Set Up ntpcap.ini and ntservice.ini for Merging Between SmartNICs

libpcap Installation

product_line_custom
Napatech SmartNIC
category
Software Installation Guide

Before you begin

Note: For merging between SmartNICs, time synchronization is required. See DN-0384, DN-0985 and/or DN-0737 for further information regarding time synchronization.

About this task

If merging of packets between SmartNICs is needed, the packet-based interface must be used. This means that the PCAP packet descriptor and the PCAP-ns and PCAP-μs time stamp formats cannot be used.

Steps

To set up for merging packets between SmartNICs:

Procedure

  1. In the ntpcap.ini file, include the following to set up packet-based interface.
    NTInterface = Packet
  2. In the ntservice.ini file, include the following to select the standard packet descriptor (default setting).
    PacketDescriptor = NT
  3. In the ntservice.ini file, select one of the following to select the native, native UNIX (default setting) or native NDIS time stamp format, respectively.
    • TimestampFormat=NATIVE
      Note: The native format is based on a 10 ns unit with a 64-bit unit counter.
      Note: This time stamp format does not apply to 4GA SmartNICs.
    • TimestampFormat=NATIVE_UNIX
      Note: The native UNIX format is based on a 10 ns unit with a 64-bit unit counter. The start time is January 1st 1970.
    • TimestampFormat=NATIVE_NDIS
      Note: The native NDIS format is based on a 10 ns unit with a 64-bit unit counter. The start time is January 1st 1601.
      Note: This time stamp format does not apply to 4GA SmartNICs.
      Note: When using the native NDIS format you cannot set a time on a PCIe Gen3 or a PCIe Gen2 SmartNIC (or on a PCIe Gen1 SmartNIC using the config tool) before January 1st 1970.