From owner-FreeBSD-net-jp@jp.freebsd.org  Thu Nov 11 07:50:14 1999
Received: (from daemon@localhost)
	by castle.jp.freebsd.org (8.9.3+3.2W/8.7.3) id HAA60090;
	Thu, 11 Nov 1999 07:50:14 +0900 (JST)
	(envelope-from owner-FreeBSD-net-jp@jp.FreeBSD.org)
Received: from seagull.nemoto.ecei.tohoku.ac.jp (seagull.nemoto.ecei.tohoku.ac.jp [130.34.199.68])
	by castle.jp.freebsd.org (8.9.3+3.2W/8.7.3) with ESMTP id HAA60085
	for <FreeBSD-net-jp@jp.FreeBSD.org>; Thu, 11 Nov 1999 07:50:13 +0900 (JST)
	(envelope-from koto@nemoto.ecei.tohoku.ac.jp)
Received: from localhost (localhost [127.0.0.1])
	by seagull.nemoto.ecei.tohoku.ac.jp (8.9.3/3.7W/99021305) with ESMTP id HAA05643
	for <FreeBSD-net-jp@jp.FreeBSD.org>; Thu, 11 Nov 1999 07:51:08 +0900 (JST)
To: FreeBSD-net-jp@jp.FreeBSD.org
From: Toshihide KONNO<koto@nemoto.ecei.tohoku.ac.jp>
X-Mailer: Mew version 1.94.1 on Emacs 19.34 / Mule 2.3 (SUETSUMUHANA)
Mime-Version: 1.0
Content-Type: Text/Plain; charset=iso-2022-jp
Content-Transfer-Encoding: 7bit
Message-Id: <19991111075108R.koto@nemoto.ecei.tohoku.ac.jp>
Date: Thu, 11 Nov 1999 07:51:08 +0900 (JST)
X-Dispatcher: imput version 991025(IM133)
Lines: 67
Reply-To: FreeBSD-net-jp@jp.freebsd.org
Precedence: list
X-Distribute: distribute version 2.1 (Alpha) patchlevel 24e+990727
X-Sequence: FreeBSD-net-jp 2079
Subject: [FreeBSD-net-jp 2079] smurf relay
Errors-To: owner-FreeBSD-net-jp@jp.freebsd.org
Sender: owner-FreeBSD-net-jp@jp.freebsd.org
X-Originator: koto@nemoto.ecei.tohoku.ac.jp

$BElKLBg3X>pJs2J3X8&5f2J$N:#Ln$H?=$7$^$9!#(B

$BF|!9%;%-%e%j%F%#%[!<%k$rDY$9EXNO$r$5$l$F$$$kJ}!9$,$$$i$C$7$c$kCf!"(B
$B$3$s$J$3$H$rJ9$/$N$O?=$7Lu$J$$5$$,$9$k$N$G$9$,(B...

$B8=:_!"(B

    _______________
    |192.168.0.0/24|   $B%5%V%M%C%H(B0
    |______________|
           |
      _____|de0:192.168.0.1
     |           |    
     |___________|     gateway(FreeBSD3.3R)
           |fxp0:192.168.1.1
    _______|________     
    |192.168.1.0/24|
    |______________|     $B%5%V%M%C%H(B1
           |   

$B$H$$$&%M%C%H%o!<%/$r:n$C$F$$$^$9!#(B

smurf$B$N1F6A$rD4$Y$k<B83$r$9$k$?$a$K!"(B
gateway$B$G(Bsmurf$B$NCf7Q$r9T$&$h$&$K@_Dj$7$?$$$N$G$9!#(B
$B$D$^$j!"(B
$B%5%V%M%C%H(B2$B$+$i%5%V%M%C%H(B1$B$N(Bbroadcast$B%"%I%l%9(B(192.168.1.255)
$B$KEj$2$k(Bping$B$rDL$k$h$&$K$7$?$$!"$H$$$&$3$H$J$N$G$9$,!"(B
$B$&$^$/9T$+$:$KG:$s$G$$$^$9!#(B

$B!t$b$A$m$s!"0-0U$,$"$C$F$d$C$F$k$o$1$8$c$J$$$G$9!#(B


<$B$d$C$?$3$H(B>
1.routed$B$rMQ$$$F!"(B
 ($B%5%V%M%C%H(B0$BCf$N(B1$B%[%9%H(B)<-->($B%5%V%M%C%H(B1$BCf$N(B1$B%[%9%H(B)
 $B$NDL?.$O2DG=$J>uBV$K$"$j$^$9!#(B

>koto@192.168.0.3 % ping 192.168.1.8
>PING 192.168.1.8 (192.168.1.8): 56 data bytes
>64 bytes from 192.168.1.8: icmp_seq=0 ttl=64 time=2.186 ms
>64 bytes from 192.168.1.8: icmp_seq=1 ttl=64 time=1.177 ms


2.http://ganko.eps.nagoya-u.ac.jp/~kato/FreeBSD/FreeBSD-CERT/advisory/FreeBSD-SA-98%3A06.icmp.asc
  $B$r;29M$K$7$F!"(Bpatch$B$r5U$K$"$F(B(^^; $B!"$^$?(B
  % sysctl -w net.inet.icmp.bmcastecho=1
  $B$H@_Dj$7$^$7$?!#(B


$B$7$+$7!"%5%V%M%C%H(B0$B$N%^%7%s$+$i(Bping$B$r$+$1$F$b!"(B

>% ping 192.168.1.255
>PING 192.168.1.255 (192.168.1.255): 56 data bytes
>64 bytes from 192.168.1.1: icmp_seq=0 ttl=255 time=0.228 ms
>64 bytes from 192.168.1.1: icmp_seq=1 ttl=255 time=0.181 ms

$B$H$J$C$F$7$^$$!"%5%V%M%C%H(B1$B$NFbIt$^$G(Bping$B$,E~C#$7$^$;$s!#(B
$B$I$N$h$&$K$9$l$P!"%5%V%M%C%H(B0$B$N%[%9%H$O%5%V%M%C%H(B1$B$N(Bbroadcast$B$X$N(Bping$B$r(B
$BEj$2$k$h$&$K$G$-$k$G$7$g$&$+!)(B


$BJQ$JAjCL$@$H$*$b$$$^$9$,!"%"%I%P%$%9$rD:$1$l$P$H;W$$$^$9!#(B
$B$h$m$7$/$*4j$$$7$^$9!#(B
-----------------------
$BElKLBg3X>pJs2J3X8&5f2J>pJsEAC#3X8&5f<<(B M1
$B:#Ln(B $BIR=((B(Toshihide KONNO)
koto@nemoto.ecei.tohoku.ac.jp
