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Proxy ARP mini-HOWTO</title>
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<A HREF="INDEX-JF.html">JF-INDEX (document list of JF Project)</A>
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<H1>Proxy ARP mini-HOWTO</H1>
<H2>Al Longyear, <longyear@netcom.com></H2>December 5, 1994
<H2>$B@nEg(B $B9@(B, <kei@sm.sony.co.jp></H2>October 1, 1996
<P><HR>
<EM>Proxy ARP $B$N@_DjJ}K!(B</EM>
<HR>
<P><B>$BCm0U(B: $B$3$NJ8=q$O$+$J$j0JA0$K=q$+$l$?$b$N$J$N$G!"(B
$B$$$^$I$-$N(B Linux $B4D6-$K$O$"$F$O$^$i$J$$2U=j$,$"$j$^$9!#(B
(JF Project)</B>
<P>
<H2><A NAME="toc1">1.</A> <A HREF="#s1">$B%$%s%H%m%@%/%7%g%s(B</A></H2>
<P>
<H2><A NAME="toc2">2.</A> <A HREF="#s2">$B%O!<%I%&%(%"B&$+$i8+$?%M%C%H%o!<%/(B</A></H2>
<P>
<H2><A NAME="toc3">3.</A> <A HREF="#s3">III. $B%W%m%/%7(B ARP $B$r;H$&M}M3(B</A></H2>
<P>
<H2><A NAME="toc4">4.</A> <A HREF="#s4">TCP/IP $B%k!<%F%#%s%0(B</A></H2>
<P>
<H2><A NAME="toc5">5.</A> <A HREF="#s5">$B%W%m%/%7(B ARP $B$K$h$k%k!<%F%#%s%0(B</A></H2>
<P>
<H2><A NAME="toc6">6.</A> <A HREF="#s6">$B%W%m%/%7(B ARP $B$,$&$^$/F0:n$7$J$$>l9g(B</A></H2>
<P>
<H2><A NAME="toc7">7.</A> <A HREF="#s7">$B%W%m%/%7(B ARP $B$NLdBjE@$HHr$1$J$1$l$P$$$1$J$$$3$H(B</A></H2>
<P>
<H2><A NAME="toc8">8.</A> <A HREF="#s8">$B%W%m%/%7(B ARP $B$r;H$&;v$O$G$-$J$$$,!"F1MM$N5!G=$r<B8=$7$?$$>l9g$K$O!)(B</A></H2>
<P>
<H2><A NAME="toc9">9.</A> <A HREF="#s9">$B7kO@(B</A></H2>
<P>
<H2><A NAME="toc10">10.</A> <A HREF="#s10">$BF|K\8lLu$K$D$$$F(B</A></H2>
<HR>
<H2><A NAME="s1">1.</A> <A HREF="#toc1">$B%$%s%H%m%@%/%7%g%s(B</A></H2>
<P>$B$3$N%I%-%e%a%s%H$O(B Linux $B>e$G(B PPP $B$d(B SLIP $B%5!<%P%G%P%$%9$H$H$b$K(B
$B%W%m%/%7(B ARP (Address Resolution Protocol) $B$r;H$*$&$H9M$($F$$$k?M(B
$B$rBP>]$K$7$F=q$+$l$F$$$^$9!#(B
