Re: [ovs-discuss] ping loss of first packet with OVN l3 logical router.

[Ben Pfaff]

The issue is just the lack of packet buffering.  To fix it, we need to
implement packet buffering somehow.

On Sat, Mar 17, 2018 at 08:15:17AM +0800, Guoshuai Li wrote:
> What about add an incomplete(only ip, no mac) Mac_binding when configuring
> the route's nexthop?
> 
> Similar to the linux system：
> # arp -n
> 10.157.0.253 (incomplete) eth0
> 
> Then ovn-controller sends an arp request for this？
> 
> When this icmp is sent, the arp has already been requested.
> 
> >It's currently part of the design but it's not great for users, so it'd
> >be nice to fix it someday and I'd be pleased to hear proposals if anyone
> >wants to work on this.
> 
___
discuss mailing list
disc...@openvswitch.org
https://mail.openvswitch.org/mailman/listinfo/ovs-discuss

Re: [ovs-discuss] ping loss of first packet with OVN l3 logical router.

[Guoshuai Li]

What about add an incomplete(only ip, no mac) Mac_binding when 
configuring the route's nexthop?


Similar to the linux system：
# arp -n
10.157.0.253 (incomplete) eth0

Then ovn-controller sends an arp request for this？

When this icmp is sent, the arp has already been requested.


It's currently part of the design but it's not great for users, so it'd
be nice to fix it someday and I'd be pleased to hear proposals if anyone
wants to work on this.


___
discuss mailing list
disc...@openvswitch.org
https://mail.openvswitch.org/mailman/listinfo/ovs-discuss

Re: [ovs-discuss] ping loss of first packet with OVN l3 logical router.

[Ben Pfaff]

It's currently part of the design but it's not great for users, so it'd
be nice to fix it someday and I'd be pleased to hear proposals if anyone
wants to work on this.

On Fri, Mar 16, 2018 at 04:39:35PM +0530, Numan Siddique wrote:
> Hi Jai,
> 
> This is by design. For any IP packet which goes through the logical router
> pipeline, if OVN doesn't know the mac of next hop, it learns it by
> generating an ARP request packet replacing the original IP packet. That's
> the reason why the first ping is always dropped.
> 
> You can run "ovn-sbctl list mac_binding" and see the list of mac learnings.
> 
> Thanks
> Numan
> 
> 
> On Fri, Mar 16, 2018 at 4:17 PM, Jai Singh Rana  wrote:
> 
> > Hi All,
> >
> > I have configured OVN L3 logical router for external traffic with 3
> > host native ovs/ovn setup.When pinging from VM to external network for
> > the first time after bringing up ovn l3 router , there is ping loss of
> > first packet. Afterwards everything works fine even if pinging after
> > some interval and no packet loss is observed.
> >
> > If anyone observed this issue before or has any suggestions to rectify
> > this, it will be very helpful. I am using ovs-2.8.90.
> >
> > Setup topology, configurations and logs are as in following link:
> >
> > https://pastebin.com/RuTErpw2
> >
> > -Jai
> > ___
> > discuss mailing list
> > disc...@openvswitch.org
> > https://mail.openvswitch.org/mailman/listinfo/ovs-discuss
> >

> ___
> discuss mailing list
> disc...@openvswitch.org
> https://mail.openvswitch.org/mailman/listinfo/ovs-discuss

___
discuss mailing list
disc...@openvswitch.org
https://mail.openvswitch.org/mailman/listinfo/ovs-discuss

Re: [ovs-discuss] ping loss of first packet with OVN l3 logical router.

[Numan Siddique]

Hi Jai,

This is by design. For any IP packet which goes through the logical router
pipeline, if OVN doesn't know the mac of next hop, it learns it by
generating an ARP request packet replacing the original IP packet. That's
the reason why the first ping is always dropped.

You can run "ovn-sbctl list mac_binding" and see the list of mac learnings.

Thanks
Numan


On Fri, Mar 16, 2018 at 4:17 PM, Jai Singh Rana  wrote:

> Hi All,
>
> I have configured OVN L3 logical router for external traffic with 3
> host native ovs/ovn setup.When pinging from VM to external network for
> the first time after bringing up ovn l3 router , there is ping loss of
> first packet. Afterwards everything works fine even if pinging after
> some interval and no packet loss is observed.
>
> If anyone observed this issue before or has any suggestions to rectify
> this, it will be very helpful. I am using ovs-2.8.90.
>
> Setup topology, configurations and logs are as in following link:
>
> https://pastebin.com/RuTErpw2
>
> -Jai
> ___
> discuss mailing list
> disc...@openvswitch.org
> https://mail.openvswitch.org/mailman/listinfo/ovs-discuss
>
___
discuss mailing list
disc...@openvswitch.org
https://mail.openvswitch.org/mailman/listinfo/ovs-discuss