From owner-FreeBSD-users-jp@jp.freebsd.org  Mon Aug 10 16:17:04 1998
Received: (from daemon@localhost)
	by jaz.jp.freebsd.org (8.8.8+3.0Wbeta13/8.7.3) id QAA20255;
	Mon, 10 Aug 1998 16:17:04 +0900 (JST)
	(envelope-from owner-FreeBSD-users-jp@jp.FreeBSD.org)
Received: from dnsgw.tmca.ac.jp (dnsgw.tmca.ac.jp [202.209.88.10])
	by jaz.jp.freebsd.org (8.8.8+3.0Wbeta13/8.7.3) with ESMTP id QAA20238
	for <FreeBSD-users-jp@jp.freebsd.org>; Mon, 10 Aug 1998 16:17:00 +0900 (JST)
	(envelope-from freebsd@tmca.ac.jp)
Received: by dnsgw.tmca.ac.jp (1.39.111.2/3.5Wbeta-dnsgw)
	id AA058823443; Mon, 10 Aug 1998 16:17:23 +0900
Received: from unknown(192.168.1.13) by dnsgw.tmca.ac.jp via smap (V1.3)
	id sma005868; Mon Aug 10 16:17:06 1998
Received: from i386.honkan3.tmca.ac.jp by tmca.ac.jp (1.39.111.2/3.5Wbeta-mailsv)
	id AA204523394; Mon, 10 Aug 1998 16:16:34 +0900
Received: (qmail 2220 invoked by uid 1001); 10 Aug 1998 07:16:53 -0000
Message-Id: <19980810071653.2219.qmail@i386.honkan3.tmca.ac.jp>
From: "Murakami Hiroshi" <freebsd@tmca.ac.jp>
To: FreeBSD-users-jp@jp.freebsd.org
Date: Mon, 10 Aug 1998 16:16:53 +0900 (JST)
Cc: freebsd@tmca.ac.jp
X-Mailer: ELM [version 2.4ME+ PL32 (25)]
Mime-Version: 1.0
Content-Type: text/plain; charset=iso-2022-jp
Content-Transfer-Encoding: 7bit
Reply-To: FreeBSD-users-jp@jp.freebsd.org
Precedence: bulk
X-Distribute: distribute version 2.1 (Alpha) patchlevel 24e+980729
X-Sequence: FreeBSD-users-jp 31635
Subject: [FreeBSD-users-jp 31635] Packet Filtering. 
Errors-To: owner-FreeBSD-users-jp@jp.freebsd.org
Sender: owner-FreeBSD-users-jp@jp.freebsd.org



	C $@%/%i%9$N%0%m!<%P%k%"%I%l%9$r;}$C$?%M%C%H%o!<%/(J 
	xxx.xxx.xxx.0/24 $@$,$"$j(J, $@$=$3$K$O(J xxx.xxx.xxx.254 $@$N%^%7%s$H(J
	xxx.xxx.xxx.{1$@!A(J253} $@$N%^%7%s(J($@8=:_$O$3$A$i$K$O(J4$@Bf(J)$@$,$"$j$^$9(J.


              $@@lMQ@~(J ##############
 Internet$@$X(J <--------#$@@lMQ@~%k!<%?(J#
                     ##############
                            | 254
                            |
                            |      <==== $@$3$3$K%U%#%k%?!<$r$O$5$_$?$$$N$@$,(J.
                            |
                            |   xxx.xxx.xxx.0/24
            ----+-------+---+----+-------+-------
                |       |        |       |
                |       |        |       |
                | 10    | 11     | 12    | 13
              ######  ######   ######  ######
              ######  ######   ######  ######


	xxx.xxx.xxx.254 $@$O$3$N%M%C%H%o!<%/$N%2!<%H%&%'!<%"%I%l%9$G$"$j(J,
	Internet$@$X=P$F9T$/$H$-$N@lMQ@~$X$N(J router $@%^%7%s$N%"%I%l%9$G$9(J.

	xxx.xxx.xxx.254 $@$b(J xxx.xxx.xxx.{1$@!A(J253} $@$N%^%7%s(J($@<B:]$K$O(J4$@Bf(J)$@$b(J
	Internet$@$+$i%"%/%;%9$5$l$k%"%I%l%9$J$N$GJQ99$7$?$/$J$$$H$7$^$9(J.

	$@$5$F!"(Jpacket$@$N2s@~$NBS0hMFNL$NM%@h3d$jEv$F%U%#%k%?!<$d(J, ping flood 
	$@$r$5$1$k0Y$N(J ip packet filter $@$NF/$-$r$9$k(J router$@5!G=$r;}$D(J
	$@%^%7%s$r(J  FreeBSD $@$G:n$C$F$d$j(J, xxx.xxx.xxx.254 $@$H(J xxx.xxx.xxx.{1$@!A(J253} 
	$@$N%^%7%s72$H$NCf4V$K$O$5$s$G$$$l$?$$$H9M$($k$N$G$9$,!"$=$s$J$3$H$,(J
	$@$G$-$k$G$7$g$&$+!)(J 
	
	$@$3$N%U%#%k%?!<$r$9$k%^%7%s$K(J2$@$D$N(J NIC $@$r$D$1$k$H$7$F!"N>J}$N(J NIC $@$K(J
	xxx.xxx.xxx.aaa, xxx.xxx.xxx.bbb $@$H$$$&%"%I%l%9$r$U$k$o$1$K$O9T$+(J
        $@$J$$$@$m$&$H;W$&$N$G(J. xxx.xxx.xxx.0/24 $@$H$$$&(J C $@%/%i%9$N%M%C%H%o!<%/(J
        $@%"%I%l%9$rNc$($P(J xxx.xxx.xxx.0/25 $@$H(J xxx.xxx.xxx.128/25 $@$H$$$&$U$&$K(J
        2$@8D$N%5%V%M%C%H$KJ,2r$7$F!"(J2$@8D$N(J NIC $@$K$=$l$>$l$r3d$j?6$C$F$d$l$P(J
        $@$h$5$=$&$K;W$($^$9$,!"(J... $@$O$?$7$F$=$N>l9g(J,$@$3$l$^$G(J Internet $@$+$i(J
        $@$_$F(J24$@%S%C%H%^%9%/$N%M%C%H%o!<%/$K$"$k$H;W$C$F$$$?(J4$@Bf(J+1$@Bf$N%^%7%s$X$J$s$i$+$o$k(J
        $@$3$H$J$/%"%/%;%9$,=PMh$k$N$G$7$g$&$+(J? $@$^$?!"$3$l$i(J4$@Bf$N%^%7%s$N(J
	IP-address$@$d(Jnetmask$@$N@_Dj$bJQ$($?$/$O$J$$$N$G$9(J.

	$@$b$C$HNI$$J}K!$r$4B8CN$J$i!"65$($F2<$5$$(J. HUB $@$_$?$$$K(J IP-address $@$r(J
        $@;}$?$J$$5!3#$r(JFreeBSD$@$G:n$l$k$H$3$N$h$&$J$3$H$r$9$k$K$OJXMx$J$s$G(J
        $@$7$g$&$1$I(J.