$BB>$NJ88%$G$O!"%W%m%/%7(B ARP $B$r(B $B!V(Bgracious ARP$B!W(B ($B0&A[$N$h$$(B ARP)$B$J$I$H(B
$B8F$s$G$$$k$3$H$b$"$j$^$9!#(B
$B%W%m%/%7(B ARP $B$r;H$$$?$$$H$$$&MW5a$O$h$/=P$^$9!#$3$l$,;H$($J$$>l9g!"(B
$B%=%U%H%&%(%"$NITNI$@$H9M$(!"$J$<;H$($J$/$J$C$F$7$^$C$?$N$@$m$&!"(B
$B$H$$$V$+$k?MC#$b$$$^$9!#(B
<P>$B$3$N%I%-%e%a%s%H$,=u$1$H$J$C$F!"%W%m%/%7(B ARP $B$O$I$N$h$&$J$H$-$KM-MQ$G!"(B
$B$I$N$h$&$J$H$-$K$O;H$o$J$/$F$b$h$$$N$+$r$h$/M}2r$7$F$b$i$($k$h$&(B
$B4j$C$F$$$^$9!#(B
<P>$B%W%m%/%7(B ARP $B$r;H$&$H!"!V(B($B%W%m%/%7(B)$B%5!<%P!W$K$*$1$k7PO)%F!<%V%k$5$((B
$BJQ99$9$l$P!"B>$N%7%9%F%`$G$O7PO)%F!<%V%k$rJQ99$9$kI,MW$,$"$j$^$;$s!#(B
$B$3$N$3$H$O!"%j%b!<%H%7%9%F%`$NF0E*$J%M%C%H%o!<%/@\B3$,2DG=$K$J$k$H(B
$B$$$&$3$H$r0UL#$7$F$$$^$9!#(B
<P>$B$3$3$G!"!V%5!<%P!W$H8F$s$G$$$k$N$O!"$"$k0UL#$G$O8m$j$+$b$7$l$^$;$s!#(B
TCP/IP $B$O!"%T%"!<%D!<%T%"!<(B($BBPEy(B)$B$N%M%C%H%o!<%/4D6-$@$+$i$G$9!#(B
$BB>$N%7%9%F%`$G$O!"%5!<%P!<$,;q8;$rDs6!$9$k$3$H$G!"!V6&M-!W$5$l!"(B
$B%/%i%$%"%s%H$O$3$l$r!VMxMQ!W$7$^$9$,!"(BTCP/IP $B$K$O!"$3$N<j$N(B
$B%/%i%$%"%s%H!?%5!<%P!<4X78$O$"$j$^$;$s!#(B
$B$H$O$$$(!"!VEEOC$r<h$k%3%s%T%e!<%?!W$r%5!<%P$H8F$S!"(B
$B!VEEOC$r2M$1$k%3%s%T%e!<%?!W$r%/%i%$%"%s%H$H8F$V$N$OJXMx$G$9$h$M!#(B
<P>Linux $B$N%M%C%H%o!<%/%=%U%H$O(B $B%W%m%/%7(B ARP $B$rD>@\%5%]!<%H$7$F$$$^$9(B
$B$N$G!"B>$N%7%9%F%`$G;H$o$l$F$$$k(B proxyarpd $B$N$h$&$JFCJL$J%G!<%b%s(B
$B$OI,MW$"$j$^$;$s!#(B
<P>PPP $B$r%5%]!<%H$9$k%3!<%I!J(Bpppd$B!K$H!"(BSLIP $B$r%5%]!<%H$9$k%3!<%I!J$N>/(B
$B$J$/$H$b0l$D!"(Bdip-uri$B!K$NN>J}$,(B proxy ARP $B$r%5%]!<%H$7$F$$$k$O$:$G$9!#(B
$B$3$l$K2C$(!"%M%C%H%o!<%/MQ%W%m%0%i%`(B ARP $B$b7PO)%F!<%V%k$r4IM}$7!"(B
$BI=<($9$k$3$H$,$G$-$k$O$:$G$9!#(B
<P>$B%W%m%/%7(B ARP $B$,$I$N$h$&$KF0:n$7!"$I$s$J;~$K;H$o$l$k$N$+$rM}2r$9$k(B
$B$?$a$K$O!"0lHLE*$K%M%C%H%o!<%/$,$I$N$h$&$K5!G=$9$k$N$+$K$D$$$F(B
$B4pK\E*M}2r$,I,MW$G$9!#(B
