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<TITLE>Firewall And Proxy Server HOWTO: $B%U%!%$%"%&%)!<%k$rM}2r$9$k(B</TITLE>
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<H2><A NAME="s2">2. $B%U%!%$%"%&%)!<%k$rM}2r$9$k(B</A></H2>
<P>$BKI2PJI$H$O!"1d>F$rHr$1$k$3$H$r0U?^$7$?7zC[9=B$$G$9!#(B
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<P>$B%$%s%?!<%M%C%H$N%U%!%$%"%&%)!<%k$O!"$"$J$?$N%W%i%$%Y!<%H(B LAN $B$K(B
$B%$%s%?!<%M%C%H$NCO9v$N1j$r?/F~$5$;$J$$$3$H$r0U?^$7$F$$$^$9!#(B
$B0?$O!"$"$J$?$N(B LAN $BFb$N%a%s%P!<$,!"<Y0-$J%$%s%?!<%M%C%H>e$NM6OG$KBP$7$F9T$&(B
$B%"%/%;%9$r6X;_$7!"H`$i$r=c?h3n$D=c7i$KJ]$D$?$a$N$b$N$G$9!#(B ;-)
<P>
<P>$B=i4|$N%3%s%T%e!<%?%U%!%$%"%&%)!<%k$O!"Fs$D$N0[$J$k%M%C%H%o!<%/$K(B
$B@\B3$5$l$F$$$k!"7PO)@)8f$r9T$o$J$$(B Unix $B%[%9%H$G$7$?!#(B
$BJRJ}$N%M%C%H%o!<%/%+!<%I$O%$%s%?!<%M%C%H$K@\B3$5$l!"$b$&JRJ}$O(B
$B%W%i%$%Y!<%H(B LAN $B$K@\B3$5$l$F$$$^$7$?!#(B
$B%W%i%$%Y!<%H%M%C%H%o!<%/$+$i%$%s%?!<%M%C%H$XE~C#$9$k$K$O!"(B
$B%U%!%$%"%&%)!<%k(B (Unix) $B%5!<%P$K%m%0%*%s$7$J$1$l$P$J$j$^$;$s$G$7$?!#(B
$B<!$K%$%s%?!<%M%C%H$K%"%/%;%9$9$k0Y$K$=$N%5!<%P$N%j%=!<%9$r;H$$$^$9!#(B
$BNc$($P!"%U%!%$%"%&%)!<%k%7%9%F%`>e$N(B Netscape $B$N%V%i%&%6$rF0:n$5$;$F!"(B
$B$"$J$?$N%^%7%s>e$GF0:n$9$k(B X Window System $B$N%G%#%9%W%l%$>e$KI=<($G$-$^$9!#(B
$B%U%!%$%"%&%)!<%k>e$GF0:n$9$k%V%i%&%6$ON>J}$N%M%C%H%o!<%/$K%"%/%;%9(B
$B$G$-$^$9!#(B
<P>$B!ZLuCm(B: $B$3$N%(%T%=!<%I$K$D$$$F$O!"Nc$($P(B
<A HREF="http://www.delegate.org/">Delegate</A>
$B$N(B
<A HREF="http://www.delegate.org/ftp/pub/DeleGate/doc/History-199801-ja.txt">History of development</A>
$B$K$F$b$+$$$^8+$k$3$H$,$G$-$^$9!#![(B
<P>$B$3$NN`$N!V%G%e%"%k%[!<%`%7%9%F%`(B (dual homed system)$B!W(B
(2$B$D$N%M%C%H%o!<%/$K@\B3$5$l$F$$$k%7%9%F%`(B) $B$O!"$"$J$?$N%M%C%H%o!<%/>e$N(B
$B%f!<%6A4$F$,?.Mj$G$-$k$J$i!"$=$l$OAG@2$i$7$$$b$N$G$9!#(B
