doc-linux-ja-html 2006.05.25-1.1 / usr / share / doc / HOWTO / ja-html / Firewall-HOWTO-3.html

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
<HTML>
<HEAD>
 <META NAME="GENERATOR" CONTENT="SGML-Tools 1.0.9">
 <TITLE>Firewall And Proxy Server HOWTO: $B%U%!%$%"%&%)!<%k$N%"!<%-%F%/%A%c(B($B4pK\@_7W(B)</TITLE>
 <LINK HREF="Firewall-HOWTO-4.html" REL=next>
 <LINK HREF="Firewall-HOWTO-2.html" REL=previous>
 <LINK HREF="Firewall-HOWTO.html#toc3" REL=contents>
</HEAD>
<BODY>
<A HREF="Firewall-HOWTO-4.html">$B<!$N%Z!<%8(B</A>
<A HREF="Firewall-HOWTO-2.html">$BA0$N%Z!<%8(B</A>
<A HREF="Firewall-HOWTO.html#toc3">$BL\<!$X(B</A>
<HR>
<H2><A NAME="s3">3. $B%U%!%$%"%&%)!<%k$N%"!<%-%F%/%A%c(B($B4pK\@_7W(B)</A></H2>

<P>$B%U%!%$%"%&%)!<%k$rMQ$$$F%7%9%F%`$rKI8f$9$k$h$&$J%M%C%H%o!<%/9=@.$K$O!"(B
$BMM!9$J<oN`$,$"$j$^$9!#(B
<P>$B%k!<%?$rDL$8$F%$%s%?!<%M%C%H$X@lMQ@~@\B3$7$F$$$k$J$i!"(B
$B%k!<%?$rD>@\%U%!%$%"%&%)!<%k%7%9%F%`$K@\B3$7$F$b$$$$$G$7$g$&!#(B
$B$"$k$$$O%O%V$r$+$^$;$F%U%!%$%"%&%)!<%k$N30B&$K%5!<%P72$rCV$-!"(B
$B$=$l$i$K%U%k%"%/%;%9$rDs6!$9$k$+$?$A$G$b$$$$$G$7$g$&!#(B
<P>
<H2><A NAME="ss3.1">3.1 $B%@%$%d%k%"%C%W%"!<%-%F%/%A%c(B</A>
</H2>

<P>$B$-$C$HFI<T$O(B ISDN $B2s@~$N$h$&$J%@%$%d%k%"%C%W%5!<%S%9$rMxMQ$7$F$$$k(B
$B$3$H$G$7$g$&!#(B
$B$3$N>l9g!"Bh;0$N%M%C%H%o!<%/%+!<%I$rMQ$$$F%U%#%k%?%j%s%0$5$l$?(B DMZ
$B!ZLuCm(B: Demilitarized Zone: $BHsIpAu2=COBS![$r:n$j=P$9$N$b$$$$$+$b$7$l$^$;$s!#(B
$B$3$&$9$l$P%$%s%?!<%M%C%H%5!<%S%9$r40A4$K%3%s%H%m!<%k$G$-$^$9$7!"(B
$B$+$D$=$l$i$rDL>o$N%M%C%H%o!<%/$+$i$O@Z$jN%$7$F$*$1$^$9!#(B
<P>
<PRE>
                  __________
   _/\__/\_      | $B%U%!%$%"(B |           __________________
  |$B%$%s%?!<(B|     | $B%&%)!<%k(B |  (LAN)   |                  |
 /  $B%M%C%H(B  \----| $B%7%9%F%`(B |--($B%O%V(B)--|$B%o!<%/%9%F!<%7%g%s(B|
 \_  _  _  _/    |__________|          |__________________|
   \/ \/ \/           |
                    (DMZ)
                    ($B%O%V(B)
</PRE>
<P>
<H2><A NAME="ss3.2">3.2 $BC10l$N%k!<%?$N%"!<%-%F%/%A%c(B</A>
</H2>

