Open Stack

Since you are using vxlan tunnel, have you increased the MTU on all 
compute nodes and network node to accommodate the vxlan tunnel packets?

http://docs.openstack.org/juno/config-reference/content/networking-options-plugins-ml2.html

On 07/08/2015 05:41 PM, Martinx - ジェームズ wrote:
> Guys,
>
>  What can cause packets to just disappear after arriving the bridge 
> "brqxxxxzzzz-yy" ???
>
>  I'm using "VLAN Provider Networks", Juno on top of Trusty.
>
>  With Neutron ML2 + LinuxBridges, setup "all-in-one".
>
>
> Where:
>
>  - eth0 is the default - api, etc;
>  - eth1 is the "external" - floating ip, etc;
>  - eth2 is the physical vlan mapped into ML2;
>  - eth3 is another physical vlan mapped into ML2;
>  - dummy0 is being used by ML2 for VXLAN.
>
>
> Explaining:
>
>
>  * I can see the tagged packets arriving at "eth3", by using "tcpdump 
> -eni eth2 | grep "vlan 666";
>
>  * I can see the untagged packets arriving at "brq50b13311-fa", by 
> using "tcpdump -eni brq50b13311-fa";
>
>  * I CAN NOT see the untagged packets arriving at "tap9a546be0-d6", by 
> using "tcpdump -eni tap9a546be0-d6"!
>
>
>  "tcpdump -eni tap9a546be0-d6" only shows "alien" packets for this 
> "tap", like this:
>
>  - While what is arriving at "brq50b13311-fa" looks completely different!
>
>  For example, I can not see the string "Cisco" while running "tcpdump 
> -eni brq50b13311-fa | grep -i cisco", so, where those packets come 
> from (that I'm seeing on tap9a546be0-d6 and within its instance - 
> pastebin above) ???
>
>
> Instance details:
> ---
> ...
>     <interface type='bridge'>
>       <mac address='fa:16:3e:51:16:60'/>
>       <source bridge='brq50b13311-fa'/>
>       <target dev='tap9a546be0-d6'/>
>       <model type='e1000'/>
>       <address type='pci' domain='0x0000' bus='0x00' slot='0x06' 
> function='0x0'/>
>     </interface>
> ...
> ---
>
> "brctl show" returns:
>
> ---
> bridge name            bridge id                   STP enabled     
> interfaces
> ....
> brq50b13311-fa          8000.ecf4bbd0417b           no                 
>      eth3.666
>                                  tap9a546be0-d6
> ....
> ---
>
> "neutron net-show XXX" returns:
>
> http://paste.openstack.org/show/356845/
>
> -
>
> ML2 configuration contains:
>
>
>
> -
>
>  Can someone please, tell me, why ~99.5% of the packets are 
> disappearing out of nothing?
>
>  What is driving me crazy is that, on top of this very same setup 
> (including e1000 driver), but with different vlan tag, it works!
>
>  I already disabled "rp_filter", ebtables, arptables, iptables, also, 
> all files under "/proc/sys/net/bridge" have "0"...
>
>  I really appreciate any help! I'm working on this for about 16 hours 
> straight...
>
> Thanks,
> Thiago
>
>
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