$BC1=c$K(B Linux $B%7%9%F%`$r%;%C%H%"%C%W$7$F!"%$%s%?!<%M%C%H$X%"%/%;%9$7$?$$(B
$B?MA4$F$K%"%+%&%s%H$rH/9T$9$l$PNI$$$N$G$9$+$i!#(B
$B$3$N@_Dj$K$h$C$F!"$"$J$?$N%W%i%$%Y!<%H%M%C%H%o!<%/>e$K$"$C$F!"(B
$B30$N@$3&$K$D$$$F$"$i$f$k$3$H$rCN$k%3%s%T%e!<%?$O!"%U%!%$%"%&%)!<%k$@$1$H(B
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$B%W%i%$%Y!<%H%M%C%H%o!<%/Fb$N?M$OC/$b<+J,<+?H$N%o!<%/%9%F!<%7%g%s$X(B
$B%$%s%?!<%M%C%H$+$iD>@\%@%&%s%m!<%I$9$k$3$H$O$G$-$^$;$s!#(B
$B:G=i$K%$%s%?!<%M%C%H$+$i%U%!%$%"%&%)!<%k$X%U%!%$%k$r%@%&%s%m!<%I$7$F$+$i!"(B
$B<!$K%U%!%$%"%&%)!<%k$+$i<+J,<+?H$N%o!<%/%9%F!<%7%g%s$X%@%&%s%m!<%I(B
$B$7$J$1$l$P$J$j$^$;$s!#(B
<P>$B:G=EMW(B - $BA4$F$N?/F~$N(B 99% $B$O!"967bBP>]$N%7%9%F%`$KBP$7$F%"%+%&%s%H%l%Y%k$N(B
$B%"%/%;%9$rF@$k$3$H$+$i;O$^$j$^$9!#(B
$B$G$9$N$G!"$3$N<o$N%U%!%$%"%&%)!<%k$O$*A&$a$7$^$;$s!#(B
$B$^$?!"$3$N%U%!%$%"%&%)!<%k$O@)8B$b$-$D2a$.$^$9!#(B
<P>
<H2><A NAME="ss2.1">2.1 $B%U%!%$%"%&%)!<%k$N%]%j%7!<(B</A>
</H2>
<P>
$B%U%!%$%"%&%)!<%k%^%7%s$3$=$"$J$?$,K>$`$b$N$NA4$F$G$"$k$H?.$8$k$Y$-$G$O$"$j$^$;$s!#(B
<EM>$B@h$:!"%]%j%7!<$r@_Dj$7$^$7$g$&(B</EM>$B!#(B
<P>$B%U%!%$%"%&%)!<%k$O(B 2$B$D$NMQES$K;H$o$l$^$9!#(B
<P>
<OL>
<LI> $B?M(B ($B%o!<%`(B / $B%/%i%C%+!<(B) $B$rDy$a=P$90Y!#(B</LI>
<LI> $B?M(B ($B=>6H0w(B / $B;R6!C#(B) $B$rJD$89~$a$k0Y!#(B</LI>
</OL>
<P>$B;d$,%U%!%$%"%&%)!<%k$K<h$jAH$s$G$$$?:"!";d$,F/$$$F$$$?2q<R$OH`$i$N(B
$B%M%C%H%o!<%/$+$i%/%i%C%+!<$rDy$a=P$9$3$H$h$j$b!"=>6H0w$r%9%Q%$(B
$B$9$k$3$H$K$h$j6=L#$r;}$C$F$$$?$3$H$K$H$F$b6C$-$^$7$?!#(B
<P>$B>/$J$/$H$b;d$N=#(B ($B%*%/%i%[%^(B) $B$G$O!"8[MQ<T$O=>6H0w$KCG$j$5$($9$l$P!"(B
$BH`$i$NEEOC$N2qOC$H%$%s%?!<%M%C%H$NMxMQ>u67$r4F;k$9$k8"Mx$r;}$C$F$$$^$7$?!#(B
<P>$BFH:[E*$@$C$?$N$O@/I\$G$O$J$/!"5pBg4k6H$@$C$?$N$G$9!#(B
<P>$B8m2r$7$J$$$G$/$@$5$$!#(B
$B?M!9$O6PL3;~4VCf$OF/$$$F$$$F!"M7$s$G$O$$$J$+$C$?H&$G$9!#(B
$B$=$7$F;d$O6PL3NQM}$,?*$^$l$k$3$H$r46$8$F$$$^$7$?!#(B