$B0J2<$N(B3$B$D$N>O$G$O(B TCP/IP $B%M%C%H%o!<%/$,$I$N$h$&$K5!G=$7!"%k!<%F%#%s%0$,(B
$B$I$&$$$&Iw$KF0:n$9$k$N$+!"$r4JC1$K=R$Y$^$9!#(B
<P>
<P>
<HR>
<H2><A NAME="s2">2.</A> <A HREF="#toc2">$B%O!<%I%&%(%"B&$+$i8+$?%M%C%H%o!<%/(B</A></H2>
<P>$B%$!<%5%M%C%H$d%H!<%/%s%j%s%0$r;H$C$?%M%C%H%o!<%/$O$9$Y$F(B MAC
(Media Access Control) $B%"%I%l%9$r;H$C$F<B8=$5$l$F$$$^$9!#(B
$B$3$l$O$=$l$>$l$N%3%s%H%m!<%i!<$K3d$jEv$F$i$l$?%O!<%I%&%(%"%"%I%l%9(B
$B$G$"$j!"$=$l$>$l$N(B MAC $B%"%I%l%9$O@$3&Cf$GM#0l(B(unique)$B$N$b$N$G$9!#(B
$B$3$l$O%3%s%H%m!<%i!<$N%a!<%+$,3d$jEv$F$^$9!#(B
$B%=%U%H%&%(%"$K$h$C$FJQ99$9$k$3$H$b2DG=$G$9$,!"0lHLE*$J0UL#$G$O(B
$B%k!<%k0cH?$G$9!#(B
<P>IP $B%"%I%l%9$O(B $B!V(BARP $B%-%c%C%7%e!W(B $B$H8F$P$l$k!"%=%U%H%&%(%">e$NFCJL$J(B
$B%F!<%V%k$K$h$C$F(B MAC $B%"%I%l%9$KJQ49$5$l$^$9!#(B
$B%M%C%H%o!<%/%=%U%H$,!"(B IP $B%Q%1%C%H$r;XDj$5$l$?%"%I%l%9$KAw$k;~(B
$B$K$O!"(BMAC $B%"%I%l%9$rCN$k$?$a$K$3$N%-%c%C%7%e$r8!:w$7$^$9!#(B
$B%-%c%C%7%e$NCf$K$J$+$C$?>l9g$K$O!"(B IP $B%"%I%l%9$+$i(B MAC $B%"%I%l%9(B
$B$KJQ49$9$k$?$a$K!"%M%C%H%o!<%/$K@\B3$5$l$F$$$k$9$Y$F$N%7%9%F%`$K(B
$BBP$7$FFC<l$JMW5a$rH/9T$7$^$9!#(B
$B$3$l$,(B ARP (Address Resolution Protocol)$BMW5a$H8F$P$l$F$$$k$b$N$G$9!#(B
<P>ARP $BMW5a$KBP$7$F$O(B $B$=$l$KBP1~$9$k(B MAC $B%"%I%l%9$,JV$5$l$^$9!#(B
$B$3$N(B MAC $B%"%I%l%9$O!"<!$K$O(B ARP $B$r;H$o$J$/$F:Q$`$h$&$K!"%-%c%C%7%e(B
$B$KC_$($i$l$^$9!#(B
<P>$B%W%m%/%7(B ARP $B$O$3$N;EAH$_$r;H$C$F!"%j%b!<%H@\B3$r$&$^$/=hM}$9$k$3$H$,(B
$B$G$-$k$o$1$G$9!#(B
<P>$B%-%c%C%7%e$NCf$N%(%s%H%j!<$r:o=|$9$k%k!<%k$b$"$j$^$9$,!"$3$N(B
$B%I%-%e%a%s%H$G$O$=$l$K$D$$$F$O?($l$^$;$s!#$3$l$K4X$7$F$O(B
IP $B%M%C%H%o!<%/$K4X$9$k%I%-%e%a%s%H$r;2>H$7$F2<$5$$!#(B
<P>($B%H!<%/%s%j%s%0$O3+H/Cf$G!"%F%9%H%Y!<%9$G$OMxMQ2DG=$G$9$,!"(B
Linux $B$N0lHLE*$J%M%C%H%o!<%/G^BN$H$$$&0UL#$G$O$d$O$j%$!<%5%M%C%H(B
