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From: Mitani Hiroshi <hmitani@vrl.mei.co.jp>
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In-Reply-To: <y7vlmbuux19.wl@ocean.jinmei.org> from "JINMEITatuya/
 =?ISO-2022-JP?B?GyRAGyRCP0BMQEMjOkgbKEI=?=" at "Apr 11, 2002 11:31:30 pm"
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Subject: [IPv6-jp 1037] Re: Path MTU discovery
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$B>>2<EE4o$N;0C+$G$9!#(B

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

$B7kO@E*$K$O!"85$KLa$9$N$K(B reboot $B$7$J$1$l$P$J$i$J$$$H$$$&$3$H$O!"(B
interface MTU $B$r(B 1500-->800-->1500 $B$H@_Dj$9$k$h$&$JA`:n$O!"CWL?E*$J(B
$BIT2D5UA`:n$G$"$C$F!"8=>u$G$O$d$C$F$O$$$1$J$$$H$$$&$3$H$G$9$M!#(B

$B%F%9%H$N;EJ}$r>/$79M$(D>$7$F$_$^$9!#(B

--

$B>/$7OCBj$,JQ$o$C$F$7$^$&$N$G$9$,!"$b$7!";d$,(B FreeBSD $B$r(B IPv6 $B$N%k!<%?(B
$B$,$o$j$K;H$*$&$H$$$&$3$H$rA[Dj$9$k$H!":#2s$N8=>]$O>/$7;DG0$G$7$?!#(B

$B0J2<!"8DJL$NFbMF$K$D$$$F!";d$N4|BT$r>/$7=R$Y$?$$$H;W$$$^$9!#$b$7!"(B

$B!V(BIPv6$BE*$K$O!"$=$l$O$3$&$$$&M}M3$G%@%a$J$s$G$9!W(B
$B!V(BFreeBSD$B>e$K<BAu$9$k$3$H$,$G$-$^$;$s!#$=$l$O$3$&$$$&M}M3$G$9!W(B

$B$H$$$&FbMF$,$"$l$P!"(BIPv6 $B$d(B FreeBSD$B$rCN$k>e$GHs>o$K;29M$K$J$k$H;W$$$^$9(B
$B$N$G!"$h$m$7$1$l$P65$($F2<$5$$!#(B
 
> > a. MTU $B$r(B 800 $B$K@_Dj$7$?$H$-!"%k!<%?$N5sF0$O$I$&$"$k$Y$-$+(B?

$B;d$O(B Linux $B$O6l<j(B:-)$B$J$N$G!"NI$/CN$j$^$;$s$,!"(BLinux $B$G$O!"(Binterface 
MTU $B$r(B1280$B0J2<$K@_Dj$9$k$H!"(Bifconfig $B%3%^%s%I$GI=<($5$l$k(B inet6 $B%"%I(B
$B%l%9$,>C$($k$=$&$G$9(B($BEvA3(B Linux $B$N$3$H$G$9$+$i!">C$($?$+$i$H8@$C$F!"(B
$B$=$N%$%s%?!<%U%'!<%9$,(B IPv6 $BE*$J5!G=$r40A4$KDd;_$7$?$+$I$&$+$O$o$+$j(B
$B$^$;$s$,(B)$B!#3N$+$K!"$=$l$O$=$l$G0l$D$N9M$($H$7$FM}2r$G$-$^$9!#(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. 1500 $B$KLa$7$?8e!"(Bping6 $B$ODL$k$,!"(Budp $B$O>C<:$9$k$N$O$J$<$+(B?

interface MTU $B$H(B IPv6$BE*(B MTU $B$rFHN)$K4IM}$9$k$J$K$+$NI,A3@-$,$"$k$N$G(B
$B$7$g$&!#$7$+$7!"FCJL$J(Bpolicy $B$r@_Dj$7$F$$$k$o$1$G$b$J$$$N$K!"(BICMP $B$,(B
$BN.$l$k$N$K!"(BUDP/IP $B$,N.$l$J$$$H$$$&$N$O!"$"$^$j9gM}E*$H$O;W$($^$;$s!#(B

