Re: [User-mode-linux-devel] Re: 2.3.51 Networking *smile*

[William S. <wst...@po...>]

Good morning, Jeff,

On Mon, 13 Mar 2000, Jeff Dike wrote:

> > How would it be if you used ethertap on the host and uml?  Could the
> > uml kernel connect the output of one tap to the input of the other and
> > vice-versa?
> 
> Where can I find something to read about ethertap?  Rusty also mentioned this 
> a while back, as a possible way to get rid of the um_ifconfig kludge.

	/usr/src/linux-2.3.51/Documentation/networking/ethertap.txt
	As best I understand it, it appears to the networking layer as
just another network interface that can send and receive
packets.  Anything sent out that interface can be sucked out of /dev/tap0
by a userspace program.  Anything that userspace program stuffs into
/dev/tap0 arrives at the nework layer as if it had been received on this
virtual interface.
	Rusty's netfilter package has some examples of applications that
can work with tap* and even some shell scripts used in his test suite to
show how to send and receive packets by hand from a shell script.
	http://www.samba.org/netfilter/0.90/0.90.html gets you to the
download page for the latest release; get the tar and look in the utils
and testsuite directories.
	Rusty is probably better for low level details than I.
	Cheers,
	- Bill

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