$B$7$+$7$J$,$i!";d$O$^$?(B"$B4IM}<TB&(B"$B$3$=H`$i$,@_Dj$7$?%k!<%k$N:G$b0-<A$J(B
$B8"MxMpMQ<T$G$"$k$3$H$r4F;k$7$F$$$^$7$?!#(B
$BDL6P%P%9$N7PO)$rC5$90Y$K%$%s%?!<%M%C%H$r;H$C$?$3$H$G;~4V5kO+F/<T$,(B
$B7P1D<T$KD(2|$5$l$?$HF1;~$K!"$^$5$K$=$ND(2|$r9T$C$?7P1D<T$,!"8+9~$_$N$"$k(B
$B8\5R$rO"$l$F$$$/$?$a$N>eEy$J%l%9%H%i%s$d%J%$%H%/%i%V$r!"(B
$B6PL3;~4VCf$K2?;~4V$b%M%C%H%5!<%U%#%s$7$F$$$?$N$r8+$F$-$^$7$?!#(B
<P>$B6PL3>e$N4IM}$N0Y$N%9%Q%$9T0Y$O!"(B Monster.com $B$G;E;vC5$7$r$7$F$$$k?M$r(B
$B8+$D$1$k$3$H$G$b$"$j$^$7$?!#(B
$B$G$b!";d$O7P1D<T$,O+F/<T$N>:3J>r7o$K(B "$B%(%$%:$K$+$+$C$F$$$k$+$bCN$l$J$$(B"
$B$+$I$&$+$r%A%'%C%/$9$k0Y$KH`(B/$BH`=w$,7r9/4IM}%5%$%H$KK,$l$?$3$H$,$"$k$+(B
$BH]$+$r8+$F$$$k;~$K!"$3$l$OHsNQM}E*$G$"$k$3$H$K5$IU$-$^$7$?!#(B
<P>
<P>$B%;%-%e%j%F%#$N;E;v$O62$m$7$$$3$H$K$J$j$+$M$^$;$s!#(B
$B$b$7$"$J$?$,%U%!%$%"%&%)!<%k$N4IM}<T$J$i!"$"$J$?$NGX8e$K$4Cm0U$"$l!#(B
<P>
<H3>$B%;%-%e%j%F%#%]%j%7!<$N:n@.J}K!(B</H3>
<P>$B;d$O:#$^$G%;%-%e%j%F%#%]%j%7!<$N:n@.J}K!$K4X$9$k!V%[%s%H$K6D!9$7$$!W(B
$BJ8=q$r4v$D$+8+$F$-$^$7$?!#(B
$B$=$s$J$N$r?.$8$F$O$$$1$^$;$s!#(B
$B%;%-%e%j%F%#%]%j%7!<$r:n$k$3$H$O$H$F$bC1=c$J$N$G$9!#(B
<P>
<P>
<OL>
<LI> $BM?$($k$b$N$r=q$-=P$9(B</LI>
<LI> $B$"$J$?$,%5!<%S%9$rDs6!$9$k?M$N%0%k!<%W$r=q$-=P$9(B</LI>
<LI> $B3F!9$N%0%k!<%W$,I,MW$H$9$k%"%/%;%9$O$I$N%5!<%S%9$J$N$+$r=q$-=P$9(B</LI>
<LI> $B3F!9$N%0%k!<%W$X$N%5!<%S%9Kh$K!"$I$N$h$&$K0BA4$r3NJ]$9$k$+$r=q$-=P$9(B</LI>
<LI> $BB>$N$+$?$A$r<h$k%"%/%;%9$O!"A4$F%;%-%e%j%F%#0cH?$G$"$k;]$N@k8@J8$r=q$/(B</LI>
</OL>
$B$"$J$?$N%]%j%7!<$O;~$H6&$K$h$jJ#;($K$J$k$G$7$g$&$1$l$I$b!"(B
$B2?$b$+$b$r%+%P!<$7$h$&$H$O$7$J$$$G$/$@$5$$!#(B
$BC1=c$GL@2r$K$9$k$3$H$r?4$,$1$F$/$@$5$$!#(B
<P>
<H2><A NAME="ss2.2">2.2 $B%U%!%$%"%&%)!<%k$N<oN`(B</A>
</H2>
<P>$B%U%!%$%"%&%)!<%k$K$O(B 2 $B<oN`$"$j$^$9!#(B
<P>
<OL>
<LI>$B%U%#%k%?%j%s%0%U%!%$%"%&%)!<%k(B - $BA*Br$7$?%M%C%H%o!<%/%Q%1%C%H$r(B
