Re: [User-mode-linux-user] FeedBack on latest kernel

[James M. <mac...@ED...>]

On Wed, 4 Oct 2000, Jeff Dike wrote:

> mac...@ED... said:
> > > Does the shell act like it sees the missing characters?
> > I do not understand.
> If you type "abcdef" and see "abdf" on the screen, does bash say "abcdef: 
> command not found" or "abdf: command not found"?

It would be command not found... if it even acknowledges the enter ;). It
makes logging in a very challenging experience :).
 
> > I even tried the tap0 approach. tcpdump on the physical sees the
> > traffic but the physical kernel/TCP/IP does not apply, act on it.
> I'd suspect something's going on with UML, but if traffic is disappearing into 
> the host networking and disappearing, that doesn't give me much to go on.

Agreed. And the fact that it works differently on a different machine
is odd. 2 of the 3 machines at work were Mandrake installs, but one was
RedHat like here at home, so I can't even suggest that :(.

How can tcpdump see it, but the kernel not? I can understand it on
interfaces where you inject it after the TCP/IP stack where only the
wire/tapX gets to deal with it, but since it was working at work I don't
see how it works differently here.

I remember something in the tap devices where if you ran tcpdump on the
tap, the data did not go any further than to see it on tcpdump, then if
you stopped tcpdump, it would then go properly. I believe somebody added
something about copying some struct in the kernel for each thing using the
tap so that they all got to react and not just the first one in line.
Likely not related, but mentioned anyhow :).

cheers,
JES
--
James B. MacLean        mac...@ed...
Department of Education http://www.ednet.ns.ca/~macleajb
Nova Scotia, Canada
B3M 4B2