[libvirt-users] Dump network traffic from each VM.
Hi guys, Does anybody know how to dump the network trafic from each virtual machine using libvirt? Here, we usually use VPN softwares and other network tools inside Virtual Machines (Windows and Linux). Sometimes, this applications does not work properly, so we need to dump the network traffic of each Virtual Machine to compare and debug. How can I enable it using libvirt? I know that if you use a QEMU instance, you can enable the dump using "-netdev dump,...". Thanks! :-) Julio Cesar Faracco
On Wed, May 04, 2016 at 12:37:14PM -0300, Julio Faracco wrote:
Hi guys,
Does anybody know how to dump the network trafic from each virtual machine using libvirt?
Here, we usually use VPN softwares and other network tools inside Virtual Machines (Windows and Linux). Sometimes, this applications does not work properly, so we need to dump the network traffic of each Virtual Machine to compare and debug.
How can I enable it using libvirt? I know that if you use a QEMU instance, you can enable the dump using "-netdev dump,...".
Libvirt does not support the QEMU netdev dump feature at this time. Best bet is to just connect tcpdump to the TAP device associated with the virtual machine in question. See the XML config for the name of the currently assigned TAP device Regards, Daniel -- |: http://berrange.com -o- http://www.flickr.com/photos/dberrange/ :| |: http://libvirt.org -o- http://virt-manager.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: http://entangle-photo.org -o- http://live.gnome.org/gtk-vnc :|
Hi Daniel, I changed the libvirt code to support "-net dump" because it is more comfortable to me and to users here. I don't know if it is interesting to the community, but... most of the code is ready if someone needs. Julio Cesar Faracco 2016-05-05 10:34 GMT-03:00 Daniel P. Berrange <berrange@redhat.com>:
On Wed, May 04, 2016 at 12:37:14PM -0300, Julio Faracco wrote:
Hi guys,
Does anybody know how to dump the network trafic from each virtual machine using libvirt?
Here, we usually use VPN softwares and other network tools inside Virtual Machines (Windows and Linux). Sometimes, this applications does not work properly, so we need to dump the network traffic of each Virtual Machine to compare and debug.
How can I enable it using libvirt? I know that if you use a QEMU instance, you can enable the dump using "-netdev dump,...".
Libvirt does not support the QEMU netdev dump feature at this time.
Best bet is to just connect tcpdump to the TAP device associated with the virtual machine in question. See the XML config for the name of the currently assigned TAP device
Regards, Daniel -- |: http://berrange.com -o- http://www.flickr.com/photos/dberrange/ :| |: http://libvirt.org -o- http://virt-manager.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: http://entangle-photo.org -o- http://live.gnome.org/gtk-vnc :|
On Thu, May 12, 2016 at 11:32:00AM -0300, Julio Faracco wrote:
Hi Daniel,
I changed the libvirt code to support "-net dump" because it is more comfortable to me and to users here.
I don't know if it is interesting to the community, but... most of the code is ready if someone needs.
Sure, we're always happy to receive patches if you want to polish it off for submission Regards, Daniel -- |: http://berrange.com -o- http://www.flickr.com/photos/dberrange/ :| |: http://libvirt.org -o- http://virt-manager.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: http://entangle-photo.org -o- http://live.gnome.org/gtk-vnc :|
Thanks Daniel! I will clean up the trash and submit a patch or a RFC soon. Julio Cesar Faracco 2016-05-12 12:59 GMT-03:00 Daniel P. Berrange <berrange@redhat.com>:
On Thu, May 12, 2016 at 11:32:00AM -0300, Julio Faracco wrote:
Hi Daniel,
I changed the libvirt code to support "-net dump" because it is more comfortable to me and to users here.
I don't know if it is interesting to the community, but... most of the code is ready if someone needs.
Sure, we're always happy to receive patches if you want to polish it off for submission
Regards, Daniel -- |: http://berrange.com -o- http://www.flickr.com/photos/dberrange/ :| |: http://libvirt.org -o- http://virt-manager.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: http://entangle-photo.org -o- http://live.gnome.org/gtk-vnc :|
participants (2)
-
Daniel P. Berrange -
Julio Faracco