Winpkfilter driver
Author: s | 2025-04-24
WinpkFilter Miniport driver is a windows driver. Common questions for WinpkFilter Miniport driver Q: Where can I download the WinpkFilter Miniport driver's driver? Winpk filter driver. Winpkfilter driver. Download winpk filter. Winpkfilter driver windows 7. Winpkfilter driver windows 8.1. Windows packet filtering software.
The WinpkFilter Device Driver - NAT32
I noticed following strange behaviour when WinpkFilter is used in conjuction with several NICs (Ethernet: Realtek 8139, 3COM 3C940 WLAN: Broadcom BCM4318, Texas Instruments ACX100).When continously sending UDP packets using blocking sockets, e.g. performing a throughput benchmark with TTCP, the sendto() calls return immediately and result in a bogus throughput of 30 – 60 MB/s, whereas only a small fraction of the packets passed to the sockets interface are indeed transmitted by the adapter. The larger fraction of the packets gets lost in the network stack. The bogus rates at which the sokets interface consumes the UDP packets (30 – 60 MB/s as stated above) do not depend on the maximal bandwith of the underlying NIC, they were observed when sending through the two Ethernet NICs (connectesd to a 100 Mbit Switch) as well as when sending through the two WLAN NICs (802.11b mode).This behaviour is independent of the machine WinpFilter is running on, it is also independent of the UDP packet size and it doesn’t play any role whether WinpkFilter ist just installed (i.e. driver ndisrd is running in idle mode) or actively in use, e.g. by the PassThrough demo application.However, uninstalling WinpkFilter restores normal UDP sockets behaviour. That means, the sockets interface accepts UDP packets at a rate which does not exceed the possible bandwith offered by the underlying NIC and packets aren’t dropped by the network stack. On a 100 Mbit network, UDP achieves a throughput around 11,5 MB/s and on a 802.11b WLAN around 800 KB/s. These values are marginally below the theoretical throughput of the corresponding network.It seems that WinpkFilter turns blocking UDP sockets in a nonblocking mode where they accept as many packets as many the CPU can process. The larger fraction of these packets then gets dropped by the network stack because of overfull buffers. Only when using an Intel PRO/100B Ethernet NIC (the 5th card I tested), the UDP sockets behave the normal way, but only when WinpkFilter is running in idle mode. When the PassThrough demo application gets activated on this NIC, the UDP sockets again turn into nonblocking absorbers which WinpkFilter Miniport driver is a windows driver. Common questions for WinpkFilter Miniport driver Q: Where can I download the WinpkFilter Miniport driver's driver? Drop the greatest part of the passed packets.As you can see, I peformed tests with 5 NICs and only when using one of them and having WinpkFilter in idle mode the UDP sockets interface behaved normally.It is interesting to note that when using TCP no strange behavior of WinpkFilter was observed on any of the NICs. I know that TCP uses flow and congestion control, but monitoring a TCP session with Ethereal revealed that there weren’t any retransmissions or duplickate ACKs. That means there weren’t any data pieces which got lost in the network stack in contranst to using UDP.I hope, that someone can give a reasonable explanation of this phenomenon and maybe suggest a workaround. Usually an application can expect that all UDP packets it passes to sendto() get transmitted by the NIC, especially when there is any other network traffic originated by the same machine.Many thanks in advance, Max.Comments
I noticed following strange behaviour when WinpkFilter is used in conjuction with several NICs (Ethernet: Realtek 8139, 3COM 3C940 WLAN: Broadcom BCM4318, Texas Instruments ACX100).When continously sending UDP packets using blocking sockets, e.g. performing a throughput benchmark with TTCP, the sendto() calls return immediately and result in a bogus throughput of 30 – 60 MB/s, whereas only a small fraction of the packets passed to the sockets interface are indeed transmitted by the adapter. The larger fraction of the packets gets lost in the network stack. The bogus rates at which the sokets interface consumes the UDP packets (30 – 60 MB/s as stated above) do not depend on the maximal bandwith of the underlying NIC, they were observed when sending through the two Ethernet NICs (connectesd to a 100 Mbit Switch) as well as when sending through the two WLAN NICs (802.11b mode).This behaviour is independent of the machine WinpFilter is running on, it is also independent of the UDP packet size and it doesn’t play any role whether