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From: Tatsuo Kusano <kusano@yubitoma.co.jp>
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Subject: [FreeBSD-tech-jp 3436] ARP =?ISO-2022-JP?B?GyRCJUYhPBsoQg==?=
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$BApLn$H?=$7$^$9!#(B

$B8=:_(B FreeBSD 4.10 $B$G(BWeb$B%5!<%P$rAH$_!"Ii2YJ,;6AuCV$r7PM3$7$F%$%s%?!<%M%C(B
$B%H$K8x3+$7$F$$$^$9!#(B

FreeBSD 5.2.1 $B$K%P!<%8%g%s%"%C%W$7$F!"%F%9%H$7$?$H$3$m!"$3$N9=@.$G$O!"(B
$BIi2YJ,;6AuCV$,5!G=$7$J$/$J$C$F$7$^$&$3$H$,J,$+$j$^$7$?!#(B

$BMW5a$r<u$1<h$C$?(BMAC$B%"%I%l%9$H$O0c$&$H$3$m$KJV$9ItJ,$,LdBj$@$H;W$o$l$^$9!#(B
$B%=!<%9$rJQ99$7$F$3$N5!G=$r2~JQ$G$-$J$$$G$7$g$&$+!)(B


$B$3$NIi2YJ,;6AuCV$O>/!9JJ$,$"$j!"2<5-$N$h$&$J9=@.$G2TF0$7$^$9!#(B

      router(Internet)
         |
      Gateway(F/W)
      /     \
     /       \
  Web ---- $BIi2YJ,;6AuCV(B

$B%f!<%6$+$i8+$?;~$N(BWeb$B%5!<%P$N(BIP$B%"%I%l%9$O!"Ii2YJ,;6AuCV$,(Balias$B$7$F$$$F!"(B
$BMW5a$r<u$1$F$$$^$9!#!J$3$l$r8x3+MQ(BIP$B$H8F$S$^$9!K(B

$BIi2YJ,;6AuCV$G$O$=$N(BIP$B$KI3IU$1$F$"$k(BWeb$B%5!<%P$N(BMAC$B%"%I%l%9$r;XDj$7$F!"(B
Web$B%5!<%P$KAw$j$^$9!#(B

Web$B$G$O(B loopback-IF$B$K8x3+MQ(BIP$B$,(Balias$B$7$F$"$k$N$G!"@5>o$K%Q%1%C%H$r<u$1<h(B
$B$k$3$H$,$G$-!"(BWeb$B$NJVEz$r(Bdefault-router $B$G$"$k!"(BGateway$B$KAw$j$^$9!#(B
$B!JIi2YJ,;6AuCV$ODL$i$J$$!K(B

FB4.9$B$G$O2TF0$7$F$$$?$N$G$9$,!"(BFB5.2.1$B$G$O2TF0$7$J$/$J$C$F$7$^$$$^$7$?!#(B

$B%Q%1%C%H$r(BEthereal$B$G8+$?$H$3$m!"MW5a$r=P$7$?%5!<%P$H$O0[$J$k(BMAC$B%"%I%l%9(B
$B$KAw$k$3$H$K$J$k$?$a!"%Q%1%C%H$,(BWeb$B%5!<%P$G;_$^$C$F$$$^$7$?!#(B

$B$3$NF0$-$O!"%;%-%e%j%F%#E*$K$_$k$H:GE,$JF0:n$r$9$k$N$G$9$,!"AuCV$,;H$(L5(B
$B$/$J$k$N$O:$$j$^$9!#(B

$B!ZK\Bj![(B
$B$=$3$G!"%+!<%M%k$r%O%C%-%s%0$7$F$3$N%;%-%e%j%F%#$r$O$:$7$?$$$N$G$9$,!"(B
$B$I$3$i$X$s$r8+$l$P$h$$$G$7$g$&$+!)!!A4$/8!F$$,$D$-$^$;$s!#(B
F/W$B$NFbB&$@$1$G;H$&$b$N$G$9$N$G!"C1$K%;%-%e%j%F%#$,30$l$l$PLdBj$J$$$G$9!#(B
$B%U%!%$%kL>$r4v$D$+$*65$($$$?$@$1$k$@$1$G$b7k9=$G$9$N$G!"$46(NO4j$($^$;$s(B
$B$G$7$g$&$+!)(B



$B:G8e$K!"%Q%1%C%H$,$I$N$h$&$K$J$C$F$$$k$+$r2<5-$KJdB-$7$^$9!#(B
($B<B:]$O!"(BG/W$B$G(BNAT$BJQ49$7$F$$$^$9(B)

$B"#4D6-!JCm!'(BIP$B%"%I%l%9$O<B:]$N$b$N$G$O$"$j$^$;$s!K(B

Client   : 222.222.100.10
WebServer: 222.222.222.20

$B$D$^$j%f!<%6$+$i$O!"(Bhttp://222.222.222.20/ $B$r%"%/%;%9$9$k$3$H$K$J$j$^$9!#(B

1. Gateway$B$K$F(B
 Source     : 222.222.222.10
 Destination: 222.222.222.20
    $B"-(B NAT$BJQ49(B
 Source     : 222.222.222.10
 Destination: 10.10.10.10
         MAC: AA:AA:AA:AA:BB:BB (ARP$B%F!<%V%k$+$i<hF@(B)

2. $BIi2YJ,;6AuCV$K$F(B
 Source     : 222.222.222.10
 Destination: 10.10.10.10    (alias$B$G?6$C$F$"$k$N$GMW5a$r<u$1IU$1$k(B)
 MAC        : AA:AA:AA:AA:BB:BB
    $B"-(B $BIi2YJ,;6%=%U%H$G$N=q$-49$((B
 Source     : 222.222.222.10
 Destination: 10.10.10.10
         MAC: AA:AA:AA:AA:CC:CC ($B%=%U%H$G=q$-49$($F$$$k$h$&$@(B)

3. Web$B%5!<%P$K$F(B
 Source     : 222.222.222.10
 Destination: 10.10.10.10    (loopback$B$K(Balias$B$G?6$C$F$"$k(B)
         MAC: AA:AA:AA:AA:CC:CC
    $B"-(B Web$B$NMW5a$r%f!<%6$KJV$9(B
 Source     : 10.10.10.10
 Destination: 222.222.222.10
         MAC: AA:AA:AA:AA:AA:AA(default-route$B$KAw$k$+$i$3$&$J$k(B)

$B$I$&$d$i!"(B2$B$G(BMAC$B%"%I%l%9$r=q$-49$($F$$$k$H$3$m$KLdBj$,$"$k$h$&$K;W$$$^$9!#(B

$B$d$d$3$7$$OCBj$G?=$7Lu$"$j$^$;$s$,!"$h$m$7$/$*4j$$CW$7$^$9!#(B
-- 
Tatsuo Kusano <kusano@yubitoma.co.jp>


