>I am compiling generic kernel with ...
>pseudo-device   gif             4
>... but I can't see it at ifconfig.

man gif says:

     To use gif, the administrator must first create the interface and then
     configure protocol and addresses used for the outer header.  This can be
     done by using ifconfig(8) `create' and `tunnel' subcommands, or
     SIOCIFCREATE and SIOCSIFPHYADDR ioctls.

check the output of ifconfig -C to see all configured cloning
interfaces.

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