From owner-IPv6-jp@jp.FreeBSD.org Fri Apr 12 20:16:16 2002
Received: (from daemon@localhost)
	by castle.jp.FreeBSD.org (8.11.6+3.4W/8.11.3) id g3CBGGP05089;
	Fri, 12 Apr 2002 20:16:16 +0900 (JST)
	(envelope-from owner-IPv6-jp@jp.FreeBSD.org)
Received: from shuttle.wide.toshiba.co.jp (shuttle.wide.toshiba.co.jp [3ffe:501:100f:0:200:f8ff:fe01:61cf] (may be forged))
	by castle.jp.FreeBSD.org (8.11.6+3.4W/8.11.3) with ESMTP/inet6 id g3CBGFv05083
	for <IPv6-jp@jp.FreeBSD.org>; Fri, 12 Apr 2002 20:16:15 +0900 (JST)
	(envelope-from jinmei@isl.rdc.toshiba.co.jp)
Received: from localhost ([3ffe:501:4819:2000:200:39ff:fed9:21d7])
	by shuttle.wide.toshiba.co.jp (8.11.6/8.9.1) with ESMTP id g3CBGFo72956
	for <IPv6-jp@jp.FreeBSD.org>; Fri, 12 Apr 2002 20:16:15 +0900 (JST)
Date: Fri, 12 Apr 2002 20:16:13 +0900
Message-ID: <y7v1ydl5fr6.wl@ocean.jinmei.org>
From: JINMEI Tatuya / =?ISO-2022-JP?B?GyRCP0BMQEMjOkgbKEI=?=
 <jinmei@isl.rdc.toshiba.co.jp>
To: IPv6-jp@jp.FreeBSD.org
In-Reply-To: <200204121046.TAA05584@mosel.vrl.mei.co.jp>
References: <20020412.180047.59465438.jinmei@ocean.jinmei.org>
	 <200204121046.TAA05584@mosel.vrl.mei.co.jp>
User-Agent: Wanderlust/2.6.1 (Upside Down) Emacs/21.1 Mule/5.0 (SAKAKI)
Organization: Research & Development Center, Toshiba Corp., Kawasaki, Japan.
MIME-Version: 1.0 (generated by SEMI 1.14.3 - "Ushinoya")
Content-Type: text/plain; charset=ISO-2022-JP
X-Dispatcher: imput version 20000228(IM140)
Lines: 77
Reply-To: IPv6-jp@jp.FreeBSD.org
Precedence: list
X-Distribute: distribute version 2.1 (Alpha) patchlevel 24e+020409
X-Sequence: IPv6-jp 1042
Subject: [IPv6-jp 1042] Re: Path MTU discovery
Errors-To: owner-IPv6-jp@jp.FreeBSD.org
Sender: owner-IPv6-jp@jp.FreeBSD.org
X-Originator: jinmei@isl.rdc.toshiba.co.jp

>>>>> On Fri, 12 Apr 2002 19:46:31 +0900 (JST), 
>>>>> Mitani Hiroshi <hmitani@vrl.mei.co.jp> said:

> $B!t;d(B($B;0C+(B)$B$,$I$&;W$&DxEY$NOC$G$9$+$i!"$b$7!";d$N=q$-J}$,5$$K?($k$h$&$G(B
> $B!t$7$?$i$4$a$s$J$5$$!#(B

$B$$$($$$(!"$H$s$G$b$"$j$^$;$s!#$*$+$2$G$A$g$C$H5sF0$,$*$+$7$$$H$3$m$r8+(B
$B$D$1$i$l$^$7$?!#(B

>> > $B$=$l$KHf$Y$k$H!"(BFreeBSD-4.5 $B$N5sF0$O>/$7A4BNE*$K@09g@-$,$H$l$F$$$J$$(B
>> > $B$h$&$K46$8$i$l$^$9!#(B
>> 
>> $B$I$N$h$&$J0UL#$G@09g@-$,<h$l$F$$$J$$$H$*46$8$K$J$C$?$N$+$O$h$/$o$+$j$^(B
>> $B$;$s$,(B(b$B$NLdBj$G$7$g$&$+!)(B)$B!"%$%s%?%U%'!<%9$N(BMTU $B$r(BIPv6 minimum link
>> MTU$B$h$j>.$5$/$7$?$H$-$K$I$&$"$k$Y$-$+$N9M;!$r$"$^$j$7$F$$$J$$$H$$$&0U(B
>> $BL#$G$O$4;XE&$NDL$j$+$H;W$$$^$9!#(B

> $B$A$g$C$HITE,@Z$JI=8=$G$7$?!#(B
> interface MTU $B$r(B 1280 $B0J2<$K$7$h$&$H$7$?$H$-!"Nc$($P!"BEEv$J=hM}$H$7$F(B

> 1) IPv6$BE*$K$O%$%s%?!<%U%'%$%9<+BN$,5!G=Dd;_(B
> 2) IPv6$BE*$KL5;k(B(IPv4 $BE*$K$O;XDj$7$?(BMTU$BCM$X!"(BIPv6$BE*$K$O0JA0$N(BMTU$BCM$N$^$^(B)
> 3) $BL5;k(B(IPv6$B$N7PO)$H$7$F@8$-$F$$$k(B intaface $B$KBP$9$kITEv$J@)8f$H$7$F!"(B
>    $B;XDj<+BN$rL5;k!#(Bdevice busy $BE*BVEY(B)

