* [uml-devel] [BUG!?] Re: [uml-user] TUNSETIFF failed, errno = 16SIOCSIFFLAGS: Device or resource busy
[not found] ` <87zn73biui.fsf@amaterasu.srvr.nix>
@ 2004-06-16 16:47 ` roland
2004-06-16 21:59 ` [uml-devel] " Nix
0 siblings, 1 reply; 2+ messages in thread
From: roland @ 2004-06-16 16:47 UTC (permalink / raw)
To: Naomi Fox, Nix; +Cc: user-mode-linux-user, user-mode-linux-devel
hi!
> > When I start up my UML, the networking works fine. If I bring down my
> > interface and attempt to bring it back up again, I get the following
> > message.
> >
> > # ifconfig eth0 down
> > # ifconfig eth0 up
> > TUNSETIFF failed, errno = 16SIOCSIFFLAGS: Device or resource busy
> ... which it is: it's a component of the bridge, and doesn't have its
> own independent existence anymore.
yes - and that is why we should somewhat call it a "bug" - because a uml user indeed is allowed to bring down/up eth0, but he
(usually) isn't allowed to do something outside the uml.
so - what could he do?
call his uml provider to tell him he should fix the tun/tap/bridge for him?
no - uml should handle this itself,IMHO.
> Either bring down br0, or bring down the UML side of the link.
that is a workaround , not a solution.
i think UML needs some fix to handle tun/tap via bridge appropriately.
regards
roland
----- Original Message -----
From: "Nix" <nix@esperi.org.uk>
To: "Naomi Fox" <schpoo@Dartmouth.EDU>
Cc: <user-mode-linux-user@lists.sourceforge.net>
Sent: Wednesday, June 16, 2004 5:52 PM
Subject: Re: [uml-user] TUNSETIFF failed, errno = 16SIOCSIFFLAGS: Device or resource busy
> On Tue, 15 Jun 2004, Naomi Fox stated:
> > I am running a uml using a tuntap device connected to a bridge.
> >
> > # brctl show
> > bridge name bridge id STP enabled interfaces
> > br0 8000.000255ffc0ce no eth0
> > tap0
> >
> > When I start up my UML, the networking works fine. If I bring down my
> > interface and attempt to bring it back up again, I get the following
> > message.
> >
> > # ifconfig eth0 down
> > # ifconfig eth0 up
> > TUNSETIFF failed, errno = 16SIOCSIFFLAGS: Device or resource busy
>
> ... which it is: it's a component of the bridge, and doesn't have its
> own independent existence anymore.
>
> Either bring down br0, or bring down the UML side of the link.
>
> Example, from my startup scripts, using the brctl and ip tools instead
> of ageing ifconfig:
>
> brctl addbr adsl
> brctl stp adsl off
> brctl setfd adsl 1
> brctl sethello adsl 1
>
> brctl addif adsl adsl-phys
> brctl addif adsl tap0
>
> ip link set dev adsl mtu 1458 up
>
> --
> `We in no way believe that this Christ was a space alien.'
> --- A creationist website goes completely bonkers
>
>
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