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From: Hajimu UMEMOTO (=?ISO-2022-JP?B?GyRCR19LXBsoQiA=?=
	=?ISO-2022-JP?B?GyRCSCUbKEI=?=) <ume@mahoroba.org>
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Subject: [IPv6-jp 208] Re: tunnel over NAT
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  $BG_K\!w(BIMASY$B$G$9!#(B

>>>>> On Fri, 30 Apr 1999 00:24:45 +0900
>>>>> itojun@iijlab.net said:

> NAT$B1[$($OL5M}$G$9!#(BIPv6 over IPv4 tunnel$B$G$O!"%H%s%M%k$r(B
> $BG'<1$9$k$N$K(BIPv4 source + IPv4 dest$B$N%Z%"$G$7$+H=CG$G$-$J$$$s$G!"(B
> $B=q49$($i$l$k$H=*$j$^$9!#(B

itojun> $B$HL537$KCG$k$N$b%J%K$J$N$G!#$3$l$GF0$/$s$@$m$&$+(B?

  $B$J$s$H$J$/$G$-$J$$5$$,!#!#!#(B

itojun> $BBLL\$b$H$G$d$C$F$_$F$/$@$5$$!#(B

  $B0JA0!"8GDj(B IPv4 $B%"%I%l%9$r(B 2 $B8D3d$jEv$F$F;n$7$?$3$H$,$"$k$N$G$9$,!"(B
$B$&$^$/9T$+$J$+$C$?$=$&$G$9!#$=$N$H$-$O!"$d$C$Q$jL5M}$J$s$@$m$&$H$$$&$3(B
$B$H$G!"?<DI$$$;$:$"$-$i$a$^$7$?!#$b$C$H$b!"@_Dj$,@5$7$/$G$-$F$$$J$+$C$?(B
$B2DG=@-$b$"$k$N$G!"F0$-$=$&$J$b$N$J$i!"$b$&0lEY%H%i%$$9$k$G$9!#(B

itojun> #	$B8GDj$N(BIPv4$B%"%I%l%9$,Lc$($k$/$i$$$J$i(BNAT$B$7$J$$$+(B?

  $B$$$d!"(BIPv4 $B%"%I%l%9$r(B 1 $B8D$@$1$b$i$C$F$b4r$7$/$J$$?M$,(B NAT $B$9$k$G$9!#(B
$B8GDj$+$I$&$+$O4X78$J$$$G$9!#(BNAT $B;H$&$H!"5?;wE*$K%M%C%H%o!<%/7?%@%$%"%k(B
$B%"%C%W@\B3$G$-$^$9$N$G!#(B
  $B$G!"(Brouter $B;H$C$F(B NAT $B$J?M$,(B IPv6 $B$7$h$&$H$9$k$H!"$=$N%M%C%H%o!<%/J,(B
$B$N(B IPv4 $B%"%I%l%9$,I,MW$K$J$C$F$7$^$$$^$9!#(B

itojun> client$B$N(BNAT$BH"$G$O!"0J2<$N$h$&$K(Bprotocol$BHV9f;H$C$F(Bstatic$B$K(BNAT mapping$B$r(B
itojun> $B@_Dj$9$k(B($BIaDL$KGd$C$F$k(BNAT$B%k!<%?$G$3$l$O$G$-$k$@$m$&$+(B?)

  $B0JA0%H%i%$$7$?$H$-$O!"(BNAT $BH"MQ$H(B KAME $BH"$X$N%^%C%T%s%0MQ$N(B 2 $B$D$N8G(B
$BDj(B IPv4 $B%"%I%l%9$r;HMQ$7$^$7$?!#(Bprotocol $BHV9f$G$O;n$7$F$O$$$^$;$s!#(B

	upstream (imasy$BB&$N(BKAME$BH"(B)
	  |A
	  :	global IPv4 address
	  |B C
	NAT box
	  |c
	==+==
	  |d

  client (imasy$B$N%f!<%6B&$N(BKAME$BH"(B)

  upstream$B$G$O!"(Bgifconfig gif0 A C

  client$B$N(BKAME$BH"$G$O!"(B

	gifconfig gif0 d A
	gifconfig gif0 C A

$B$$$:$l$b$d$C$F$_$?$=$&$G$9!#(B

--
$BG_K\(B $BH%(B $B!w(B $B%$%s%?!<%M%C%H8_=u2q2#IM(B
ume@mahoroba.org  ume@bisd.hitachi.co.jp  http://www.imasy.org/~ume/
$B%W%m%0%i%`$O=q$$$??M$N0U?^$G$O$J$/=q$+$l$?DL$jF0$/(B
