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<H2><A NAME="s5">5. $B2?$K(B NAT $B$r9T$&$+$r@)8f$9$k(B</A></H2>
<P>NAT $B$r9T$&$K$O!"$I$N%3%M%/%7%g%s$KJQ49$r$+$1!"$I$N$h$&$KJQ49$r9T$&$+$K$D$$$F(B
$B%+!<%M%k$K;X<($9$k(B NAT $B%k!<%k$r$D$/$kI,MW$,$"$j$^$9!#$3$N9T$&$?$a!"$H$F$b(B
$BM;DL$,Mx$/(B <CODE>iptables</CODE> $B%D!<%k$rMxMQ$7!"(B`-t nat' $B%*%W%7%g%s$r;XDj(B
$B$9$k$3$H$G!"(BNAT $B%F!<%V%k$rJQ99$9$k$h$&;X<($7$^$9!#(B
<P>
<P>NAT $B%k!<%k$N%F!<%V%k$O!"(B`chains' $B$H8F$P$l$k;0<oN`$N%j%9%H$+$i$J$j$^$9!#(B
$B$$$:$l$N%k!<%k$K$D$$$F$b!"$I$l$+$,E,9g$9$k$^$G=g$KD4$Y$i$l$^$9!#Fs<oN`$N(B
chain $B$K$O!"(BPREROUTING$B!J%Q%1%C%H$r<u?.$9$k$?$S$K!"08@h(B NAT $B$r9T$&$N$KMxMQ!K!"(B
$B$=$7$F(B POSTROUTING$B!J%Q%1%C%H$rAw?.$9$k$?$S$K!"Aw?.85(B NAT $B$r9T$&$N$KMxMQ!K(B
$B$,$"$j$^$9!#;0HVL\$N%j%9%H(B(OUTPUT)$B$O$3$3$G$OL5;k$5$l$^$9!#(B
<P>
<P>$BKM$K$$$/$i$+$G$b%"!<%F%#%9%F%#%C%/$J:MG=$,$"$C$?$i!"2<?^$O;0<oN`$N(B chain
$B$r@bL@$9$k$b$N$K$J$k$s$G$9$,$M!'(B
<P>
<BLOCKQUOTE><CODE>
<PRE>
_____ _____
/ \ / \
PREROUTING -->[Routing ]----------------->POSTROUTING----->
\D-NAT/ [Decision] \S-NAT/
| ^
| |
| |
| |
| |
| |
| |
--------> Local Process ------
</PRE>
</CODE></BLOCKQUOTE>
<P>$B>e?^$N$I$N%]%$%s%H$K$*$$$F$b!"%Q%1%C%H$,DL2a$9$k$H!"4XO"$9$k%3%M%/%7%g%s(B
$B$rD4$Y$k$3$H$K$J$j$^$9!#$b$7$=$l$,?7$7$$%3%M%/%7%g%s$J$i$P!"(B
$B$=$l$K$I$&$$$&=hM}$r9T$&$+CN$k$?$a$K!"(BNAT $B%F!<%V%k$NCf$N4XO"$9$k%A%'%$%s(B
$B$rD4$Y$k$3$H$K$J$j$^$9!#$=$3$+$iF@$i$l$kEz$($,!"Ev3:%3%M%/%7%g%s>e$N0J8e(B
$BA4$F$N%Q%1%C%H$KE,MQ$5$l$^$9!#(B
<P>
<H2><A NAME="ss5.1">5.1 iptables $B$rMxMQ$7$?C1=c$JA*Br(B</A>
</H2>
<P><CODE>iptables</CODE> $B$O!"0J2<$KNs5s$9$k$?$/$5$s$NI8=`E*$J%*%W%7%g%s$rMxMQ(B
$B$7$^$9!#(Biptables $B$,JL$NMxMQ2DG=$J%*%W%7%g%s$H6hJL2DG=$G$"$k$&$A$O!"(B
$BFs=E%@%C%7%e(B '--' $B$G;O$^$k%*%W%7%g%s$K$O$9$Y$FN,8l;XDj$,;H$($^$9!#(B
$B$b$7$"$J$?$N%^%7%s$N%+!<%M%k$,%b%8%e!<%k$H$7$F(B <CODE>iptables</CODE>
$B$r%5%]!<%H$7$F$$$k$J$i!"$^$:(B `insmod ip_tables' $B$G(B ip_tables.o
$B%b%8%e!<%k$r%m!<%I$9$kI,MW$,$"$j$^$9!#(B
<P>
<P>$B$3$3$G:G$b=EMW$J%*%W%7%g%s$O!"%F!<%V%kA*Br%*%W%7%g%s$G$"$k(B `-t' $B$G$9!#(B
$B$"$i$f$k(B NAT $B$NF0:n$K4X$7$F!"(BNAT $B%F!<%V%k$K(B `-t nat' $B$r;H$&$3$H$K$J$k(B
$B$G$7$g$&!#FsHVL\$K=EMW$J%*%W%7%g%s$O!"%A%'%$%s$N:G8e$K?7$?$J%k!<%k$rDI2C$9$k(B
