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To: FreeBSD-users-jp@jp.freebsd.org
From: Kenichi Okuyama <okuyama@trl.ibm.co.jp>
In-Reply-To: <20000313172007N.shibuya@urawa.cabletv.ne.jp>
References: <20000311012451Z.shibuya@urawa.cabletv.ne.jp>
	<20000313112142M.okuyama@trl.ibm.com>
	<20000313172007N.shibuya@urawa.cabletv.ne.jp>
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Subject: [FreeBSD-users-jp 50512] Re: Why is TCP_MSS size 512?
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$B1|;3(B@IBM$B$G$9!#(B

>>>>> "$B=BC+(B" == NAOHISA Shibuya <shibuya@urawa.cabletv.ne.jp> writes:
Samba-> Win(98|NT) $B$N>l9g!"=j!9!":FAw$O5/$C$F$$$k$h$&$G$9!#M}M3$OITL@(B
>> $B$G$9$,!"$*$=$i$/(B Windows $BB&$G<u?.$,4V$K9g$C$F$$$J$/$F!"%Q%1%C%H$r<N(B
>> $B$F$F$$$k$N$G$O$J$$$+!"$H!#$H$$$&$N$O!"FCDj$N%Q%1%C%H$r:FAw$9$k$H!"$0(B
>> $B$s$C$H$=$N@h$K?J$`$+$i$G$9!#(B
$B=BC+(B> $BIaDL(B($B$H$$$&(BRFC$BE*$K$O(B)$B!"(BTCP $B$O(B $B<u?.B&$,5v2D$7$?0J>e$N%G!<%?$OAw?.B&$K(B
$B=BC+(B> $BAw$j$^$;$s!#$D$^$j!"(BWin $B$J%^%7%s$N(B TCP $B$,(B FreeBSD $BB&$N(B TCP $B$K(B
$B=BC+(B> $B!V$3$l$3$l$@$1$N%G!<%?$O<u?.$G$-$^$9$h!W$H$$$C$F8@$C$F$*$$$F!"$=$l$r(B
$B=BC+(B> $B<u?.$G$-$J$$(B($B$H$j$3$\$9(B)$B$H$$$&$N$O$A$g$C$H$*$+$7$$$G$9$M(B($B:GBg=V4VIwB.E*(B
$B=BC+(B> $B$JB.EY$,Aa$9$.$F!"<u?.$G$-$J$$2DG=@-$O$"$j$^$9$,(B)$B!#(B

$B$*$=$i$/!"$G$9$,!#(B

TCP Window $B$,0\F0$7$F!V<u?.2DG=$JNN0h$,H/@8$9$k!W;~$H$$$&$N$O!"(B
Explorer $B$,%G!<%?$r5[$$=P$7$?$H$-$G$9$h$M(B?$B$=$ND>8e$K(B Explorer $B$,%G!<(B
$B%?$r%U%!%$%k$K=q=P$7$K9T$/$O$:$G$9!#2>$K$3$N%?%$%_%s%0$G%G!<%?$rAw?.(B
$B$5$l$?$i!"B?J,(B Windows $B$O<h$j$3$\$7$F$7$^$&$N$G$O$J$$$G$7$g$&$+(B?
#$B$"$$$D$O$m$/$J(B thread $B@Z$jBX$(%9%1%8%e!<%j%s%0$r$7$F$$$J$$$7!"3d$j(B
#$B9~$_%^%9%/$N$+$1$+$?$b0[>o$@$+$i!#(B

#$B$=$l$K(B Microsoft $B$,(B RFC $B$r$^$8$a$K<i$k$H$O;W$($^$;$s$7!D(B:p


$B=BC+(B> $B<B:]!"(BWin <-> Win $B4V$G$O!"@5>o$KAw?.$G$-$F$k$h$&$G$9$7!"2?$,5/$3$C$F(B
$B=BC+(B> $B$$$k$N$+$$$^$$$AFf$G$9!#(B

$B$3$l$OHf3SE*4JC1$J5$$,$7$^$9!#$h$&$9$k$K!V==J,$f$C$/$j$HAw?.$7$F$$$k!W(B
$B$N$G$7$g$&!#(B


$B=BC+(B> $B0l1~:FEY3NG'$J$N$G$9$,!"(BWin $B$H(B FreeBSD $B$J%^%7%s$OF10l$N(B Ethernet
$B=BC+(B> $B%;%0%a%s%H$K@_CV$7$F$"$k$N$G$9$h$M!)(B 

$B$O$$!#F1$8(B Hub $B$K7R$,$C$?(B3$B$D$N%^%7%s!"$H$$$&>uBV$G$9!#(B


$B=BC+(B> $B$^$?!"(Btcpdump $B$O$I$3$G<h$C$F$^$9$+!)(B

Samba $B$HDL?.$7$F$$$k$H$-$O!"(BFreeBSD 3.4 $B%^%7%s>e$G$9!#(BWin98 $B>e$G(B 
WinDump $B$rF0$+$9$H!"DL?.B.EY$,$5$i$K$,$?Mn$A$K$J$k!"$H$$$&;v<B$,H=$j(B
$B$^$7$?$N$G!"(BWin98 $B$+$i$O(BWinDump $B$O30$7$F$"$j$^$9!#(B

NT<->Win98 $B$N>l9g$O(B NT $BB&$G(B WinDump $B$rF0$+$7$F$$$^$9!#(B


$B=BC+(B> $B$b$7!"(BWin $B$H(B FreeBSD $B$J%^%7%s$HF10l%;%0%a%s%H$K$"$kBh(B3$B<TE*$J%^%7%s$G(B
$B=BC+(B> tcpdump $B$r<h$C$F$$$J$$$J$i!"$=$3$G$b$&0lEY(B tcpdump $B$r<h$j$J$*$7$F!"(B
$B=BC+(B> $B>/$J$/$H$b(B FreeBSD $B$NAw?.;~E@$G$O%Q%1%C%H%m%9$,5/$-$F$$$J$$$3$H$r(B
$B=BC+(B> $B3NG'$7$?J}$,$h$$$H;W$$$^$9!#$=$N7k2L!"(BWin98 $B$,<h$j$3$\$7$F$$$k2DG=@-(B
$B=BC+(B> $B$,Bg$-$/$J$j$^$9!#(B

Switching Hub $B$G$O!VB>$N%^%7%s!W$NDL?.$OGA$1$J$$$N$G!"$=$NJ}K!$OD|$a(B
$B$^$7$?!#(B
---- 
$B1|;3(B $B7r0l(B@$BEl5~4pAC8&5f=j(B.$BF|K\(BIBM($B3t(B)[$BFzLn(BFC:No.0000000015]
#URL  http://www.dd.iij4u.or.jp/~okuyamak/
#$B:#F|$N$*8@MU!X$F$sCc!Y(B:$B@e4E(B $BCc$H$$$&;z$,$J$$$N$M!D!#(B
