Are you using datapath in kernel or in userspace? What's the kernel version?
If it's kernel DP, then patch ports are internal ports which during TX inserts the packet (skb) into the CPU backlog queue (enqueue_to_backlog()) for later processing. Later on, the backlog queue is processed (process_backlog()) and the packet is actually received by the other port. The above code path contains trace points which you can hook using systemtap or perf tools to see what is going on. Another approach is using 'dropwatch' tool to find out where the packet might have been dropped. I don't think it's related to TTL and I don't remember to have seen any check like that. fbl On Wed, Aug 13, 2014 at 01:23:13PM -0400, Krishna Pratap wrote: > i dont know how i didnt recevie the first email from Duy. > > this is the original query > http://openvswitch.org/pipermail/discuss/2014-August/014741.html > > > On Wed, Aug 13, 2014 at 1:15 PM, Ben Pfaff <b...@nicira.com> wrote: > > Please don't drop the list. > > > > Open vSwitch does not have such a check. > > > > On Wed, Aug 13, 2014 at 01:06:46PM -0400, Krishna Pratap wrote: > >> exactly, i have been wondering the same. do you know where this check > >> is done the code? it doesnt forward anything after 65 hops > >> > >> On Wed, Aug 13, 2014 at 1:04 PM, Ben Pfaff <b...@nicira.com> wrote: > >> > On Wed, Aug 13, 2014 at 10:02 AM, Krishna Pratap > >> > <singh.pratapkris...@gmail.com> wrote: > >> >> TTL doesnt seems to be the problem. i have considered that. anyhow if > >> >> you check the traffic in the output that i posted the TTL is set as > >> >> 255. Also i dont think TTL should matter if we are forwarding packets > >> >> at layer 2. > >> >> > >> >> I am guessing there is a check somewhere in OVS code which limits it. > >> >> if anyone can point me out where it is or suggest a workaround, it > >> >> would be great. I have not been able to find that check yet. > >> > > >> > I don't know how Open vSwitch would even know how many times a packet > >> > had been forwarded. > > > > -- > Best Regards, > Krishna Pratap Singh > _______________________________________________ > discuss mailing list > discuss@openvswitch.org > http://openvswitch.org/mailman/listinfo/discuss > _______________________________________________ discuss mailing list discuss@openvswitch.org http://openvswitch.org/mailman/listinfo/discuss
