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In-Reply-To: Your message of "Sun, 16 Mar 2003 11:31:04 +0900".
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From: yama@netlab.is.tsukuba.ac.jp (Daisuke Yamazaki)
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Date: Sun, 16 Mar 2003 15:45:28 GMT
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Date: 17 Mar 2003 00:45:28 +0900
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Subject: [FreeBSD-users-jp 73766] Re: PrivateLAN
	=?ISO-2022-JP?B?GyRCPmUkTiVeJTclcyQrJGkkThsoQg==?= PortOpen
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$B$3$s$K$A$O!"(B

$B$*!<$?$/$s(B wrote: 

> $B!!$3$s$K$A$O!"1n4]$G$9!#(B
> 
> 2003-03-16($BF|(B) 08:53:49.$B:"!"(Byama@netlab.is.tsukuba.ac.jp$B$5$s$O=q$-$^$7$?!#(B
> 
> > $B8=:_(BPrivateLAN$B>e$N%^%7%s$+$i30It$N%M%C%H%o!<%/$K(B
> > $B%V%m!<%I%P%s%I%k!<%?(B(BLW-04FM)$B$N(BNAT$B5!G=$r2p$7$F(B
> > $B@\B3$7$F$$$k$N$G$9$,!"30It$N%[%9%H$KBP$7$F(BPing$B$O(B
> > $BJV$C$F$/$k$,!"(B80$B$J$I$N%5!<%S%9$K%"%/%;%9$7$h$&$H(B
> > $B$9$k$H(BPort$B$N%*!<%W%s$,6KC<$KCY$$(B(30$BIC0J>e$+$+$k(B)
> > $B$H$$$&8=>]$KAx$C$F$^$9(B.
> 
> $B!!$H$j$"$($:(B tcpdump $B$J$j(B ethereal $B$J$j$G!"$I$N$h$&$J%Q%1%C%H$,(B
> $BN.$l$F$$$k(B/$BN.$l$F$$$J$$$H$$$&$N$r3NG'$7$F$_$F$O$I$&$G$7$g$&$+!#(B
> $B$J$s$H$J$/(B DNS $B$N(B timeout $BBT$A$,5/$-$F$$$k$h$&$J5$$,$7$^$9$,!"(B
> ping $B$G$O$U$D$&$KL>A02r7h$G$-$F$$$k$N$G$9$h$M!D!D!#(B

tcpdump$B$G$N2r@O$J$I$$$m$$$m;n$7$F$_$?7k2L!"(BBroad
Band$B%k!<%?$KFbB"$5$l$F$$$k(BDNS$B%5!<%P$,(BFreeBSD$B$+$i$N(B
$BLd$$9g$o$;$KBP$7$F$J$<$+$H$F$bCY$$$N$G$O(B?$B$H$$$&M=A[(B
$B$KC#$7$^$7$?(B.$B$=$&H=CG$7$?M}M3$O(BDNS$B%5!<%P$r(BBroadBand
$B%k!<%?FbB!$N(BDNS$B$G$J$/!"%W%m%P%$%@$+$iDs6!$5$l$F$$$k(B
DNS$B$r(BBroadBand$B%k!<%?$r2p$7$FLd$$9g$o$;$k$h$&$K$9$k$H(B
$BLdBj$J$/DL?.$,$G$-$k$h$&$K$J$C$?$+$i$G$9(B.

# $B$3$l$K4X$7$F$O(BPlanex$B$NJ}$KLd$$9g$o$;Cf$G$9(B.

> > http://www.jp.freebsd.org/QandA/HTML/1622.html
> > 
> > $B$3$N$"$?$j$NOC$+$H;W$$!"%+!<%M%k%3%s%Q%$%k$r(B
> > $B9T$C$F$_$?$N$G$9$,!">u67$O2~A1$7$^$;$s(B.
> 
>   $B$3$l$O4{$K@NOC$K$J$C$F$$$k$O$:$G$9!#(B
> http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/i386/i386/in_cksum.c#rev1.17.2.2

$B$J$k$[$I(B.$B;29M$K$J$j$^$7$?(B.

> $B!!(Bchecksum $B$G%(%i!<$K$J$C$F$$$l$P!"%Q%1%C%H$r<u$1<h$C$F$b(B ACK $B$r(B
> $BJV$7$F$$$J$$!"$G$$$$$s$G$7$?$C$1!#(BICMP $B$rJV$9$s$@$C$?$+K:$l$^$7(B
> $B$?$,!"$3$NJU$O$-$C$H$d$^$6$-$5$s$NJ}$,>\$7$$$O$:(B :)

$B$b$&$b$O$d@N<h$C$?%-%M%E!<$/$s>uBV$J$N$G$9$,!"(B:-)

$B$O$:$7$F$$$k$d$b$G$9$,!"$*$=$i$/>e5-%3!<%I$O(BTCP
$B%X%C%@$K8B$i$J$$%M%C%H%o!<%/%X%C%@HFMQ$N%A%'%C%/(B
$B%5%`%A%'%C%/%3!<%I$@$H;W$$$^$9(B.

$B$^$?(Bchecksum$B$O(BTCP$B%X%C%@$K8B$i$:!"(BIP,ICMP,UDP$B$N(B
$B%X%C%@$J$I$K$b$"$k$N$G!"(BChecksum$B%(%i!<$9$J$o$A(B
ICMP$B$rJV$9$H$$$&OC$K$O$J$i$J$$$H;W$$$^$9(B.$BNc$($P(B
ICMP$B$O(BIP$B$N>e0L$GF0$/%W%m%H%3%k$J$N$G!"(BIP$B%X%C%@(B
$B$N(BCheckSum$B$,<:GT$9$k$H(B($BDL?.O)$,3NJ]$5$l$F$J$$(B
$B$3$H$K$J$k$N$G(B),ICMP$B$rEj$2$k$3$H$9$i$G$-$J$$(B
$B$G$7$g$&(B.

$B$=$l$G$O!#(B

$B$d$^$6$-(B