$B%V%m%C%/$7$^$9!#(B</LI>
<LI>$B%W%m%-%7%5!<%P(B ($B$7$P$7$P%U%!%$%"%&%)!<%k$H8F$P$l$^$9(B) - $B%M%C%H%o!<%/$X$N@\B3$rDs6!$7$^$9!#(B</LI>
</OL>
<P>
<H3>$B%Q%1%C%H%U%#%k%?%j%s%0%U%!%$%"%&%)!<%k(B</H3>
<P>$B%Q%1%C%H%U%#%k%?%j%s%0$O(B Linux $B%+!<%M%k$KAH$_9~$^$l$k%?%$%W$N(B
$B%U%!%$%"%&%)!<%k$G$9!#(B
<P>$B%U%#%k%?%j%s%0%U%!%$%"%&%)!<%k$O%M%C%H%o!<%/%l%Y%k$GF0:n$7$^$9!#(B
$B%U%!%$%"%&%)!<%k%k!<%k$,5v2D$7$?;~$@$1!"%G!<%?$O%7%9%F%`$+$i(B
$B=P$F$$$/$3$H$r5v$5$l$^$9!#(B
$BE~C#$7$?%Q%1%C%H$O!"3F!9$N%Q%1%C%H$K4^$^$l$F$$$k<oN`!"H/?.%"%I%l%9!"(B
$B08@h%"%I%l%9!"$=$7$F%]!<%H$N>pJs$K$h$C$F%U%#%k%?%j%s%0$5$l$^$9!#(B
<P>$BB?$/$N%M%C%H%o!<%/%k!<%?$O$"$kDxEY$N%U%!%$%"%&%)!<%k%5!<%S%9$r(B
$B<B8=$9$k5!G=$r;}$C$F$$$^$9!#(B
$B%U%#%k%?%j%s%0%U%!%$%"%&%)!<%k$O$=$l$i$NN`$N%k!<%?$HF1Ey$H9M$($i$l$^$9!#(B
$B$3$N$?$a!"$3$l$rF0:n$5$;$k$K$"$?$C$F(B IP $B%Q%1%C%H$N9=B$$KBP$9$k(B
$B?<$$M}2r$rI,MW$H$7$^$9!#(B
<P>$B2r@O!&5-O?$5$l$k%G!<%?$OHs>o$K>.$5$$$N$G!"%U%#%k%?%j%s%0%U%!%$%"%&%)!<%k$O(B
CPU $BIi2Y$rKX$II,MW$H$7$^$;$s$7!"%M%C%H%o!<%/$NCY1d$bKX$I@8$8$^$;$s!#(B
<P>$B%U%#%k%?%j%s%0%U%!%$%"%&%)!<%k$O%Q%9%o!<%I@)8f$r9T$$$^$;$s!#(B
$B%f!<%6$O<+J,$rG'>Z$5$;$k$3$H$O$G$-$^$;$s!#(B
$B%f!<%6$r<1JL$9$kM#0l$NJ}K!$O!"%o!<%/%9%F!<%7%g%s$K3d$jEv$F$i$l$?(B
IP $B%"%I%l%9$G$9!#(B
$B$3$N$3$H$O(B DHCP (Dynamic IP assignments: $BF0E*(B IP $B3d$jEv$F(B) $B$N;HMQ$r(B
$B0U?^$7$F$$$k>l9g$KLdBj$r$R$-5/$3$92DG=@-$,$"$j$^$9!#(B
$B%k!<%k$O(B IP $B%"%I%l%9$r<j$,$+$j$K$7$F$$$k$N$G!"?7$?$J(B IP $B%"%I%l%9$,(B
$B3d$jEv$F$i$l$kEYKh$K%k!<%k$rD4@0$7$J$1$l$P$J$i$J$/$J$j$^$9!#(B
$B;d$O$3$l$r<+F02=$9$k=Q$rCN$j$^$;$s!#(B
<P>$B%U%#%k%?%j%s%0%U%!%$%"%&%)!<%k$O%f!<%6$K$H$C$F$h$jF)2aE*$G$9!#(B
$B%f!<%6$O%$%s%?!<%M%C%H$X%"%/%;%9$9$k0Y$K;HMQ$9$k%"%W%j%1!<%7%g%s$K(B
$B%k!<%k$r@_Dj$9$kI,MW$,$"$j$^$;$s!#(B
$BKX$I$N%W%m%-%7%5!<%P$G$O@_Dj$NI,MW$,$"$j$^$9!#(B
