Re: Query about Tun/Tap Modules

[Jeff Dike]

[e-mail] said:
> Q1 : Now I am not able to understand how to use this module for my
> above stated purpose.
>      If anybody has used this utility(Tun/tap) before , please let me
> know how to get these ethernet packet going towards IP layer and IP
> packets going towards ethernet driver. 

It's not clear how similar my use of TUN/TAP is to what you want, but UML uses
TUN/TAP as one mechanism to network a virtual machine to the host, and it
works quite well.

See tuntap_up() in 
http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/user-mode-linux/tools/uml_net/uml_net.c?rev=1.10&content-type=text/vnd.viewcvs-markup
for setting up a TUN/TAP interface and 
tuntap_user_read() and tuntap_user_write() (which are both trivial)
http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/user-mode-linux/linux/arch/um/drivers/tuntap_user.c?rev=1.2&content-type=text/vnd.viewcvs-markup
for getting packets in and out of the interface.

				Jeff