$B$G$9!#$G$9$+$i$3$3$+$i@h!"!V%$!<%5%M%C%H!W$H$$$&8@MU$r;H$$$^$9!#(B
$BF1MM$N5!G=$O%H!<%/%s%j%s%0$G$b;H$($^$9!#%H!<%/%s%j%s%0$N(B
$B%=!<%9%k!<%F%#%s%0$K4X$o$j$J$/!#(B)
<P>
<P>
<HR>
<H2><A NAME="s3">3.</A> <A HREF="#toc3">III. $B%W%m%/%7(B ARP $B$r;H$&M}M3(B</A></H2>
<P>$BL\E*$O!"$R$H$D$N%M%C%H%o!<%/%"%@%W%?$KBP$7$F!"(B2$B$D0J>e$N(B
IP $B%"%I%l%9$r3d$jEv$F$k$3$H$K$"$j$^$9!#(B
<P>$B$3$l$O!"%$!<%5%M%C%H%3%s%H%m!<%i$N%O!<%I%&%(%"%"%I%l%9$KBP1~$7$?!"(B
$BDI2C$N(B IP $B%"%I%l%9$N%(%s%H%j!<$r(B ARP $B%-%c%C%7%e$K@8@.$9$k$3$H$G(B
$B<B8=$5$l$^$9!#(B
$B$3$l$K$h$C$F!"(B IP $B%"%I%l%9$r%O!<%I%&%(%"(B (MAC) $B%"%I%l%9$KJQ49$9$k(B
ARP $BMW5a$KBP$7$F(B Linux $B%7%9%F%`$O$&$^$/1~Ez$9$k$3$H$,$G$-$k$o$1(B
$B$G$9!#(B
<P>
<P>
<HR>
<H2><A NAME="s4">4.</A> <A HREF="#toc4">TCP/IP $B%k!<%F%#%s%0(B</A></H2>
<P>[$BA0$b$C$F$*$3$H$o$j$7$^$9$,!"$3$3$G$O!"!V%9%Q%s%K%s%0!&%D%j!<(B
(spanning-tree)$B!W%k!<%F%#%s%0$K$D$$$F=R$Y$F$*$j!"(BIP $B%Q%1%C%H$N(B
$B!V%=!<%9!&%k!<%F%#%s%0(B(source-routing)$B!W$G$O$"$j$^$;$s!#(B
$B%H!<%/%s%j%s%0$G$O%=!<%9%k!<%F%#%s%0$,;H$o$l$^$9$,!"$3$l$O(B IP $B$N(B
$B%=!<%9%k!<%F%#%s%0$G$O$J$/!"!J%H!<%/%s%j%s%0$N!K(BMAC $BAX$G9T$o$l$F(B
$B$k$b$N$G$9!#(B
$B%H!<%/%s%j%s%0$G(B MAC $B%=!<%9%k!<%F%#%s%0$r9T$C$F$$$k$N$O!"$=$l$,(B
$B%H!<%/%s%j%s%0$K$h$k%Q%1%C%H$NG[Aw$KI,MW$@$+$i$G$9!#(B
$B0lHLE*$K$O(B IP $B%=!<%9%k!<%F%#%s%0$r;H$&;v$O?d>)$G$-$^$;$s!#(B]
<P>$B%W%m%/%7(B ARP $B$K$D$$$F$b$C$H>\$7$/CN$k$?$a$K$O!"(BIP $B%Q%1%C%H$,(B
$B%M%C%H%o!<%/>e$G$I$N$h$&$K%k!<%F%#%s%0$5$l$k$N$+$rCN$kI,MW$,$"$j$^$9$,!"(B
$B$3$3$G$O$"$^$j>\$7$/=R$Y$k$D$b$j$O$"$j$^$;$s!#(B
$B>\$7$$>pJs$rCN$j$?$$J}$K$O!"?<$/2r@b$5$l$?!"$?$/$5$s$NK\$,$"$j$^$9!#(B
($BK\$,7y$$$G$7$?$i!"(BRFC $B%I%-%e%a%s%H$r$*FI$_$/$@$5$$!#(B)
<P>IP $B%Q%1%C%H$O!"$=$l$,7PM3$9$k%M%C%H%o!<%/$N$=$l$>$l$NCJ3,$G(B
