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Date: Fri, 18 Jan 2002 20:20:20 +0900
From: Tomokazu Terakado <tomokazu@colx.co.jp>
To: FreeBSD-users-jp@jp.FreeBSD.org
In-Reply-To: <20020117164816.E079.CHORES@him.ne.jp>
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Subject: [FreeBSD-users-jp 66509] Re: natd 
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$B$3$s$K$A$O!#$F$i$+$I$G$9!#(B

$BA4It$N%Q%1%C%H$r$I$3$+0c$&>l=j$XE>Aw$7$F!"(B
$B$=$l$r$-$A$s$H85$NAw$j<g$KJV$9(B.. $B$H$+$$$&<B83$@$1$G(B
$B$h$$$N$J$i!"$b!<$9$3$7;n834D6-$rC1=c$K$7$?$[$&$,$$$$$h$&$J(B
$B5$$b$9$k$N$G$9$,!";v>p$b$"$k$N$G$7$g$&$M(B :-)


$B$^$:!"K\Bj$H$O4X78$J$5$2$G$9$,!"(B
nic $B$K(B alias $B$GHV9f$r?6$k$H$-$O!"(Bmask $B$O(B 255.255.255.255
$B$,4pK\$G$9$N$G!"D>$7$?$[$&$,$h$$$G$7$g$&!#(B


$BDMED$5$s@_Dj$N2?$,$*$+$7$$$N$+!"LLGr$=$&$J$N$GDI$$$+$1$F$_$h$&$H(B
$B;W$C$?$N$G$9$,!"!"F,$NCf$GA[A|$9$kF0:n$H<B:]$N%m%0$,0[$J$k$N$G(B
$B:C@^$7$^$7$?!#(B($B$?$V$s$\$/$N2r<a$N$I$3$+$,$*$+$7$$(B..$B!#(B)

$B$G!"DMED$5$s$N@_Dj$N$*$+$7$$$H$3$m$O!"2?$,2?$G$b(B -redirect_address
$B$N@_Dj$G=q$-49$($r9T$*$&$H$7$F$$$k$H$3$m$@$H;W$$$^$9!#(B

$BA0$K$b=q$-$^$7$?$,!"$3$N:n@o$@$H!"(Bdest $B$r=q$-49$($k$R$H$H(B
src $B$r=q$-49$($k?M$,$=$l$>$lFHN)$7$F$$$^$9!#(B
dest $B$r=q$-49$($k$K$O(B redirect_address $B$G$9$,!"(Bsrc $B$r=q$-49$($k$N$O(B
natd $B$NI8=`F0:n$G$9$+$i!"$3$A$i$N(B natd $B$K$O(B redirect_adress
$B$O$$$j$^$;$s!#(B


$B%9%F%C%W$O#4$D(B?

  192.x.x.10:1078 -> 192.x.x.1:80
$B$N(B dest $B$r=q$-49$($k(B natd(a) $B$H%k!<%k(B(1)$B!#(B
  192.x.x.10:1078 -> 210.y.y.2:80
$B$3$N%Q%1%C%H$,=P$F9T$/$H$-$K(B src $B$r=q$-49$($k(B natd(b) $B$H%k!<%k(B(2)$B!#(B
  192.x.x.1:????  -> 210.y.y.2:80

$BLa$C$F$-$?$b$N(B
  210.y.y.2:80 -> 192.x.x.1:????
$B$N(B dest $B$r85$KLa$9(B natd(b) $B$H%k!<%k(B(3)$B!#(B
$B$d$d$3$7$$$+$b$7$l$J$$$1$I!"(Bnatd(b) $B$O$5$C$-(B src $B$r=q$-49$($??M$@$+$i!"(B
$BK\Ev$N<u<h?M$,J,$+$j$^$9$h$M!#$G!"$3$&$J$j$^$9!#(B
  210.y.y.2:80 -> 192.x.x.10:1078
$B<!$K$3$l$,=P$F9T$/$H$-$K(B src $B$r85$KLa$9(B natd(a) $B$H%k!<%k(B(4)$B!#(B
$BF1$8$/(B natd(a) $B$O=q$-La$9$?$a$N>pJs$r$b$C$F$^$9$N$G!"3Z>!!#(B
  192.x.x.1:80 -> 192.x.x.10.1078

$B$H$$$&$o$1$G!"$a$G$?$/85$N$R$H$K%Q%1%C%H$,JV$k;EAH$_!#(B

$B$3$N%k!<%k$H(B natd $B$N@_Dj$r$=$N$^$s$^=q$-9~$a$P!"(B
$B@dBP$KF0$-$^$9!#(B


$B$H$$$&$o$1$G!"(B

> $B$3$N>uBV$G!"%^%7%s(BA$B$+$i(B lynx 192.y.y.1 $B$H$9$k$H!"%^%7%s(BC$B$G$N(B tcpdump $B$,(B
> $B0J2<$NDL$j$H$J$j!"%^%7%s(BA$B$N(Blynx$B$O(B Making HTTP connection $B$N$^$^$K$J$C$F(B
> $B$7$^$$$^$9!#(B

$B$H$$$&$N$O!":G=i$N(B ack $B$9$i@5$7$/La$i$J$$$s$@$+$i!"(B
$B$=$&$J$k$N$OEvA3$NF0:n$G$9!#(B

> $BB?J,(B R(RST) $B$,5"$C$F$-$F$$$k$N$,LdBj$J$N$@$H$O;W$&$N$G$9$,!"2?$,860x$G$I(B
> $B$N$h$&$K2sHr$7$?$i$h$$$N$+J,$+$i$:$K$*$j$^$9!#(B

$BF1$8$/$3$l$b!"$=$l$K5/0x$7$F(B lynx $B$,%.%V%"%C%W$7$?%Q%1%C%H$G$7$g$&!#(B



> $B@5$7$$@_Dj$NJ}K!!"%A%'%C%/$9$Y$-E@!";29M$K$J$k(BWEB$B%Z!<%8!">pJsITB-$NE@$J(B
> $B$I$I$s$J;v$G$b7k9=$G$9$N$G65$($F$/$@$5$$!#(B

$B$\$/$,;n$7$?$3$NJ}K!$b$I$3$+$K=q$$$F$"$C$?$o$1$8$c$J$/$F!"(B
$B$J$s$H$J$/$"$l$3$l9M$($F<B8=$7$^$7$?!#(B

$B$"$^$j$K$b>R2p$5$l$F$$$J$$$N$G!"$3$s$J$3$H$O$7$F$O$$$1$J$$$3$H(B
$B$J$N$@$m$&$+$H$b;W$$$^$7$?$,(B...$B$I$&$J$s$G$7$g$&$M!#(B

$B$\$/$OFH3X$G!"$+$D<~$j$K$O(B UNIX $B$JCg4V$,A4A3$$$^$;$s$N$G!"(B
$B$+$J$j$R$M$/$l$?J}K!$J$N$+$b$7$l$^$;$s!#(B
$B$?$@!"F0$/$N$OJ]>Z$7$^$9(B($B>P(B)$B!#(B


$B$I$&$>$,$s$P$C$F$/$@$5$$!#(B

---
Tomokazu Terakado <tomokazu@colx.co.jp>
$B9bED$5$s!"$$$k$N(B?

