Hi Chinmaya, 

Given that you’re getting packets in the listener’s rx fifo, I suspect the 
request to make it a connected listener didn’t work. We’ve had a number of 
changes in vcl/session layer so hard to say what exactly might be affecting 
your app. 

Just did an iperf udp test on master and everything seems to be fine. Maybe try 
it with your current vpp version to make sure that everything is okay or try 
running the udp iperf make test [2]

Regards,
Florin

[1] https://wiki.fd.io/view/VPP/HostStack/LDP/iperf#UDP_testing
[2] https://git.fd.io/vpp/tree/test/asf/test_vcl.py#n978

> On Jan 23, 2023, at 10:04 AM, Chinmaya Aggarwal <chinmaya.agar...@hsc.com> 
> wrote:
> 
> Hi,
> 
> We are using connected socket (setting VPPCOM_ATTR_SET_CONNECTED) but still 
> facing this issue. Has something changed between VPP v21.06 and the new 
> release for the connected udp socket?
> 
> Thanks and Regards,
> Chinmaya Agarwal. 
> 
> 

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