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Date: Fri, 15 May 1998 14:14:39 +0900 (JST)
From: Minoru Oikawa <mino@bb.imagica.co.jp>
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Subject: [FreeBSD-users-jp 28292] Re: Directed broadcast
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> Date: Thu, 14 May 1998 21:36:10 +0900 (JST)
> From: Minoru Oikawa <mino@bb.imagica.co.jp>

>  $B$*$$$+$o$G$9!#$^$H$aD>$7$F(B QandA $B$KAw$k;v$K$7$^$7$?!#(B
>  $B!VJQ$@D>$;!W%a!<%k$r4?7^$7$^$9!#(B 

 $BB?$/$N8f0U8+!"$"$j$,$H$&$4$6$$$^$7$?!#$h$jNI$$%b%N$K=PMh$?(B
$B$H;W$$$^$9!#(B
 QandA $B$K:9$7BX$($r0MMj$9$kA0$K!":FEY(B users-jp $B$KN.$7$F!"3'(B
$B$5$s$N8f;XE&$J$I$,$-$A$s$HH?1G$5$l$F$$$k$+!"8+$F$*$$$FD:$3$&(B
$B$H;W$$$^$9!#(B

 $BK\F|$N(B 16:30 $B:"$^$GBT$C$F!"(BQandA $B$K:FEYAw$C$F$*$-$^$9!#(B

--- BEGIN --- BEGIN --- $B$3$3$+$i(B

Q: $B%k!<%?$r:n$j$^$7$?!#%V%m!<%I%-%c%9%H$OE>Aw$7$F$/$l$J$$$N$G$9$+(B?

A: $B<+J,$NB0$7$F$$$k%M%C%H%o!<%/08$N$O!"$7$F$/$l$^$;$s!#(B

 Limited broadcast $B$,E>Aw$5$l$J$$$N$O!"$=$&M-$k$Y$-$J$N$GNI(B
$B$$$N$G$9$,!"(BDirected broadcast $B$,E>Aw$5$l$J$$$N$O8=:_$N<BAu(B
$B$N@)8B$G!"2~A1$5$l$k$Y$-$G$7$g$&!#(B

 FreeBSD-2.1 $B7O$N:"$O%+!<%M%k%*%W%7%g%s$N(B
	options DIRECTED_BROADCAST
$B$r;XDj$9$k;v$GF0:n$rA*$Y$?$h$&$G$9!#(B
[$B2TF/$O(B 2.1.7.1R $B$N$_3NG'(B, ML: FreeBSD-users-jp 28263]

 FreeBSD-2.2 $B7O$G$O!"$3$N%*%W%7%g%s$H$=$l$K78$o$k%3!<%I$O:o(B
$B=|$5$l$F$$$k$h$&$G$9!#(B

 NetBSD, OpenBSD $B$N%=!<%9$r8+$k$H!"$=$l$i$G$O2~A1$5$l$F$$$F!"(B
sysctl(8) $B$GF0:n$rA*$Y$k$h$&$G$9!#(B
[$BF0:n$OL$3NG'(B]


Q: Limited broadcast $B$C$F$J$s$G$9$+(B?

A: $B08@h$,(B 255.255.255.255 $B$K$J$C$F$$$k%V%m!<%I%-%c%9%H$G$9!#(B

 $BAw?.$7$?%[%9%H$,B0$7$F$$$k%M%C%H%o!<%/Fb$N$_$KN.$9$H$$$&$*(B
$BLsB+(B(rfc1812)$B$G$9!#(B


Q: Directed broadcast $B$C$F$J$s$G$9$+(B?

A: $B08@h$,(B 10.255.255.255 $B$J$I$H!"%M%C%H%o!<%/%"%I%l%9$r;XDj(B
$B$7$F$$$k7A<0$N%V%m!<%I%-%c%9%H$G$9!#(B

 $B$A$J$_$K!"$3$l$r<B:]$K%V%m!<%I%-%c%9%H$@$HG'<1$7$F!"J*M}AX(B
$B$N%V%m!<%I%-%c%9%H$H$7$FN.$9$N$O!"08@h$N%M%C%H%o!<%/$K78$o$C(B
$B$F$$$k%k!<%?$G$9!#7PO)$NESCf$N%k!<%?$O%V%m!<%I%-%c%9%H%"%I%l(B
$B%9$+$I$&$+H=Dj$G$-$J$$$N$G!"%f%K%-%c%9%H07$$$GDL?.$7$^$9!#(B

 $B$^$?!"$3$l$,0[$J$k%M%C%H%o!<%/4V$G5!G=$9$k$+$I$&$+$O!"$=$N(B
$B%M%C%H%o!<%/4V$NDL?.$K$+$+$o$C$F$$$k:G=*C<$N%k!<%?$N@_Dj(B($B$d!"(B
$B$^$l$K<BAu$N@)8B(B)$B$K0MB8$7$^$9!#(B
 Directed broadcast$B$rE>Aw$9$k$H!"(BDoS attack$B$N85$K$J$k$?$a!"(B
$B:G6a$OE>Aw$7$J$$!"$"$k$$$OE>Aw$9$k$+$I$&$+$rA*$Y$k$h$&@_Dj$G(B
$B$-$k$b$N$,$U$($D$D$"$j$^$9!#(B

--- END --- END --- $B$3$3$^$G(B

--- mino
