Re: ndis hooking firewall

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thank you for your help. I would like to know if someone knows here – what technique use sygate, zonealarm, mcafee and othere known firewalls? I seriously doubt they use ndis IM driver. Sygate si tell to use an intermediate driver teefer.sys, but I doubt it is a real ndis intermediate driver once it detects protocol driver registrations and so on. Do they have WHQL certification?