$B%k!<%F%#%s%0$5$l$^$9!#$=$l$>$l$N%[%9%H!"%k!<%?!<!"%2!<%H%&%(%$(B
$B$O!"$=$l$>$l$,7PO)%F!<%V%k>pJs$N%3%T!<$r=jM-$7!"$=$l$K(B
$B$b$H$E$$$F$=$l$>$l$N(B IP $B%Q%1%C%H$r$I$3$KAw$l$P$h$$$+$r7hDj$7$^$9!#(B
<P>$B%k!<%F%#%s%0$O!"!V(BIP $B%M%C%H%o!<%/!W(B $B$r;H$C$F9T$J$o$l$^$9!#(B
$B$=$l$>$l$N%M%C%H%o!<%/%$%s%?!<%U%'!<%9$K$O!"%f%K!<%/$J(B IP
$B%M%C%H%o!<%/$H!"(BIP $B%"%I%l%9!"%M%C%H%^%9%/$,3d$jEv$F$i$l$F$$$^$9!#(B
$B!V(BIP $B%M%C%H%o!<%/!W(B $B$H$O!"C1=c$K(BIP $B%"%I%l%9$H(B $B%M%C%H%^%9%/$N%S%C%H(B
$B$4$H$N@Q$r$H$C$?$b$N$G$9!#Nc$($P!"(BIP $B%"%I%l%9(B 10.124.35.40 $B$G!"(B
$B%M%C%H%^%9%/$,(B 255.255.0.0 $B$N>l9g$K$O!"!V(BIP $B%M%C%H%o!<%/!W(B $B$O!"(B
10.124.0.0 $B$H$J$j$^$9!#(B
$B$3$NNc$G$O%P%$%HC10L$N%M%C%H%^%9%/$r;H$C$F$$$^$9$,!"%P%$%HC10L$G$O(B
$B$J$$%M%C%H%^%9%/(B($BLuCm(B:$BNc$($P%5%V%M%C%F%#%s%0$7$?;~$J$I(B)$B$N>l9g$G$b(B
$BF1MM$G$9!#(B
<P>Linux $B$O%M%C%H%^%9%/$r7PO)%(%s%H%j!<$H4XO"$E$1$^$9!#(B
$B%7%9%F%`$K7PO)$rIU$12C$($k;~(B ($BLuCm(B: route $B%3%^%s%I$J$I(B) $B$K$O!"(B
$B$=$N(BIP $B%"%I%l%9$H4XO"$9$k9T$-@h$N%G%P%$%9$r;XDj$7$^$9$,!"(B
$B$3$N:]$K%M%C%H%^%9%/$r;XDj$7$J$1$l$P!"(Bifconfig $B$G$=$N%G%P%$%9(B
$B$r@_Dj$7$?$H$-$K;XDj$7$?%G%U%)!<%k%H%M%C%H%^%9%/$,;H$o$l$^$9!#(B
<P>$B%k!<%F%#%s%0$K4X$7$F$NM}2r$r=u$1$k$?$a$K!"<!$N$h$&$J9=@.$N(B
$B%7%9%F%`$r9M$($F$_$^$7$g$&!#(B
<P>
<BLOCKQUOTE><CODE>
<PRE>
Destination Netmask Gateway Flags Device
10.124.0.0 255.255.0.0 0.0.0.0 U eth0
10.125.0.0 255.255.0.0 0.0.0.0 U eth1
10.126.0.0 255.255.0.0 10.125.31.1 UG eth1
10.124.12.5 255.255.255.255 0.0.0.0 UH ppp0
0.0.0.0 0.0.0.0 10.124.25.1 U eth0
</PRE>
</CODE></BLOCKQUOTE>
<P>$B$3$N%7%9%F%`$O(B3$B$D$N%M%C%H%o!<%/%G%P%$%9$r;}$C$F$$$^$9!#(B
2$B$D$O%$!<%5%M%C%H%3%s%H%m!<%i$G!"(B1$B$D$O(B PPP $B%G%P%$%9$G$9!#(B
$B$3$l$i(B3$B$D$N$$$:$l$+$i$b(B IP $B%Q%1%C%H$OE~Ce$7!"$5$i$K$3$N%7%9%F%`(B
