docs/102719: [patch] ng_bpf(4) example leads to unneeded promisc
>Number: 102719
>Category: docs
>Synopsis: [patch] ng_bpf(4) example leads to unneeded promiscuos mode activation
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-doc
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: doc-bug
>Submitter-Id: current-users
>Arrival-Date: Thu Aug 31 06:10:12 GMT 2006
>Closed-Date:
>Last-Modified:
>Originator: Eugene Grosbein
>Release: FreeBSD 6.1-STABLE i386
>Organization:
Svyaz Service JSC
>Environment:
System: FreeBSD nkz.delikates-nk.ru 6.1-STABLE FreeBSD 6.1-STABLE #0: Wed Aug 16 20:09:18 KRAST 2006 sa@nkz.delikates-nk.ru:/home/obj/home/src/sys/NKZ i386
>Description:
ng_bpf(4) teaches to use tcpdump(1) to generate raw BPF
instructions. However, the exact command line does not
include '-p' option. This may activate promiscous mode on
first ethernet interface, if any. This is not needed and
should not happen.
>How-To-Repeat:
Use example from bg_bpf(4) manual page and see pair of
'promiscuous mode enabled/promiscuous mode disabled' messages
in the kernel log.
>Fix:
--- src/share/man/man4/ng_bpf.4.orig Sat Feb 5 18:31:31 2005
+++ src/share/man/man4/ng_bpf.4 Thu Aug 31 13:49:15 2006
@@ -170,7 +170,7 @@
}
xxENDxx
-BPFPROG=`tcpdump -s 8192 -ddd ${PATTERN} | awk -f /tmp/bpf.awk`
+BPFPROG=`tcpdump -s 8192 -i lo0 -p -ddd ${PATTERN} | awk -f /tmp/bpf.awk`
ngctl msg ${NODEPATH} setprogram { thisHook=\\"${INHOOK}\\" \\
ifMatch=\\"${MATCHHOOK}\\" \\
>Release-Note:
>Audit-Trail:
>Unformatted:
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