"set_link" monitor command

"set_link" monitor command

[Michael Jinks]

Like I said in my other network puzzlement thread, I have one KVM
guest which is working fine.  Or, it was until I tried to add a second
one, and hosed my virtual bridge.

The guest is still running, but since I restarted the bridge interface
that its NIC was attached to, it's no longer attached.  I thought that
maybe bringing its network interface down and back up again might
re-attach it to the bridge.  (Was I wrong?  Is there some other way to
change the network connections for a running guest?)

I found the "set_link" monitor command, but I can't figure out what
the link name should be.  I've tried:

(qemu) set_link eth0 up
could not find network device 'eth0'(qemu)
(qemu) set_link tap0 up
could not find network device 'tap0'(qemu)

?

Re: "set_link" monitor command

[Michael Jinks]

Another monitor command question: trying to rescue my de-networked
guest, I thought I'd try connecting to the console, but in its
monitor:

(qemu) info vnc
Server: disabled

According to the command line where I started this kvm instance, vnc
should be enabled.  Maybe it died?  Is there a way to turn it back on
again from the monitor?  I've looked but I can't find anything...



On Wed, Jul 15, 2009 at 6:30 PM, Michael Jinks<michael.jinks@gmail.com> wrote:
> Like I said in my other network puzzlement thread, I have one KVM
> guest which is working fine.  Or, it was until I tried to add a second
> one, and hosed my virtual bridge.
>
> The guest is still running, but since I restarted the bridge interface
> that its NIC was attached to, it's no longer attached.  I thought that
> maybe bringing its network interface down and back up again might
> re-attach it to the bridge.  (Was I wrong?  Is there some other way to
> change the network connections for a running guest?)
>
> I found the "set_link" monitor command, but I can't figure out what
> the link name should be.  I've tried:
>
> (qemu) set_link eth0 up
> could not find network device 'eth0'(qemu)
> (qemu) set_link tap0 up
> could not find network device 'tap0'(qemu)
>
> ?
>

Re: "set_link" monitor command

[Yaniv Kaul]

On 7/16/2009 2:30 AM, Michael Jinks wrote:
> Like I said in my other network puzzlement thread, I have one KVM
> guest which is working fine.  Or, it was until I tried to add a second
> one, and hosed my virtual bridge.
>
> The guest is still running, but since I restarted the bridge interface
> that its NIC was attached to, it's no longer attached.  I thought that
> maybe bringing its network interface down and back up again might
> re-attach it to the bridge.  (Was I wrong?  Is there some other way to
> change the network connections for a running guest?)
>
> I found the "set_link" monitor command, but I can't figure out what
> the link name should be.  I've tried:
>
> (qemu) set_link eth0 up
> could not find network device 'eth0'(qemu)
> (qemu) set_link tap0 up
> could not find network device 'tap0'(qemu)
>    
Try 'info network'
Y.
> ?
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