`-A' $B%*%W%7%g%s!JNc!'(B`-A POSTROUTING'$B!K$+!"%A%'%$%s$N:G=i$K%k!<%k$rA^F~$9$k(B
`-I'$B%*%W%7%g%s!JNc!'(B`-I PREROUTING'$B!K$G$9!#(B
<P>
<P>NAT $B$r9T$$$?$$%Q%1%C%H$NAw?.85!J(B`-s' $B$+(B `--source'$B!K$d08@h!J(B`-d' $B$+(B
`--destination'$B!K$b;XDj2DG=$G$9!#$3$l$i$N%*%W%7%g%s$K$O!"C10l$N(B IP $B%"%I%l%9(B
$B!JNc!'(B192.168.1.1$B!K!"L>A0!JNc!'(Bwww.gnumonks.org$B!K!"$b$7$/$O%M%C%H%o!<%/(B
$B%"%I%l%9!JNc!'(B192.168.1.0/24 $B$d(B 192.168.1.0/255.255.255.0$B!K$,8e$KB3$-$^$9!#(B
<P>
<P>$BE,9g$9$k<u?.%$%s%?%U%'!<%9!J(B`-i' $B$+(B `--in-interface'$B!K$+Aw?.%$%s%?%U%'!<%9(B
$B!J(B`-o' $B$+(B `--out-interface'$B!K$r;XDj$9$k$3$H$b2DG=$G$9$,!";XDj2DG=$+$I$&$+$O!"(B
$B%k!<%k$r2C$($h$&$H$9$k%A%'%$%s$K0MB8$7$^$9!!!=(BPREROUTING $B$G$O<u?.%$%s%?(B
$B%U%'!<%9$N$_A*Br2DG=$G$9$7!"(BPOSTROUTING $B$G$OAw?.%$%s%?%U%'!<%9(B
$B$N$_A*Br2DG=$G$9!#$b$7$3$l$r4V0c$&$H!"(B<CODE>iptables</CODE> $B$O%(%i!<$r=P$7$^$9!#(B
<P>
<H2><A NAME="ss5.2">5.2 $B$I$N%Q%1%C%H$rNAM}$9$k$+A*Br$9$k8-$$%]%$%s%H(B</A>
</H2>
<P>$BAw?.85%"%I%l%9$d08@h%"%I%l%9$r;XDj2DG=$G$"$k$HA0$K=q$-$^$7$?!#Aw?.85%"%I%l%9(B
$B%*%W%7%g%s$r>JN,$7$?>l9g!"$"$i$f$kAw?.85%"%I%l%9$K$D$$$FE,MQ$5$l$^$9!#(B
$B08@h%"%I%l%9%*%W%7%g%s$r>JN,$7$?>l9g!"$"$i$f$k08@h%"%I%l%9$K$D$$$FE,MQ(B
$B$5$l$^$9!#(B
<P>
<P>TCP $B$d(B UDP $B$J$I$NFCDj$N%W%m%H%3%k$O!"(B`-p' $B$+(B `--protocol' $B$G;XDj2DG=$G!"(B
$B$=$N%W%m%H%3%k$N%Q%1%C%H$N$_$KBP$7$F%k!<%k$,E,MQ$5$l$^$9!#(B
$B$3$&$9$k<g$JM}M3$O!"(BTCP $B$d(B UDP $B$H$$$C$?%W%m%H%3%k$r;XDj$9$k$3$H$G!"(B
$B$=$N%W%m%H%3%k$KBP$7%*%W%7%g%s$rDI2C$G$-$k$3$H$K$"$j$^$9!!!]6qBNE*$K$O!"(B
`--source-port' $B$d(B `--destination-port' $B%*%W%7%g%s!J(B`--sport' $B$d(B
`--dport' $B$H>JN,2DG=!K$G$9!#(B
<P>
<P>$B$3$l$i$N%*%W%7%g%s$K$h$j!"FCDj$NAw?.85!"08@h%]!<%HHV9f$r;}$C$?%Q%1%C%H$N$_(B
$B$r%k!<%k$KE,9g$5$;$k$3$H$,2DG=$K$J$j$^$9!#$3$l$O%&%'%V%j%/%(%9%H!J(BTCP $B%]!<%H(B
$BHV9f(B80$BHV$d(B8080$BHV!K$r%j%@%$%l%/%H$7$F!"B>$N%Q%1%C%H$rL5;k$9$k$N$K;H$($^$9!#(B
<P>
<P>$B$3$l$i$N%*%W%7%g%s$O!"(B`-p' $B%*%W%7%g%s!J$=$N%W%m%H%3%k$K4X$9$k6&M-%i%$%V%i%j(B
$B3HD%$r%m!<%I$9$kI{:nMQ$,$"$k!K$N8e$KB3$+$J$/$F$O$J$j$^$;$s!#%]!<%HHV9f$+!"(B
/etc/services $B%U%!%$%k$K5-=R$5$l$?L>A0$r;HMQ2DG=$G$9!#(B
<P>
<P>$B%Q%1%C%H$KA*Br$G$-$k$"$i$f$k@-<A$,!"%^%K%e%"%k!J(B<CODE>man iptables</CODE>$B!K(B
$B$K$$$d$K$J$k$[$I>\:Y$K5-=R$5$l$F$$$^$9!#(B
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