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Message-ID: <3C91AA35.4090208@pop13.odn.ne.jp>
Date: Fri, 15 Mar 2002 17:00:53 +0900
From: Isamu Kanakubo <kanakubo@pop13.odn.ne.jp>
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Subject: [FreeBSD-net-jp 3597] Re: PPPoE =?ISO-2022-JP?B?GyRCJE4bKEI=?=
 ftp 	=?ISO-2022-JP?B?GyRCJE4/NiRrSXEkJBsoQg==?= 
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$B6b5WJ]$G$9!#(B

$B%"%I%P%$%9$"$j$,$H$&$4$6$$$^$9!#(B

$B7k2L$+$i?=$7$^$9$H!"(Bftp$B$bLdBj$J$/$J$j$^$7$?!#(B
$B860x$O(B

> dc0: <ADMtek AN985 10/100BaseTX> 

$B$G$7$?!#(B

$B%O!<%I$r5?$&;v$O@UG$E>49$C$]$/$F$$$d$@$C$?$s$G$9$,!"(Bed$B$H(Bdc$B$r8r49$7$?$i0l(B
$BH/(BOK$B$G$7$?!#$3$s$J;v$b$"$k$s$G$9$M$'!&!&!&$H$$$&$H$3$m$G=*$o$j$K$7$^$9!#(B

$B$"$^$j:,5r$N$J$$OC$G$9$,!"(BNIC$B$O$$$$$b$N$rGc$C$?$[$&$,$$$$$G$9!#(B1.5M$B$N(B
ADSL$B$@$+$i$=$s$J$K%Q%U%)!<%^%s%9$,$G$J$/$F$b$$$$$d!*$H;W$C$F$$$?$N$G$9(B
$B$,!"$^$5$+$3$s$J8=>]$,$G$k$H$O!&!&!&%H%[%[$G$9!#(B

$BBg@N$O(B3COM$B$N(B3C589$B$H$+(BIntel$B$N(BEhterExpress$B$H$+$rA*$s$GGc$C$F$$$?$N$G$9$,L}(B
$BCG$7$F$$$^$7$?!#(B

$B?9$5$s!"@>K\$5$s$"$j$,$H$&$4$6$$$^$7$?!#(B

$B0J>e!"$h$m$7$/$*4j$$$7$^$9!#(B

Mori Kouji wrote:

> $B?9$G$9!#(B
> 
> Isamu Kanakubo <kanakubo@pop13.odn.ne.jp> writes:
> 
> 
>>/usr/src/usr.sbin/ppp/tcpmss.c$B$r(BMAXMSS$B$C$F%^%/%m$rD>CM$G(B1000$B$H$+$K$7$F$_(B
>>$B$?$N$G$9$,!"$=$l$G$b%@%a$G$7$?!#(B1000$B$^$G2<$2$l$P%V%i%C%/%[!<%k%k!<%?!<$b(B
>>$BJ86g$r$$$o$J$$$H;W$&$N$G$9$,!"$I$&$G$7$g$&$+!)(B
>>
> 
> $BKM$,CN$C$F$k(B PPPoE $B$,$i$_$NLdBj$O(B 3 $B$D$G$9!#(B
> 
>   1. PPP packet $B$N:GBg%5%$%:$r%+%W%;%k2=$9$k$H(B ether frame $B$N>e8B$J$I$r(B
>      $B1[$($F$7$^$&!#$3$N>l9gAj<j$K$h$i$:DL?.>c32$,H/@8$9$k!#(B
> 
>   2. $B7PO)$N$&$A!"(BPPPoE $B$NItJ,$,B>$N$H$3$m$h$j(B MTU $B$,>.$5$$$?$a!"(B
>      path MTU discovery $B$K>c32$,$"$k$H82:_2=$7$d$9$$!#(B
>      $BFCDj$N7PO)$rDL2a$9$k>l9g(B($B$3$A$i$+$i$OFCDj$NAj<j$N$h$&$K8+$($k(B)$B$K(B
>      $B$N$_>c32$,H/@8$9$k!#(B
> 
>   3. $B7PO)$N$&$A!"(BPPPoE $B$NItJ,$,B>$N$H$3$m$h$j(B MTU $B$,>.$5$$$?$a!"(B
>      $B$=$NItJ,$G(B fragment $B2=$5$l$d$9$$!#FCDj$N(B OS (?) $B$N>l9g$K(B
>      $B>c32$,H/@8$9$k!#(Bfragment $B2=$5$l$?%Q%1%C%H$OFO$/$N$G(B
>      $B$3$A$i$,(B fragment $B2=$5$l$?%Q%1%C%H$r<N$F$J$1$l$PDL?.$O2DG=!#(B
> 
> $B$$$o$f$k%V%i%C%/%[!<%k%k!<%?LdBj$O(B 2 $B$KAjEv$7$^$9!#(B
> 
> # $B6b5WJ]$5$s$N$O>e$N(B 3 $B$D$N$I$l$H$b0[$J$k$h$&$K8+$($^$9!#(B
> 
> $B$=$l$>$l$NBP:v$O0J2<$N$h$&$K$J$j$^$9!#(B
> 
>   1. $B$"$i$+$8$a(B MTU $B$r>.$5$/$7$F$*$/!#(B(set max mtu $B$r@_Dj$9$k(B)
> 
>   2. MSS $B$rESCf$G=q$-49$($F!"(BPPPoE $B@\B3$rDL2a$G$-$k%5%$%:0J2<$N(B
>      $B%5%$%:$N%Q%1%C%H$7$+Aw$i$J$$$h$&$K$9$k!#(B(4.4R $B0J9_$N(B ppp(8) $B$G$O(B
>      $B%G%U%)%k%H$H$J$C$F$$$k(B)
> 
>   3. TCP $B$K%*%W%7%g%s%X%C%@$r4^$a$J$$$h$&$K$9$k$+(B MSS $B$r$b$C$H>.$5$/$9$k!#(B
> 
> 3 $B$,5/$-$k>r7o$O$+$J$jFC<l$G!"(B
> 
>     i. $BAj<jB&$,(B path MTU discovery $B$r;H$C$F$*$i$:!"(B
>    ii. $B$3$A$i$,DLCN$7$?(B MSS $B$N%5%$%:$$$C$Q$$$N%Q%1%C%H$r(B
>   iii. fragment $B2=6X;_%U%i%0(B (DF) $B$r$D$1$J$$$GAw$C$F$/$k(B
> 
> $B$H$$$&>l9g$KH/@8$9$k$H9M$($i$l$^$9!#IaDL$O(B path MTU discovery $B$r(B
> $B;H$C$F$J$1$l$P:G>.%5%$%:$N%Q%1%C%H$rAw$k$N$G>c32$O=P$^$;$s!#(B
> (path MTU discovery $B$r;H$C$F$$$k$J$i(B DF $B$r$D$1$FAw$C$F$/$k$O$:$G$9(B)
> $BAj<j$,(B DF $B$D$1$?%Q%1%C%H$rAw$C$F$/$k$N$G$"$l$P!"(BICMP $B%(%i!<$,JV$k$N$G(B
> ($BJV$i$J$$$N$,%V%i%C%/%[!<%k%k!<%?LdBj(B) $BAj<j$,$J$s$H$+$9$k$O$:!#(B
> 
> 


-- 
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$B6b5WJ]!!M&(B            kanakubo@pop13.odn.ne.jp
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