$BNc$($P!"(B

a. UDP/IP $B$,DL$i$J$$$J$i!"(BICMP $B$bDL$i$J$$!#(B

$B$3$l$J$i!"LdBj$,$I$3$GH/@8$7$F$$$k$N$+$9$0$KH=$j$^$9!#(B

b. ICMP $B$ODL$k$,!"(BUDP/IP $B$,DL$i$J$$>uBV$r5v$9!"$7$+$7!"(BUDP/IP$B$r<N$F$?(B
   $B%k!<%?$O(B ICMP $B$G%=!<%9B&%[%9%H$K<N$F$?$3$H$H$=$NM}M3$rDLCN$9$k!#(B

$B$3$l$G$b!"LdBj$,$I$3$GH/@8$7$F$$$k$N$+$9$0$KH=$j$^$9!#L[$C$F<N$F$i$l(B
$B$k$H:$$j$^$9!#(B


$B$"$H!"L>A0$KOG$o$5$l$F(B ndp $B$rA4A3CN$i$J$+$C$?$N$G$9$,!"(B

> $B$^$:!"(BBSD(KAME)$B$O(BIPv6$BE*$J(Blink MTU$B$r(Binterface$B$N(BMTU$B$H$OFHN)$K4IM}$7$F$$(B
> $B$F!"(BIPv6$BAX$N(BMTU$B4XO"$N=hM}(B($B%U%i%0%a%s%H$9$Y$-$+!"$J$I(B)$B$K$O(BIPv6$BE*$J(BMTU$B$r(B
> $B;2>H$7$F$$$^$9!#(B($B$b$A$m$s!"!VFHN)$K!W$H$O$$$C$F$b!"(Binterface MTU$B$+$i$/(B
> $B$k@)8B$K$OG{$i$l$^$9!#$?$H$($P!"(Binterface MTU$B$h$jBg$-$JCM$r(BIPv6$BE*(Blink
> MTU$B$H$7$F$O;}$F$^$;$s!#(B)$B!V(BIPv6$BE*(BMTU$B!W$O(B"ndp -i $B%$%s%?%U%'!<%9L>(B"$B$H$9$k(B
> $B$HI=<($5$l$^$9!#(B

$B%$%s%?!<%U%'%$%9L>$,I,MW$J$3$H$+$i$b!"(BIPv6$BE*(B MTU $B$G$"$C$F$b!"%$%s%?!<(B
$B%U%'%$%9(B($BBgDq$N>l9g!"FCDj$N%j%s%/(B)$B$KIU$/CM$G$"$k$J$i$P!"(B ifconfig $B$K(B
$B=8Ls$5$l$k$Y$-5!G=$G$O$J$$$G$7$g$&$+(B?

> MTU$B$rBg$-$/$9$k$H$-$K$O!"0U?^E*$K>.$5$/$7$F$$$?$N$+$b$7$l$J$$(BIPv6$BE*(BMTU
> $B$rC1=c$KA}$d$9$H$$$&$o$1$K$O$$$+$J$$$+$i$G$9!#(B

$B$3$l$OM}2r$G$-$^$9!#(B

> $B$H$j$"$($:$O!"(BIPv6$BE*(BMTU$B$r<jF0$G@_Dj$G$-$k$h$&$K$7$F!"(Binterface MTU$B$rA}(B
> $B$d$7$?8e!"I,MW$J$i(BIPv6$BE*(BMTU$B$b<jF0$GA}$d$9$h$&$K$9$k!"$/$i$$$G$7$g$&$+!#(B

ifconfig $B$K$3$NA`:n5!G=$,%^!<%8$5$l$k$H4r$7$$$G$9!#(B
--
                                   $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
