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Date: Tue, 11 Aug 1998 11:37:57 +0900
To: FreeBSD-users-jp@jp.freebsd.org
From: bugbird@dkkaraoke.co.jp (Toshiboumi Ohta)
Cc: FreeBSD-users-jp@jp.freebsd.org, freebsd@tmca.ac.jp
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Subject: [FreeBSD-users-jp 31657] Re: Packet Filtering.
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$BB@ED!wBh0l6=>&!!$H!!$b$&$7$^$9(J

$B!t!!E,592~9T$rDI2C$7$^$7$?(J

At 16:16 98.8.10, Murakami Hiroshi wrote:
<snip>
>               $B@lMQ@~(J ##############
>  Internet$B$X(J <--------#$B@lMQ@~%k!<%?(J#
>                      ##############
>                             | 254
>                             |
>                             |      <==== $B$3$3$K%U%#%k%?!<$r$O$5$_$?$$$N$@$,(J.
>                             |
>                             |   xxx.xxx.xxx.0/24
>             ----+-------+---+----+-------+-------
>                 |       |        |       |
>                 |       |        |       |
>                 | 10    | 11     | 12    | 13
>               ######  ######   ######  ######
>               ######  ######   ######  ######
<snip>
>         $B$5$F!"(Jpacket$B$N2s@~$NBS0hMFNL$NM%@h3d$jEv$F%U%#%k%?!<$d(J, ping flood 
>         $B$r$5$1$k0Y$N(J ip packet filter $B$NF/$-$r$9$k(J router$B5!G=$r;}$D(J
>         $B%^%7%s$r(J  FreeBSD $B$G:n$C$F$d$j(J, xxx.xxx.xxx.254 $B$H(J
>         xxx.xxx.xxx.{1$B!A(J253} 
>         $B$N%^%7%s72$H$NCf4V$K$O$5$s$G$$$l$?$$$H9M$($k$N$G$9$,!"$=$s$J$3$H$,(J
>         $B$G$-$k$G$7$g$&$+!)(J 

$B!!$3$l$O%;%0%a%s%H$N@_7W$r$I$&$9$k$+$K0MB8$9$kLdBj$G$9$M!#%U%#%k%?5!G=(J
$B$rF/$+$;$?%k!<%?$r>e?^$N%H%]%m%8$KA^F~$9$k$H$$$&$3$H$O!"%;%0%a%s%H$rJ,3d(J
$B$7$F0[$J$C$?%M%C%H%o!<%/%"%I%l%9$r$=$l$>$l$N%;%0%a%s%H$K3d$j?6$k$3$H$K$J$k(J
$B$+$i$G$9!#$@$+$i!"%;%0%a%s%HJ,3d$9$k$D$b$j$G$"$l$P2DG=!"$H$$$&$3$H$K$J$j(J
$B$^$9!#(J

>         $B$3$N%U%#%k%?!<$r$9$k%^%7%s$K(J2$B$D$N(J NIC $B$r$D$1$k$H$7$F!"N>J}$N(J NIC $B$K(J
>         xxx.xxx.xxx.aaa, xxx.xxx.xxx.bbb $B$H$$$&%"%I%l%9$r$U$k$o$1$K$O9T$+(J
>         $B$J$$$@$m$&$H;W$&$N$G(J. xxx.xxx.xxx.0/24 $B$H$$$&(J C $B%/%i%9$N%M%C%H%o!<%/(J
>         $B%"%I%l%9$rNc$($P(J xxx.xxx.xxx.0/25 $B$H(J xxx.xxx.xxx.128/25 $B$H$$$&$U$&$K(J
>         2$B8D$N%5%V%M%C%H$KJ,2r$7$F!"(J2$B8D$N(J NIC $B$K$=$l$>$l$r3d$j?6$C$F$d$l$P(J
>         $B$h$5$=$&$K;W$($^$9$,!"(J... $B$O$?$7$F$=$N>l9g(J,$B$3$l$^$G(J Internet $B$+$i(J
>         $B$_$F(J24$B%S%C%H%^%9%/$N%M%C%H%o!<%/$K$"$k$H;W$C$F$$$?(J4$BBf(J+1$BBf$N%^%7%s(J
>         $B$X$J$s$i$+$o$k(J
>         $B$3$H$J$/%"%/%;%9$,=PMh$k$N$G$7$g$&$+(J? 

$B!!$3$N>l9g!"$?$H$(%5%V%M%C%H$r@_$1$F$b@lMQ@~%k!<%?B&$N%;%0%a%s%H$H%^%7%s72(J
$BB&%;%0%a%s%H$O8DJL$N%M%C%H$H$7$F07$o$l$k$3$H$K$J$j$^$9$+$i!"2?Ey$+$N<jCJ$G(J
$B%$%s%?!<%M%C%H$^$GFO$/%k!<%F%#%s%0>pJs$r%^%7%s72$KDs6!$G$-$k$h$&$K!"?7@_(J
$B$9$k%k!<%?$H(J *$B%^%7%s72$K$b(J* $BBP1~$5$;$F$d$kI,MW$,$"$j$^$9!#(J

>         IP-address$B$d(Jnetmask$B$N@_Dj$bJQ$($?$/$O$J$$$N$G$9(J.
<snip>

$B!!!D$H!"$$$&$3$H$+$i$9$k$l$P(J

$B#1!K%k!<%?$O?7@_$;$:$K!"%U%#%k%?%j%s%0$O@lMQ@~%k!<%?$N@_Dj$N$_$K$F(J
$B!!!!BP1~$9$k(J

$B#2!K@lMQ@~%k!<%?$N%"%I%l%9$K@_Dj$7$?%U%#%k%?%j%s%0%k!<%?$r?7@_$7!"(J
$B!!!!@lMQ@~%k!<%?$H?75,%k!<%?$N4V$K?75,$N%M%C%H%o!<%/%"%I%l%9$N(J
$B!!!!%;%0%a%s%H$r@_$1$k(J

              $B@lMQ@~(J ##############
 Internet$B$X(J <--------#$B@lMQ@~%k!<%?(J#
                     ##############
           yyy.yyy.yyy.0/24 | yyy.yyy.yyy.aaa
                            | yyy.yyy.yyy.bbb
                     ##############
                     # $B?7@_%k!<%?(J #
                     ##############
                            | xxx.xxx.xxx.254
                            |   xxx.xxx.xxx.0/24
            ----+-------+---+----+-------+-------
                | 10    | 11     | 12    | 13
              ######  ######   ######  ######
              ######  ######   ######  ######

$B$"$?$j$NBP:v$,BEEv$8$c$J$$$+$H;W$$$^$9!#(J

$B!!#1!K$O%k!<%?$N;EMM$K?<$/0MB8$9$k$3$H!"#2!K$O0l;~E*$K40A4$K%5!<%S%9(J
$B$rDd;_$7$J$1$l$P$J$i$J$$!D$H$$$&$H$3$m$,7|0F$K$J$k$G$7$g$&$+!#(J

----
DAIICHI KOSHO Co., Ltd. {+81-3-3280-2131} % finger bugbird
Login name: bugbird@dkkaraoke.co.jp    In real life: Toshiboumi Ohta
Directory: http://www.DKKaraoke.co.jp/ Shell: /WE_LOVE/LOVE_SONG
On since Aug 20 19:55:30 on tko from mother.and.father


