Complicating Factors

About this task

To capture more complicated web applications, there are many possible DNCA deployment architectures. They can include the use of multiple DNCAs, multiple DNCA instances, and various filtering mechanisms. Below, you can review example scenarios in which you can need assistance in configuring the DNCA.

Procedure

  1. High-volume web applications. If you are delivering over 200 hits/s over SSL or over 400 hits/s over clear-text HTTP:
    • You must split the traffic across multiple DNCA instances.
    • You must filter out the IP addresses of web servers from which you want to capture. You can filter at the DNCA level or the network level. Discover recommends performing filtering at the network level, which lowers the processing overhead on the DNCA.
      Note: IP filtering is possible only if the IPs are not NAT'd internally. For more information, contact your network administrator.
  2. Capturing a range of IP addresses. If you are capturing a range of 25 IPs or more on the DNCA:
    • You must create IP filters to drop content.
    • You must use netmasks to limit the number of entries in your configuration.
    • You must split the traffic across multiple DNCA instances.