On Sat, Jan 31, 2015 at 03:41:13PM +0100, Philippe Gautier wrote: > I detect packet loss when I analyse GRE traffic sended by RSPAN. Is there a > default sampling parameter when configuring port mirroring ?
No, mirroring should copy all packets. > Test platform and scenario: > > Two KVM virtual hosts (port internet2, internet3) hosted on a physical host > (port br0 and eth0). Trafic is sended through the gre interface to a remote > host. The gre trafic is sended through eth0 physical interface. > > When I generate a trafic between a vm and an internet host (In my case > google server) I capture real and RSPAN trafic on eth0 interface. It looks like the first packet is getting mirrored but a number of packets after that are getting dropped, and that then after some time the mirroring picks up again. I wonder whether this is caused by ARP. I believe that one valid way to do ARP is to queue the first packet to a destination while waiting for an ARP response but drop later packets to that destination until the ARP response arrives. That would explain this behavior. So: does it help to add a static ARP entry for your tunnel destination? _______________________________________________ discuss mailing list discuss@openvswitch.org http://openvswitch.org/mailman/listinfo/discuss
