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To: FreeBSD-users-jp@jp.freebsd.org
From: Syuji Miyata <miyata@nd.net.fujitsu.co.jp>
In-Reply-To: Your message of "Thu, 14 May 1998 22:04:00 +0900"
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Date: Thu, 14 May 1998 22:56:09 +0900
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Subject: [FreeBSD-users-jp 28247] Re: Directed broadcast
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$B5\ED!wIY;NDL$G$9!#(B

Masato Minda <minmin@wide.ad.jp> $B$5$s$O=q$-$^$7$?!'(B

> $B0J2<$NDI2C$O$I$&$G$7$g$&$+!#(B(QandA$B$OH4$$$F$^$9(B)
> 
> Tahoe$B$J$I$N8E$$%$%s%W%j%a%s%H$G$O(BDirected Broadcast$B$rE>Aw$7$F$$(B
> $B$?$N$G!"(BFreeBSD$B$OBP:v$r$*$3$J$C$N$G$O$J$$$+$H;W$&$N$G$9$,(B($BL$3N(B
> $BG'(B)$B!#(B

$B$A$g$C$H8+$?$H$3$m!"(B4.4BSD $B$G$O!"(B
Directed Broadcast $B$rN.$7$F$$$k$h$&$K;W$$$^$9!#(B
FreeBSD $B$G$O!"$3$l$r4m81$H$7$F=$@5$5$l$?$N$G$O$J$$$G$7$g$&$+!#(B

$B$?$@!"40A4$K6X;_$9$k$N$G$O$J$/!"(BOpenBSD $B$J$I$N$h$&$K!"(B
$B=@Fp$KJQ99=PMh$?J}$,$$$$$H;W$&$1$I!"!"!"!#(B

> $B:G6a!"$3$l$rMxMQ$7$?%"%?%C%/$,$O$d$C$F$$$k$h$&$G$9!#(B

src_IP $B$r(B dst_IP $B$HF1$8$K=q$-49$($F!"(Bbroadcast ping $B$+$J$s$+(B
$BEj$2$?$i$9$4$$$3$H$K$J$j$=$&$G$9$M!#$^$"!"0-0U$,$J$$$H$=$s$J(B
$B$N$ON.$l$F$3$J$$$G$7$g$&$1$I!#$3$&$$$&$N$r9MN8$7$F=$@5$5$l$?$N(B
$B$+$b!#(B

> --$B$_$s$_$s(B
> 
> Minoru Oikawa wrote...
> >
> > Q: Directed broadcast $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

$BBP>]$N%5%V%M%C%H$KB0$9$kKvC<$N%k!<%?$K$H$C$F$O(B Directed Broadcast $B$G$9$,!"(B
$BESCf$N%k!<%?$K$H$C$F$O(B Directed $B$G$O$J$$$G$9!#(B

  $B""(B                                   $B"#(B
  $B!C(B    $B%k!<%?(B     $B%k!<%?(B    $B%k!<%?(B    $B!C(B
 --------$B!{(B---------$B!{(B---------$B!|(B------------
  netA       netB        netC       netD

$B!&C<Kv""$+$i(B netD $B$N%V%m!<%I%-%c%9%H(BIP$B%"%I%l%908$K%U%l!<%`$rEj$2$k$H!"(B
  $B!{$N%k!<%?$?$A$K$H$C$F$O!"(BDirected Broadcast $B$G$O$J$$$N$GCf7Q$7!"(B
  $B%(%s%I$N!|$N%k!<%?$K$H$C$F$O(B Directed Broadcast $B$J$N$GCf7Q$7$^$;$s!#(B

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

$B$=$N$h$&$G$9$M!#(B

---
miyata
