2.1.5 Configuration of Solaris kernels

For Solaris 8 (SunOS 5.8) and higher, the tun driver may or may not be included in the default kernel configuration. If it isn’t, the source can be downloaded from http://vtun.sourceforge.net/tun/. For x86 and sparc64 architectures, precompiled versions can be found at https://www.monkey.org/~dugsong/fragroute/. If the net/if_tun.h header file is missing, install it from the source package.