<P>$B$"$J$?$N%^%7%s$H%$%s%?!<%M%C%H$N4V$K%k!<%?$d%1!<%V%k%b%G%`$,$"$k>l9g$r(B
$B9M$($^$7$g$&!#(B
$B$=$N%k!<%?$,$"$J$?$N=jM-J*$J$i!"$=$N%k!<%?$K6/8G$J%U%#%k%?%k!<%k$r(B
$B@_Dj$G$-$k$G$7$g$&!#(B
$B%k!<%?$,(B ISP $B$N=jM-$J$i!"I,MW$J%3%s%H%m!<%k$r9T$&$3$H$OB?J,$G$-$J$$$G$7$g$&!#(B
ISP $B$K%U%#%k%?$r@_Dj$9$k$h$&$KMj$`$3$H$O$G$-$k$+$b$7$l$^$;$s!#(B
<P>
<PRE>
                  _________            __________
   _/\__/\_      | $B%k!<%?(B  |          | $B%U%!%$%"(B |           _______________
  |$B%$%s%?!<(B|     |  $BKt$O(B   |  (DMZ)   | $B%&%)!<%k(B |  (LAN)   |    $B%o!<%/(B     |
 /  $B%M%C%H(B  \----|$B%1!<%V%k(B |--($B%O%V(B)--| $B%7%9%F%`(B |--($B%O%V(B)--|  $B%9%F!<%7%g%s(B |
 \_  _  _  _/    | $B%b%G%`(B  |    |     |__________|          |_______________|
   \/ \/ \/      |_________|    |  
                              ($B30It(B)    
                             ($B%5!<%P(B)
</PRE>
<P>
<H2><A NAME="ss3.3">3.3 $B%W%m%-%7%5!<%P$rH<$&%U%!%$%"%&%)!<%k(B</A>
</H2>

<P>$B%M%C%H%o!<%/>e$N%f!<%6$N%"%/%;%9$r%b%K%?$9$kI,MW$,$"$j!"%M%C%H%o!<%/$N(B
$B5,LO$,>.$5$$$J$i$P!"%U%!%$%"%&%)!<%k$K%W%m%-%7%5!<%P$rE}9g$G$-$^$9!#(B
ISP $B$K$h$C$F$O!"$3$l$r9T$C$F%f!<%6$N%j%9%H$r:n$j!"%^!<%1%F%#%s%0$r(B
$B9T$C$F$$$kBeM}E9$KGd$C$F$$$k$h$&$J$3$H$b$"$j$^$9!#(B
<PRE>
                   __________
    _/\__/\_      |$B%W%m%-%7(B/ |           ______________
   |$B%$%s%?!<(B|     | $B%U%!%$%"(B |  (LAN)   |   $B%o!<%/(B     |
  /  $B%M%C%H(B  \----| $B%&%)!<%k(B |--($B%O%V(B)--| $B%9%F!<%7%g%s(B |
  \_  _  _  _/    | $B%7%9%F%`(B |          |______________|
    \/ \/ \/      |__________|
</PRE>
<P>$B%W%m%-%7%5!<%P$O!"(BLAN $B$K$b9%$-$J$h$&$K@_CV$G$-$^$9!#(B
$B$3$N>l9g!"$=$N%W%m%-%7%5!<%P$,Ds6!$7$F$$$k%5!<%S%9$K$D$$$F$O!"(B
$B%W%m%-%7%5!<%P$@$1$,%$%s%?!<%M%C%H$K@\B3$G$-$k$h$&$K$9$k$Y$-$G$9!#(B
$B$3$&$9$l$P%f!<%6$O%W%m%-%7%5!<%P$rDL$7$F$7$+%$%s%?!<%M%C%H$K(B
$B@\B3$G$-$J$/$J$j$^$9!#(B
<P>
<PRE>
                  __________
   _/\__/\_      | $B%U%!%$%"(B |           _______________
  |$B%$%s%?!<(B|     | $B%&%)!<%k(B |  (LAN)   |    $B%o!<%/(B     |
 /  $B%M%C%H(B  \----| $B%7%9%F%`(B |--($B%O%V(B)--|  $B%9%F!<%7%g%s(B |
 \_  _  _  _/    |__________|    |     |_______________|
   \/ \/ \/                      |     ______________
                                 |    |              |
                                 +----|$B%W%m%-%7%5!<%P(B|
                                      |______________|
</PRE>
<P>
<H2><A NAME="ss3.4">3.4 $B>iD9$J%$%s%?!<%M%C%H$N@_Dj(B</A>
</H2>

