TCPDump on vEdge doesn't capture traffic

[maverick0]

Hi Guys

I am troubleshooting NTP connectivity and a sync failure using TCPDUMP. When I run the tcpdump interface X/X options "dst ip X.X.X.X" or tcpdump vpn X options "dst ip X.X.X.X", I don't see any traffic being sent out to the NTP Server. The TCPDUMP is listening, but it doesn't capture any traffic. The SD-WAN Controllers and vEdge are running the software version 20.6.5.2. Does anyone here have any ideas why the TCPDUMP isn't working as expected?

[Kanan Huseynli]

Hi,

Can you try "tcpdump vpn 0 interface ge0/1.200 options "host 200.160.0.8 -n" ?

Secondly, it seems you have bash script error output, maybe you have lack of permission to run this command fully (most probably in background this command is run in Linux shell where you don't have sufficient permissions)

[maverick0]

@MHM Cisco World 

I configured NTP to use VPN 0, but I believe it is the default value and is not visible in the running-config. Anything other than VPN0 will be visible in the running-config.