title: DHCP Option 77 - malformed option
body: <p>I'am developing an industrial application based on an open source DHCP client.</p>
  
  <p>I am setting a custom DHCP client class id (DHCP Option 77)</p>
  
  <p>ipconfig /setclassid "Local Area Connection" "SOME_CUSTOM_CLASS_ID"</p>
  
  <p>and in Wireshark I am capturing the DHCP handshake. The custom class id is present in the DHCP request, but wireshark has the Option 77 info highlighed with the error "malformed option".</p>
  
  <p>Referring to RFC 3004 standard i found  that each instance of user class data should have a 1 octet prefix of the length that can fixe the problem and  dismiss DHCP all wireshark error.</p>
  
  <p>The problem know is that some version of wireshark detect this error like version 1.10.6 other version can't detect like version 1.6.5.</p>
  
  <p>Any ideas on this? Is it a bug in Wireshark ?</p>