<P>YAHOO $B$d(B SlashDot $B$N$h$&$J%5!<%S%9$r2TF/$5$;$k$D$b$j$J$i!">iD9$J%k!<%?$H(B
$B%U%!%$%"%&%)!<%k$rMQ$$$F%7%9%F%`$r9=C[$7$?$/$J$k$3$H$G$7$g$&!#(B
(High Availability HowTo $B$r$4Mw$K$J$C$F$/$@$5$$!#(B)
$B!ZLuCm(B: Linux High Availability HOWTO $B$O(B
<A HREF="http://www.ibiblio.org/pub/Linux/ALPHA/linux-ha/High-Availability-HOWTO.html">http://www.ibiblio.org/pub/Linux/ALPHA/linux-ha/High-Availability-HOWTO.html</A>
$B$K$"$j$^$9!#(B
High Availability $B$O!V9b2DMQ@-!W$r0UL#$7$^$9!#![(B
<P>1$B$D$N(B URL $B$HJ#?t$N(B ISP $B$+$iJ#?t$N(B web $B%5!<%P$X$N%"%/%;%9$rDs6!$9$k!"(B
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$BJ#?t$N(B web $B$K;+$/$3$H$,$G$-$^$9!#(B
$B$=$7$F(B High availability $B5;=Q$r;H$C$F$$$k(B ISP$B!&%k!<%?!&%U%!%$%"%&%)!<%k$r(B
$BJ#?tMQ$$$k$3$H$K$h$C$F!"(B 100% $B%U%k2TF/$N%5!<%S%9$r<B8=$G$-$^$9!#(B
<P>$B!ZLuCm(B: round-robin $B$H$O!"1_7A$K=pL>$7$?@A4j=q$r0UL#$7$^$9!#(B
$B$3$3$G$O(B DNS $B$K$"$k0l$D$N(B URL $B$KBP$7$FJ#?t$N%5!<%P$NBP1~4X78$rNs5s$7!"(B
$BB??t$N%/%i%$%"%s%H$NMW5a$KBP$7$F$=$N%j%9%H$r=gHV$K;HMQ$9$k$3$H$K$h$j!"(B
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<P>
<PRE>
   _/\__/\_                                       _/\__/\_  
  |        |                                     |        | 
 /  ISP #1  \______                  (WAN)______/$B%Q!<%H%J!<(B\
 \_  _  _  _/      |                 ($B%O%V(B)     \_  _  _  _/
   \/ \/ \/        |                ___|____      \/ \/ \/  
                 __|___            |_______ |
   _/\__/\_     |_____ |          |$B%U%!%$%"(B||           ______
  |        |   |      ||  (DMZ)   |$B%&%)!<%k(B||  (LAN)   |      |
 /  ISP #2  \--|$B%k!<%?(B||--($B%O%V(B)--|$B%7%9%F%`(B||--($B%O%V(B)--| WS/s |
 \_  _  _  _/  |______|     |     | (VPN)  |     |     |______|
   \/ \/ \/                 |     |________|     |      ________
          |              ($B30It(B)        |         |     |        |
  ------  |             ($B%5!<%P(B)     ($B6&M-(B)      +-----|$B%W%m%-%7(B|
 | WS/s | |                         ($B%5!<%P(B)           |________|
 | VPN  |-+
 |______|
</PRE>
<P>$B%M%C%H%o!<%/$O$9$0$K$"$J$?$N<j$KIi$($J$/$J$k$b$N$G$9!#(B
$BA4$F$N@\B3$rGD0.$7B3$1$F$/$@$5$$!#(B
$B%f!<%6$,%b%G%`$r;}$C$F$$$F!"$=$N%b%G%`$+$i(B LAN $B$K?/F~$5$l$?$i!"(B
LAN $B$O4m5!$K4Y$j$^$9!#(B
<P>
<P>
<HR>
<A HREF="Firewall-HOWTO-4.html">$B<!$N%Z!<%8(B</A>
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