
Along with support for ifconfig & network connection enumeration, Windows 10 Insider Build 14965 delivers a small but important change was made which will enable you more easily invoke Windows tools & applications from within Bash:
Your Windows user environment path is now appended to the WSL path by default.
Enable network connection enumeration is currently the most-requested idea in our command-line User Voice. Or at least it was, until Windows 10 Insider build #14965 was released, which support for network connection enumeration: