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SDK_CHANGELOG.md

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Npcap SDK 1.16 [2026-01-07]

  • Upgraded libpcap to 1.10.6.

  • Renamed the SKF_AD_* constants to NPCAP_AD_* to avoid confusion with code that may expect the same values or ordering as the constants defined by Linux. The old names are still conditionally defined for convenience.

  • Defined additional modes for PacketSetMode()/pcap_setmode(): MODE_SENDTORX and MODE_SENDTORX_CLEAR to enable and disable the SendToRx feature independent of systemwide Registry setting. Requires Npcap 1.83 driver or later.

  • Enable nanosecond-precision timestamps on a packet handle using PACKET_MODE_NANO with PacketSetMode(). Requires Npcap 1.83 driver or later.

  • Added new constants for PacketGetInfo(): NPF_GETINFO_MODES returns supported mode bits for PacketSetMode(). NPF_GETINFO_STATS retrieves performance statistics for the filter module. NPF_GETINFO_MODDBG gets internal debugging info unique to a filter module. These require Npcap 1.84 driver or later.

Npcap SDK 1.15 [2025]

  • Added a new function, PacketGetInfo(). This uses the PACKET_OID_DATA structure to issue information requests to the Npcap driver. Currently defined requests are NPF_GETINFO_VERSION, NPF_GETINFO_CONFIG, and NPF_GETINFO_BPFEXT.

  • Using PacketGetInfo() with NPF_GETINFO_BPFEXT allows user code to determine which BPF extensions are supported by the driver. The first extensions supported by the driver will be SKF_AD_VLAN_TAG and SKF_AD_VLAN_TAG_PRESENT, which have the same meanings as the Linux kernel's BPF extensions of the same names.

  • Moved Npcap's BPF definitions to npcap-bpf.h and other definitions to npcap-defs.h to allow them to be used independently of Packet32.h. They are included by Packet32.h, so there should be no need to change existing code.

Npcap SDK 1.14 [2022-08-18]

  • Restored PacketLibraryVersion export. It is still preferred to use PacketGetVersion()

Npcap SDK 1.13 [2022-06-21]

  • Added SAL annotations to most function prototypes and several struct fields in Packet32.h

  • The undocumented char PacketLibraryVersion[] export has been removed from Npcap 1.70 and later. The PacketGetVersion() function is the documented way to get the runtime version of the Packet.dll library.

  • PacketGetNetType() now always sets the LinkSpeed field to 0. Many adapters did not support the OID that was being used to get the link speed, and libpcap (Npcap's published API) does not pass this information through, so there should be no impact on the majority of software. Software that needs link speed may use pcap_oid_get_request() or GetAdaptersAddresses() to get the information.

Npcap SDK 1.12 [2021-12-06]

  • Added this changelog.

  • Included wpcap.lib for ARM64.

  • Updated Examples-pcap/pcap_filter to show modern API usage with pcap_create() and pcap_activate().

  • Removed documentation and examples for the "kernel dump" feature of WinPcap, which has never been supported by Npcap and was disabled in WinPcap 3.1. The Packet32.h functions which supported this mode have been marked as deprecated.

Npcap SDK 1.11 [2021-09-03]

  • Fix an issue with libpcap header files which required VS 2015 or later. This change was made to accommodate a few existing licensees. We strongly recommend using a currently-supported compiler version to build software with Npcap.

  • Added const qualifiers to input parameters for several Packet32.h functions.

Npcap SDK 1.10 [2021-06-22]

  • ARM64 libs for Packet.dll added.

  • Updated documentation.

Npcap SDK 1.07 [2021-03-10]

  • Updated libpcap headers to 1.10.1 from 1.9.1. See the libpcap CHANGES file and issue #276 for notable changes.

  • Added Packet32.h functions to set per-handle time source and precision. This supports libpcap function pcap_set_tstamp_type() on Npcap 1.20 and later.

Earlier changes not tracked.