Zhiyong,
>> The next steps for tunnels, to help avoid fragmentation is to add some sort
>> of
>> tunnel path MTU discovery.
>
> It looks very interesting and helpful. And I'm looking forward to seeing it.
>
> However, we fail to send big packet greater than MTU now, for example,
> We have MTU = 1500, when 1500bytes packets are encapped by vxlan protocol,
> of course, the size of packets is bigger than MTU at the time ,
> it looks that sending packets fails now.
You are not master latest?
This is for IPv4 or IPv6 transport?
Take a look at the packet trace and see how that looks like?
And note that IPv4 with DF=1 or not locally originated IPv6 is not fragmented.
You can also do testing with https://gerrit.fd.io/r/#/c/14984/ included, which
fixes a problem with tracing after fragmentation.
> BTW
> Is DPDK IP fragment/reassembly supported in VPP now?
No. DPDK fragmentation uses indirect buffers which we don’t have in VPP.
Best regards,
Ole
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