title: Filtering factor in dataframe
body: <p>I have this table:</p>
  
  <pre><code>Source                     Protocol
  10.0.0.6                    IGMPv3
  10.0.0.6                    SSDP
  fe80::2998:5ae5:5e72:7f9    SSDP
  fe80::2998:5ae5:5e72:7f9    SSDP
  a0:48:1c:df:1b:1b           ARP
  a0:48:1c:df:1b:1b           ARP
  10.0.0.11                   TCP
  10.0.0.11                   HTTP
  Vmware_98:56:e6             ARP
  Vmware_98:56:e6             ARP
  12.0.0.11                   IGMPv6
  23.3.1.11                   BROWSER
  </code></pre>
  
  <p>I need to filter the mac addresses without hard coding it, expected output:</p>
  
  <pre><code>Source                     Protocol
  10.0.0.6                    HTTP
  10.0.0.6                    SSDP
  10.0.0.11                   TCP
  10.0.0.11                   HTTP
  12.0.0.11                   IGMPv6
  23.3.1.11                   BROWSER
  </code></pre>