2 Replies Latest reply on Feb 21, 2018 5:32 PM by Bayu Wibowo

    Can I view Flow Monitoring of a vServer VIP?

    vmmed1 Novice

      If I go into Flow Monitor I can search for VMs and choose the vNIC to do flow monitoring.

      But if I try to find a VM which represents a particular load balancer it's not in there.

      Is that something that can be changed? I sometimes need to troubleshoot issues

      with partners or customers and only being able to see the back end of the conversation

      - SNIP to VM/vNIC is painful. Those flows show me the LB SNIP address as the

      source not the actual source address.


      Also is it possible to save the output from a flow monitoring session so It can

      be reviewed like a tcpdump or wireshark pcap? As it is the TCP conversation

      statuses roll by so quickly that I have do decide what's going on or have

      the other part retry. I can slow it down so that it only flips every 30

      seconds or whatever but still output that could be carefully reviewed

      would be much better.

        • 1. Re: Can I view Flow Monitoring of a vServer VIP?
          lhoffer Hot Shot
          VMware EmployeesvExpert

          You won't see ESG vNICs in the Flow Monitoring tool, however, do packet captures on the ESG to see traffic on either side of the connection there and also save as a pcap.  Syntax is similar to that of TCP dump with the exception of using underscores where you'd normally have spaces.  Section 14 of the Load Balancer Troubleshooting Using the CLI portion of the troubleshooting guide has some examples of the commands with various filters, etc.

          • 2. Re: Can I view Flow Monitoring of a vServer VIP?
            Bayu Wibowo Master
            User ModeratorsCommunity Warriors

            As mentioned in Luke's reply, there are some few CLI commands that you can use from NSX Edge


            If you want to see the client's IP from NSX Edge CLI, you can try to use these commands

            show service loadbalancer table

            show service loadbalancer table ipv4_ip_table...


            you can also do a debug packet capture in NSX Edge using below commands

            debug packet capture interface <interface-name>

            debug packet display interface <interface-name>


            you can do filter and separate the objects using _ for example:

            debug packet display interface vNic_0 host_192.168.110.11_and_host_192.168.110.12

            Bayu Wibowo | vExpert NSX, VCIX6-DCV/NV, Cisco Champion, AWS-SAA
            Author of VMware NSX Cookbook http://bit.ly/NSXCookbook
            https://nz.linkedin.com/in/bayupw | twitter @bayupw
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