Firewall windows intermediate driver

 · IMPORTANT: The below explanation about the use of an NDIS intermediate driver also applies to ENS Firewall. A major component of Host IPS is the host firewall. Like all modern host-based firewalls, Host IPS 8.x uses an NDIS intermediate driver to perform network filtering operations at packet level. When Host IPS is installed, the insertion of the firewall’s NDIS driver causes Microsoft . The Intermediate Driver is installed into the NDIS between the bottom layer which communicates with the NIC and the top layer which provides the NDIS interface to protocol drivers.

IMPORTANT: The below explanation about the use of an NDIS intermediate driver also applies to ENS Firewall. A major component of Host IPS is the host firewall. Like all modern host-based firewalls, Host IPS 8.x uses an NDIS intermediate driver to perform network filtering operations at packet level. When Host IPS is installed, the insertion of the firewall’s NDIS driver causes Microsoft Windows to tear down and rebuild the IP stacks on connected interfaces. “It is not recommended to implement a firewall-hook driver (or firewall driver) for Microsoft Windows XP and later versions of the operating system. To provide firewall functionality on Windows XP and later, you should create an NDIS intermediate miniport driver to manage packets sent and received across a firewall.”. Basically, a Firewall-Hook driver can do the same work that a Filter Hook driver can do (see my article, Developing Firewalls for Windows /XP, to get more information) but with less restrictions. If you remember, Filter-Hook driver only allows one filter function installed in the system. If one application already uses this functionality, your application doesn't work. With Firewall-Hook driver, you don't have this problem. You can install all filter functions you need.

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