.Sh DESCRIPTION
The
.Nm
-interface is a generic tunnelling pseudo device for IPv4 and IPv6.
+interface is a generic tunneling pseudo device for IPv4 and IPv6.
It can tunnel IPv[46] traffic over IPv[46].
Therefore, there can be four possible configurations.
The behavior of
device first appeared in WIDE hydrangea IPv6 kit.
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.Sh BUGS
-There are many tunnelling protocol specifications,
+There are many tunneling protocol specifications,
defined differently from each other.
.Nm
may not interoperate with peers which are based on different specifications,