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From: Mitani Hiroshi <hmitani@vrl.mei.co.jp>
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In-Reply-To: <20020412.180047.59465438.jinmei@ocean.jinmei.org> from "JINMEITatuya/
 =?ISO-2022-JP?B?GyRAGyRCP0BMQEMjOkgbKEI=?=" at "Apr 12, 2002  6: 0:47 pm"
To: IPv6-jp@jp.FreeBSD.org
Date: Fri, 12 Apr 2002 19:46:31 +0900 (JST)
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Subject: [IPv6-jp 1041] Re: Path MTU discovery
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$B>>2<EE4o$N;0C+$G$9!#(B

$B?@L@$5$s!"$4@bL@$"$j$,$H$&$4$6$$$^$9!#(B

$B!t;d(B($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

> > $B$=$l$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

> $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

> $B$J$<!V(BIPv6$BE*(BMTU$B!W$,(Bndp$B%3%^%s%I$GI=<($5$l$k$+$H$$$&$H!"(BND(neighbor
> discovery)$B$N0lIt$G$"$k(BRA$B$N(BMTU$B%*%W%7%g%s$G<u$1$?CM$r0U<1$7$F$$$k$+$i$G(B
> $B$9!#$=$N0UL#$G$O(Bndp$B$H$$$&%3%^%s%I$G07$o$l$F$$$F$b$*$+$7$/$O$J$$$H;W$$(B
> $B$^$9!#(B

$B$J$k$[$I!"$^$@$^$@JY6/$,B-$i$J$$$h$&$G$9!#M}M3$,$o$+$l$P8+J}$bJQ$o$j(B
$B$^$9$M!#$I$&$b$"$j$,$H$&$4$6$$$^$7$?!#(B
--
                                   $B>>2<EE4o;:6H(B($B3t(B) AVC$B<R(B AVC$B3+H/%;%s%?!<(B
                                          $B;0C+(B $B9@(B   hmitani@vrl.mei.co.jp

