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Date:      22 May 1998 19:44:12 -0500
From:      Dave Marquardt <marquard@zilker.net>
To:        freebsd-hackers@FreeBSD.ORG
Subject:   Re: Questions about Packet Filter
Message-ID:  <854syh95pf.fsf@localhost.zilker.net>
In-Reply-To: Mike Smith's message of "Wed, 20 May 1998 11:45:46 -0700"
References:  <199805201845.LAA01405@dingo.cdrom.com>

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Mike Smith <mike@smith.net.au> writes:
> > Very appreciated if anybody can answer the questions:
> > 
> > 1. Does BPF support the monitoring of out going packages? how? I know
> > it can monitor the receiving packages and directly write a new package
> > into the specified network interface. How about the packages written
> > by other network or transport protocols?
> 
> Yes.  A simple test would have show you this.
> 
> > 2. Solaris seems having a similar soft-driver called "Network
> > Interface Tap". Anybody use that before? Can it monitoring both
> > incoming and outgoing packages?
> 
> Yes.
> 
> > 3. Any similar programming interface in the socket level? 
> 
> No.
> 
> > 4. How about in HP-UX, Linux, and AIX?

AIX has BPF, but read only.  BPF was ported read-only to support
tcpdump.

-Dave

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