[ovs-discuss] GRE tunnel

[kevin parker]

Can any one please help me understand the invisible link that carries
traffic from gre0 through birdge with NIC attached.


On Thu, Dec 5, 2013 at 10:10 PM, kevin parker <kevin.parker092 at gmail.com>wrote:

> Hi All,
>          I have a working GRE connected between one kvm host ovs 1.11 and
> xenserver ovs 1.4.6
>
> I have created an *isolated* bridge and connected  virtual interface to
> isolated bridge with private ip ,and then added *gre0* port by mentioning
> remote public IP.
>
> Everything is fine, dont have any issues :)
>
> For understanding it better
>
> tried tcpdump on isolated bridge i am not able find anything other than
> ARP request
>
> *tcpdump -i isolated -n not port 22 -v*
>> tcpdump: listening on isolated, link-type EN10MB (Ethernet), capture size
>> 65535 bytes
>> 21:31:06.304223 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has
>> 10.168.122.10 tell 10.168.122.200, length 28
>
>
> so used dump-flows on ovs 1.4.6
> ovs-dpctl dump-flows isolated|grep -v 'src=22' |grep -v 'dst=22'
> in_port(3),eth(src=ae:0a:5e:8a:cc:2b,dst=52:54:00:bb:86:99),eth_type(0x0800),ipv4(src=10.168.122.200,dst=10.168.122.10,proto=1,tos=0,ttl=64,frag=no),icmp(type=8,code=0),
> packets:0, bytes:0, used:never, actions:*1*
>
> in_port(1),eth(src=52:54:00:bb:86:99,dst=ae:0a:5e:8a:cc:2b),eth_type(0x0800),ipv4(src=10.168.122.10,dst=10.168.122.200,proto=1,tos=0,ttl=64,frag=no),icmp(type=0,code=0),
> packets:0, bytes:0, used:never, actions:*3*
>
> From this if i understand correctly ovs is outputting to port 1 which is
> *gre0* with remote ip .But i don't understand
> 1.how packets go from *gre0* through bridge *kvmbr0* in which NIC is
> bridged.
> and
> 2. tcpdump not showing any packets in isolated bridge.
>
> Can some one please help me understand this better or point to some
> documentation
>
> Regards,
> kevin
>
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