ifdown not happening

ifdown not happening

[Grahame Jordan]

Hi,

I am trying to understand how the udev system works and track down this 
issue on Debian/ubuntu flavors.
In this case he interfaces are setup as static to remove any blame from 
dhclient.
This bug: 
https://bugs.beta.launchpad.net/ubuntu/+source/dhcp3/+bug/38140 is 
probably a symptom of this issue.

With a hotplug network interface such as usb0,  it seems that upon 
removal "ifdown usb0" does not happen.
The interface seems to go down OK but when it is plugged back in the 
interface does not come up correctly.
"ifconfig" shows lo and eth0 but not usb0
"ifconfig usb0" shows usb0 with no IP Address
If i do an ifdown usb0; ifup usb0; then everything works.

If I pull out the USB cable and then do an "ifdown usb0" I get an error 
but when I plug bak in the USB cable it comes up OK. So it seeems 
something is still holding on to usb0 after removal.

I need help to debug this issue. Any help appreciated.

Thanks


Grahame Jordan


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Re: ifdown not happening

[Grahame Jordan]

Hi,

strace on "ifdown usb0" shows that there is still an entry in 
/var/run/network/ifstate. If I manually remove the usb0=usb0 entry it 
seems to work.

Cheers

Grahame

Grahame Jordan wrote:
> Hi,
>
> I am trying to understand how the udev system works and track down this 
> issue on Debian/ubuntu flavors.
> In this case he interfaces are setup as static to remove any blame from 
> dhclient.
> This bug: 
> https://bugs.beta.launchpad.net/ubuntu/+source/dhcp3/+bug/38140 is 
> probably a symptom of this issue.
>
> With a hotplug network interface such as usb0,  it seems that upon 
> removal "ifdown usb0" does not happen.
> The interface seems to go down OK but when it is plugged back in the 
> interface does not come up correctly.
> "ifconfig" shows lo and eth0 but not usb0
> "ifconfig usb0" shows usb0 with no IP Address
> If i do an ifdown usb0; ifup usb0; then everything works.
>
> If I pull out the USB cable and then do an "ifdown usb0" I get an error 
> but when I plug bak in the USB cable it comes up OK. So it seeems 
> something is still holding on to usb0 after removal.
>
> I need help to debug this issue. Any help appreciated.
>
> Thanks
>
>
> Grahame Jordan
>
>
> -------------------------------------------------------------------------
> This SF.net email is sponsored by DB2 Express
> Download DB2 Express C - the FREE version of DB2 express and take
> control of your XML. No limits. Just data. Click to get it now.
> http://sourceforge.net/powerbar/db2/
> _______________________________________________
> Linux-hotplug-devel mailing list  http://linux-hotplug.sourceforge.net
> Linux-hotplug-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/linux-hotplug-devel
>
>   


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Download DB2 Express C - the FREE version of DB2 express and take
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Linux-hotplug-devel@lists.sourceforge.net
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