On Tue, 2014-02-25 at 11:12 +0000, Uwe.Poliak at amann.com wrote: > Hi, > > I have recently updated one of my systems from CentOs 6.4 to CentOS 6.5. > This systems is used as a RIPv2 routing server with quagga which is the termination point of some GRE tunnels. > > While running CentOS 6.4 I see the multicast packages arriving at the eth0 and the GRE tunnel interface. > While running under CentOs 6.5 I can see the multicast packages arriving at the eth0 but not on the GRE tunnel interface. > I am receiving and sending routes at the eth0 interface, but I am only able to send updates through the GRE tunnel not receive them. > All interfaces are multicast enabled: [snip] Between the -358 and -431 kernel releases from upstream there has been a lot of multicast weirdness going on. If you're currently running -431 try rolling back to the last -358 (or vice-versa) and rerun your tests to see if the behavior changes.