Re: [uml-devel] [uml-user] Promiscuous mode interface bug?

[Paolo Giarrusso <blaisorblade@yahoo.it>]

"Stephens, Allan" <allan.stephens@windriver.com> ha scritto: 

> Hi Paolo:
> 
> OK, let me take one more try at explaining what I've observed. 
> (And my
> apologies for making this whole issue more confusing than necessary
> ...
> I'm pretty inexperienced when it comes to detailing with the
> details of
> network interface operation.)
> 
> When I used "ethX=daemon", each interface I configured on a UML
> guest
> forwarded only the traffic that was destined for it to my network
> protocol software -- indicating that the uml_switch application was
> getting UML to filter things correctly.

Does it works corrently even with uml_switch -hub or not?

> When I used "ethX=mcast", each interface I configured on a UML
> guest
> forwarded all packets sent to the associated multicast group to my
> network protocol software
which I guess operates with raw sockets...
>, even though the interfaces were not
> configured as "promiscuous".

> The latter observation was the source of my original concern,
> causing me
> to ask "why doesn't UML mark the device as promiscuous if it is
> passing
> on all packets?".  Your subsequent explanations now make me think
> that I
> should have asked "why isn't UML filtering out the unwanted packets
> since the device isn't configured as promiscuous?".

> I just repeated my "ethX=mcast" testing to make sure I hadn't done
> something stupid, like configure both interfaces with the same MAC
> address, but I still see the same result.  This leads me to
> conclude
> that there is a real problem with the way UML is filtering packets
> on
> "ethX=mcast" interfaces.  Admittedly, I can circumvent this problem
> being by manually configuring the interfaces as promiscuous, but it
> still looks like a bug.

> Does this (finally) make sense?

Yes, it makes a lot of sense (in fact I'm forwarding this to
uml-devel); I have looked at the code but I don't see any really
_obvious_ difference. Everything depends on uml_switch -hub result,
which I'd like to see.

Thanks for your effort meanwhile!
Bye

Chiacchiera con i tuoi amici in tempo reale! 
 http://it.yahoo.com/mail_it/foot/*http://it.messenger.yahoo.com 

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