In order to troubleshoot issues related to TFTP or DHCP, we may need to capture network traces during initial VM bootup. As Virtual interface is not loaded during initial bootup phase of VM, we need to capture trace on the tap device

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Instructions

1. Download the attached getdump.sh script to /root folder on XenServer

 

1. SSH into XenServer Console and provide execute permission for the script

                    #chmod 777 /root/getdump.sh

   3)    Get the UUID of VM

               # xe vm-list name-label=<NAME OF VM> params=uuid

 

   4)    Make sure the VM is in shutdown state before running the script. The script will start the VM and     attaches the tcpdump process to the correct tap device

 

  5)    Run the script passing the UUID in step 3 as argument

               #./getdump.sh <UUID in step3>

 

The pcap file will be captured under the present working directory as in format dump$(date +%Y%m%d).pcap

 

Note : The script need to be run in the same host as where the VM is started

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