Document PPP_FILTER; bpf based filtering for pppd.
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.\" $NetBSD: options.4,v 1.12 1997/03/11 03:49:04 perry Exp $
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.\" $NetBSD: options.4,v 1.13 1997/03/12 20:35:45 christos Exp $
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.\"
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.\" Copyright (c) 1996
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.\" Perry E. Metzger. All rights reserved.
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@ -704,6 +704,14 @@ the remote end would not respond.
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This option turns on the packet filter interface hooks. See
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.Xr pfil 9
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for details.
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.It Cd options PPP_FILTER
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This option turns on
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.Xr pcap 3
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based filtering for ppp connections. This option is used by
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.Xr pppd 8
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which needs to be compiled with
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.Em PPP_FILTER
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defined (the current default).
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.El
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.Ss System V IPC Options
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.Bl -ohang
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