WinpkFilter ist just installed (i.e. driver ndisrd is running in idle mode) or actively in use, e.g. by the PassThrough demo application.However, uninstalling WinpkFilter restores normal UDP sockets behaviour. That means, the sockets interface accepts UDP packets at a rate which does not exceed the possible bandwith offered by the underlying NIC and packets aren’t dropped by the network stack. On a 100 Mbit network, UDP achieves a throughput around 11,5 MB/s and on a 802.11b WLAN around 800 KB/s. These values are marginally below the theoretical throughput of the corresponding network.It seems that WinpkFilter turns blocking UDP sockets in a nonblocking mode where they accept as many packets as many the CPU can process. The larger fraction of these packets then gets dropped by the network stack because of overfull buffers. Only when using an Intel PRO/100B Ethernet NIC (the 5th card I tested), the UDP sockets behave the normal way, but only when WinpkFilter is running in idle mode. When the PassThrough demo application gets activated on this NIC, the UDP sockets again turn into nonblocking absorbers which
2025-03-28Drop the greatest part of the passed packets.As you can see, I peformed tests with 5 NICs and only when using one of them and having WinpkFilter in idle mode the UDP sockets interface behaved normally.It is interesting to note that when using TCP no strange behavior of WinpkFilter was observed on any of the NICs. I know that TCP uses flow and congestion control, but monitoring a TCP session with Ethereal revealed that there weren’t any retransmissions or duplickate ACKs. That means there weren’t any data pieces which got lost in the network stack in contranst to using UDP.I hope, that someone can give a reasonable explanation of this phenomenon and maybe suggest a workaround. Usually an application can expect that all UDP packets it passes to sendto() get transmitted by the NIC, especially when there is any other network traffic originated by the same machine.Many thanks in advance, Max.
2025-04-05NAT32SR Supplementary Router Configuration GuideIntroductionA supplementary router is an IP router that resides in a home or office network for the purpose ofproviding participating machines with additional features and services that the main router cannot(or will not) provide. The supplementary router is connected to the home network via Ethernet or WiFi,and machines that wish to use it simply request a DHCP lease from that router rather than from themain router. No configuration changes of any kind are needed on the main router.HardwareThe NAT32SR supplementary router software runs perfectly on mini-PCs running Windows 8.1 with Bing,and this guide describes the setup and configuration steps needed for running NAT32SR on one such system:the PiPO X7 mini-PC described here.The above sample configuration consists of a private network (192.168.178.0) provided by a DSL router withthe address 192.168.178.1. The router has four private LAN ports to which are attached three PCs and theNAT32SR box. The PCs will probably all have been configured by the DSL router's DHCP server, but the NAT32SRbox must be configured to use a fixed IP address such as 192.168.178.32.SoftwareThe current version of the NAT32SR software is availablehere. It is provided as a zip file that should beextracted to the root directory of a Micro SD Card that is then inserted into the PiPO TF Card slot.This approach helps conserve the limited amount of SSD memory space available on the PiPO X7.The NAT32SR Software is provided as a free download for personal use only. It is bundled with an unlicensedcopy of the WinPkFilter driver, and the Authors of the said Software may withdraw this License at any time.By using the Software you agree to free the Authors of all responsibility for any Loss or Damage that mayhave resulted from the use of the Software.After extracting the software, the SD card will have all needed files in their correct locations.Before proceeding to the NAT32SR configuration step, be sure to configure the Ethernet adapterto use a fixed IP address on your DSL Router's network. For example, if your DSL Router has the IP address192.168.178.1, then configure the adapter to use: IP address: 192.168.178.32 Mask: 255.255.255.0 Gateway: 192.168.178.1 DNS address: 192.168.178.1The TCP/IP settings of Network adapters are configured in the Windows 8.1 "Network and Sharing Center".NAT32SR ConfigurationThe NAT32SR application requires no installation under Windows. This is because it consists of just asingle executable file and it requires no special DLLs or Registry entries in order
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