<P>
<H3>$B%W%m%-%7%5!<%P(B</H3>
<P>
$B%W%m%-%7$OKX$I$N>l9g!"30It$X$N%H%i%U%#%C%/$r@)8f$^$?$O4F;k$9$k0Y$K(B
$B;H$o$l$^$9!#(B
$BMW5a$5$l$?%G!<%?$r%-%c%C%7%e$9$k%"%W%j%1!<%7%g%s%W%m%-%7$bB8:_$7$^$9!#(B
$B$3$N$3$H$K$h$C$FI,MW$H$5$l$k%M%C%H%o!<%/$N%P%s%II}$rDc2<$5$;!"(B
$B<!$N%f!<%6$KBP$7$FF1$8%G!<%?$X$N%"%/%;%9$rDc2<$5$;$^$9!#(B
$B$=$l$H6&$K2?$,E>Aw$5$l$?$N$+$rF0$+$L>Z5r$H$7$FDs6!$7$^$9!#(B
<P>$B%W%m%-%7%5!<%P$K$O(B 2$B<oN`$"$j$^$9!#(B
<OL>
<LI>$B%"%W%j%1!<%7%g%s%W%m%-%7(B - $B$"$J$?$N0Y$K;E;v$r$7$F$/$l$^$9!#(B</LI>
<LI>SOCKS $B%W%m%-%7(B - $B%/%m%9%o%$%d%]!<%H$G$9!#(B</LI>
</OL>
<P>
<H3>$B%"%W%j%1!<%7%g%s%W%m%-%7(B</H3>
<P>$B:G$bNI$$Nc$O!"$"$k?M$,B>$N%3%s%T%e!<%?$X(B telnet $B@\B3$7$F$+$i!"$=$N(B
$B%3%s%T%e!<%?$+$i303&$X(B telnet $B@\B3$9$k$3$H$G$9!#(B
$B%"%W%j%1!<%7%g%s%W%m%-%7%5!<%P$O!"$3$N<j=g$r<+F02=$7$^$9!#(B
$B$"$J$?$,303&$X(B telnet $B@\B3$9$k$H!"@h$:%/%i%$%"%s%H$O$"$J$?$r%W%m%-%7$X(B
$BAw$j=P$7$^$9!#(B
$B%W%m%-%7$O<!$K$"$J$?$,MW5a$9$k(B ($B303&$N(B) $B%5!<%P$X@\B3$7!"%G!<%?$r$"$J$?$X(B
$BJV$7$^$9!#(B
<P>$B%W%m%-%7%5!<%P$OA4$F$N@\B3$r=hM}$9$k$N$G!"(B($B$"$J$?$r4^$a$F(B)$B%"%/%;%9$9$k(B
$BA4$F$N5sF0$r%m%05-O?$9$k$3$H$,$G$-$^$9!#(B
HTTP (web) $B%W%m%-%7$K$*$$$F$O!"$"$J$?$,1\Mw$9$k%5%$%H$N(B URL $B$=$N$b$N$,(B
$B4^$^$l$^$9!#(B
FTP $B%W%m%-%7$K$*$$$F$O!"$"$J$?$,%@%&%s%m!<%I$7$?A4$F$N%U%!%$%k$,4^$^$l$^$9!#(B
$B$"$J$?$,K,$l$k%5%$%H$+$i(B "$BITE,Ev$J(B" $B8@MU$5$($bGS=|$7$?$j!"(B
$B%&%#%k%9%9%-%c%s$b$G$-$^$9!#(B
<P>$B%"%W%j%1!<%7%g%s%W%m%-%7%5!<%P$O%f!<%6G'>Z$,$G$-$^$9!#(B
$B30$+$i$N@\B3$,9T$o$l$kA0$K!"%5!<%P$O%f!<%6$KBP$7$F:G=i$K%m%0%$%s$r:EB%$7$^$9!#(B
web $B%f!<%6$K$*$$$F$O!"A4$F$N%5%$%H$K$*$$$F%m%0%$%s$rMW5a$5$l$k$h$&$K8+$($^$9!#(B
<P>
<H3>SOCKS $B%W%m%-%7(B</H3>
<P>
SOCKS $B%5!<%P$O5l7?$N%9%$%C%A%\!<%I$KBgJQNI$/;w$F$$$^$9!#(B
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