[ovs-discuss] UDP Packets not forwarded by OVS

[Advith Nagappa]

Hey Justin,

My bad, It had nothing to do with OVS!

Best Regards
Advith

On Fri, May 26, 2017 at 10:27 PM, Justin Pettit <jpettit at ovn.org> wrote:

>
> > On May 17, 2017, at 7:02 AM, Advith Nagappa <advith.nagappa at gmail.com>
> wrote:
> >
> > I have created two namespaces ns1 and ns2 and attached them to the
> ovs-tap ports (using veth pairs).
> >
> > I am able to send TCP and ICMP packets between the two namespaces.
> > eg: ip netns exec ns1 traceroute -I 10.1.1.1  && ip netns exec ns1
> traceroute -T 10.1.1.1.1
> >
> > but doing the same with UDP fails (doesn't find hops)
> > ip netns exec ns1 traceroute 10.1.1.1
> >
> >
> > I have disabled iptables and ufw (firewall).
> >
> > Also, if i add a rule for UDP specifically:
> > ovs-ofctl add-flow br0  priority=1111,dl_type=0x0800,
> nw_proto=17,nw_dst=10.1.1.1,tp_dst=9877,actions=NORMAL,
> >
> > i see that this rule is hit.(packet count increases in dump-flows), but
> forwarding is not done.
> >
> > Has anyone gone through a similar issue and come out with new wisdom to
> share? Would be be very helpful..
>
> That sounds very strange, and I don't see how OVS could be at fault.  You
> could dump the datapath flows to make sure that they're in fact forwarding
> the packets.  If they are, then it's almost certainly outside of OVS.  Have
> you checked to make sure that there are no firewall rules or other issues
> in the namespaces?  You may want to run tcpdump in various spots to see
> where the packets are getting dropped.
>
> --Justin
>
>
>
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