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Hi Jonathan,

The openvswitch-agent is out of sync on compute 4, try restarting it.



> On Nov 8, 2016, at 17:43, Jonathan Proulx <jon at csail.mit.edu> wrote:
> 
> 
> I have an odd issue that seems to just be affecting one private
> network for one tenant, though I saw a similar thing on a different
> project network recently which I 'fixed' by rebooting the hypervisor.
> Since this has now (maybe) happened twice I figure I should try to
> understand what it is.
> 
> Given the following four VMs on 4 different hypervisors
> 
> vm1 on Hypervisor1
> vm2 on Hypervisor2
> vm3 on Hypervisor3
> -------------------
> vm4 on Hypervisor4
> 
> 
> vm1 -> vm3 talk fine among themselves but none to 4
> 
> examining ping traffic transiting from vm1-vm4 I can see arp requests
> and responses at vm4 and GRE encapsulated ARP responses on
> Hypervisor1's physical interface.
> 
> They look the same to me (same ecap id) coming in as the working vms
> traffic, but they never make it to the qvo device which is before
> iptables sec_group rules are applied at the tap device.
> 
> attempting to tare down and recreate this resuls in the same first 3
> work last one doesn't split (possibly becuase scheduler puts them in
> the same place? haven't checked) 
> 
> ovs-vsctl -- set Bridge br-int mirrors=@m  -- --id=@snooper2 get Port snooper2  -- --id=@gre-801e0347 get Port gre-801e0347 -- --id=@m create Mirror name=mymirror select-dst-port=@gre-801e0347 select-src-port=@gre-801e0347 output-port=@snooper2
> 
> tcpdump -i snooper2 
> 
> Only sees ARP requests but no response, what's broken if I can see GRE
> encap ARP responses on physical interface but not on gre-<hex>
> interface?  And why is it not broken for all tunnels endpoints?
> 
> Oddly if I boot a 5th VM on a 5th hypervisor it can talk to 4 but not 1-3 ...
> 
> hypervisors are Ubuntu 14.04 running Mitaka from cloud archive w/
> xenial-lts kernels (4.4.0)
> 
> -Jon
> 
> -- 
> 
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