Editing Teredo tunneling (section)

=== Node types ===
Teredo defines several different kinds of nodes:<ref>{{Cite journal|last1=Sharma|first1=Vishal|last2=Kumar|first2=Rajesh|date=2017|title=Teredo tunneling-based secure transmission between UAVs and ground ad hoc networks|journal=International Journal of Communication Systems|language=en|volume=30|issue=7|pages=e3144|doi=10.1002/dac.3144|s2cid=5263153 |issn=1099-1131}}</ref>

; Teredo client: A host that has IPv4 connectivity to the Internet from behind a NAT and uses the Teredo tunneling protocol to access the IPv6 Internet. Teredo clients are assigned an IPv6 address that starts with the Teredo prefix (<code>2001::/32</code>).<ref>{{cite web|title=Teredo Addresses (Windows)|url=http://msdn.microsoft.com/en-us/library/windows/desktop/cc136764(v=vs.85).aspx|website=msdn.microsoft.com|language=en|access-date=2014-12-02|archive-date=2016-12-23|archive-url=https://web.archive.org/web/20161223065016/https://msdn.microsoft.com/en-us/library/windows/desktop/cc136764(v=vs.85).aspx|url-status=live}}</ref>

; Teredo server: A well-known host used for initial configuration of a Teredo tunnel. A Teredo server never forwards any traffic for the client (apart from IPv6 pings), and has therefore  modest bandwidth requirements (a few hundred bits per second per client at most),{{Citation needed|date=March 2009}} which means a single server can support many clients. Additionally, a Teredo server can be implemented in a fully [[stateless protocol|stateless]] manner, thus using the same amount of memory regardless of how many clients it supports.

; Teredo relay: The remote end of a Teredo tunnel. A Teredo relay must forward all of the data on behalf of the Teredo clients it serves, with the exception of direct Teredo client to Teredo client exchanges. Therefore, a relay requires a lot of bandwidth and can only support a limited number of simultaneous clients. Each Teredo relay serves a range of IPv6 hosts (e.g. a single campus or company, an [[Internet service provider|ISP]] or a whole operator network, or even the whole [[IPv6 Internet]]); it forwards traffic between any Teredo clients and any host within said range.

; Teredo host-specific relay: A Teredo relay whose range of service is limited to the very host it runs on. As such, it has no particular bandwidth or routing requirements. A computer with a host-specific relay uses Teredo to communicate with Teredo clients, but sticks to its main IPv6 connectivity provider to reach the rest of the IPv6 Internet.