> $B$J$I$,!";d$K$O;W$$Ib$+$S$^$7$?!#(BFreeBSD-4.5 $B$N5sF0$O$=$NHO0O30$@$C$?$H(B
> $B$$$&$3$H$G$9(B($BC1$K<g4Q$NLdBj$K2a$.$^$;$s$M!#$9$$$^$;$s(B)$B!#(B

$B0JA0$N$^$^$N$D$b$j$@$H!"7k6I2<$2$?(BMTU$B$rD6$($k%G!<%?$rE>Aw$G$-$J$$$N$G!"(B
2$B$d(B3$B$H$$$&$o$1$K$O$$$+$J$$$G$7$g$&$M!#(B1.$B$+!"(B
4) $B>.$5$$(BMTU$B$J$j$K$J$s$H$+;H$$B3$1$k(B($B$$$^$N(BBSD$B$O!"$"$^$j9M$($F$J$$7k2L(B
   $B$H$7$F$3$l$K$J$C$F$$$k(B)
$B$+$J$H;W$$$^$9$,!"%[%9%H$G!"B>$K%$%s%?%U%'!<%9$,$J$$$h$&$J>l9g$J$i%@%a(B
$B$b$H$G(B4)$B$b$"$jF@$k$G$7$g$&$1$I!"%k!<%?$N>l9g$K$O0-1F6A$NJ}$,Bg$-$=$&$J(B
$B$N$G!"(B1.$B$,$h$5$=$&$J5$$O$7$F$$$^$9!#(B

$B$?$@$7$3$N>l9g$K!"%"%I%l%9$^$GGm$,$9$N$,$$$$$N$+$I$&$+$"$?$j$O9M$($,J,(B
$B$+$l$k$H$3$m$+$J$H;W$$$^$9!#(B

>> $B$9$_$^$;$s!"!V(B(udp$B$O%@%a$J$N$K(B)ping6$B$,DL$k!WJ}$K$D$$$F$N@bL@$rA0$N%a!<(B
>> $B%k$G$O=q$-K:$l$F$$$^$7$?!#!VDL$k!W$N0UL#$,L@3N$G$J$$$N$G!"%Q%1%C%H%@%s(B
>> $B%W$G$b8+$J$$$H3N>Z$O;}$F$^$;$s$,!"<B:]$K$O!"(BUDP$B$b!VDL$C$F!W$O$$$k$N$G(B
>> $B$O$J$$$+$H;W$C$F$$$^$9!#(BBSD$B$G$O!"%Q%1%C%H$rE>Aw$9$k$H$-$K;2>H$9$k(BMTU$B$H(B
>> $B$7$F$O!"!V(BIPv6$BE*(BMTU$B!W$G$O$J$/%$%s%?%U%'!<%9$N(BMTU$B$rMxMQ$7$F$$$k$+$i$G$9!#(B
>> $B!V(BUDP$B$,DL$i$J$$!W$h$&$K8+$($k$N$O!"(BUDP$B$N>l9g$K$O(Bicmp6 error$B$rJV$=$&$H(B
>> $B$7$?;~E@$G<:GT$7$F!"$=$l$h$j@h$K?J$^$J$$$h$&$K8+$($k$+$i$G$O$J$$$G$7$g(B
>> $B$&$+!)(B

> $B$=$&$+$b$7$l$^$;$s!#(B

> $B%k!<%?$H$7$F$N(B FreeBSD$B5!$NN>B&$N%$%s%?!<%U%'%$%9$r(B FreeBSD $B5!>e$+$i(B
> tcpdump $B$G4Q;!$9$k$H!"(B($B5-21$G=q$$$F$$$k$N$G!"IT@53N$+$b$7$l$^$;$s!#(B)

>     sorce $BB&(B                |        destination $BB&(B
> ----------------------------+-----------------------------------
--> ICMP6 echo request      |          ICMP6 echo request   -->        
> <-- ICMP6 echo response     |          ICMP6 echo response  <--        
>                             |
--> UDP                     |        who has DEST-HOST-ADDR -->
>                             | who has DEST-SIDE-ROUTER-ADDR <--
--> UDP                     |
--> UDP                     |
--> UDP                     |

> destination $BB&$G$O(B UDP $B$O4QB,$5$l$^$;$s$7!"(Bsource$BB&$K$D$$$F$O!"(BICMP$B$N(B
> unreach $B$b(B too big $B$b4QB,$5$l$^$;$s$G$7$?!#(B

$B$3$N$H$-$N(BUDP$B$N%Q%1%C%H$O!"(Bdestination$BB&$KE>Aw$5$l$k$O$:$N%5%$%:$J$N$G(B
$B$7$g$&$+!)(Bdestination$BB&(BMTU$B$rD6$($F$$$F!"(Bicmp error$B$rJV$=$&$H$7$F$$$k(B
($B$G$b$=$l$,<:GT$7$F$$$k(B)$B$N$G$O$J$$$+$HA[A|$7$F$$$?$N$G$9$,!D(B

$B$b$7$bE>Aw$5$l$k$Y$-%Q%1%C%H$,<N$F$i$l$F$$$k$N$@$H$7$?$i!"$4;XE&$N$h$&(B
$B$J(BUDP$B0MB8$N%P%0$J$N$+$b$7$l$^$;$s!#(B

				$B?@L@(B $BC#:H(B (jinmei@isl.rdc.toshiba.co.jp)
				$B3t<02q<R(B $BEl<G(B  $B8&5f3+H/%;%s%?!<(B
				$BDL?.%W%i%C%H%[!<%`%i%\%i%H%j!<(B