$B$rDL$8$F!"(B 3$B$D$N$I$N%G%P%$%9$KBP$7$F$b%Q%1%C%H$OE>Aw$5$l$^$9!#(B
<P>$B%G%U%)!<%k%H$N7PO)$O!">e$N%(%s%H%j!<$G<($5$l$F$$$kDL$j!"(B
10.124.25.1 $B$N%2!<%H%&%(%$%G%P%$%9$G$9!#(B
$B%2!<%H%&%(%$$KAw$k$?$a$K$O(B eth0 $B%3%s%H%m!<%i$,;H$o$l$^$9!#(B
<P>PPP $B%G%P%$%9$,(B1$B$D@\B3$5$l$F$*$j!"$=$N(B IP $B%"%I%l%9$O(B 10.124.12.5
$B$G$9!#(B
<P>eth0 $B%G%P%$%9$O(B IP $B%M%C%H%o!<%/(B 10.124.0.0 $B>e$K$"$j!"(Beth1 $B%G%P%$%9$O(B
IP $B%M%C%H%o!<%/(B 10.125.0.0$B>e$K$"$j$^$9!#(B
<P>$B$5$i$K!"(BIP $B%"%I%l%9(B 10.125.31.1 $B$N%2!<%H%&%(%$$rDL$8$FMxMQ2DG=$J(B
IP $B%M%C%H%o!<%/(B 10.126.0.0 $B$X$N%M%C%H7PO)$,B8:_$7$^$9!#(B
<P>$B%k!<%F%#%s%0$,$I$N$h$&$K9T$o$l$k$N$+$rM}2r$9$k$?$a$K!"(B10.125.45.1
$B$KAw$i$l$k(B IP $B%Q%1%C%H$r9M$($F$_$^$7$g$&!#(B
<P>Linux $B$O7PO)%F!<%V%k$r8!:w$7!"$=$l$>$l$N%(%s%H%j$+$i%M%C%H%^%9%/$r(B
$B<h$j$@$7!"%S%C%H$4$H$N@Q$r$H$j!"9T$-@h$N(B IP $B%"%I%l%9$HHf3S$7$^$9!#(B
$B9gCW$7$?$i!"%Q%1%C%H$O$=$N%G%P%$%9$KAw$i$l$^$9!#(B
<P>$B7k2L$H$7$F!"(BIP $B%"%I%l%9(B 10.125.45.1 $B$N%Q%1%C%H$O!"(Beth1 $B%G%P%$%9$K(B
$BAw$i$l$^$9!#(B
<P>$BF1MM$K!"(B IP $B%"%I%l%9(B 10.124.12.6 $B$N%Q%1%C%H$O(B eth0 $B%G%P%$%9$KAw$i$l(B
$B$k$N$G$9$,!"(BIP $B%"%I%l%9(B 10.124.12.5 $B$N%Q%1%C%H$O(B ppp0 $B%G%P%$%9$K(B
$BAw$i$l$^$9!#(B
$B$J$<$J$i!"(Bppp0 $B%G%P%$%9$O(B 10.124.12.5 $B$H$$$&$?$@$R$H$D$N(B
IP $B%"%I%l%9$@$1$7$+<u$1<h$k$3$H$,$G$-$J$$$+$i$G$9!#(B
<P>10.126.31.4 $B08$N%Q%1%C%H$N>l9g$O$A$g$C$H0[$J$j$^$9!#(B
$B$3$N>l9g$K$O!"$3$N%"%I%l%9$K@\B3$5$l$?!V%2!<%H%&%(%$!W$,B8:_$9$k(B
$B$+$i$G$9!#(B
$B>e$G=R$Y$?$h$&$J$N$HF1$8J}K!$G8!:w$5$l$^$9$,!"$?$@C1$K(B eth1 $B%G%P%$%9(B
$B$KAw$i$l$k$N$G$O$J$/!"(B10.125.31.1 $B$H$$$&(B IP $B%"%I%l%9$N%7%9%F%`$K(B
$BAw$i$l$k$N$G$9!#$D$^$j!":G=*E*$J9T$-@h$N%"%I%l%9(B 10.126.31.4 $B$G$O$J$/!"(B
$B%2!<%H%&%(%$$N(B IP $B%"%I%l%9(B (10.125.31.1) $B$KBP1~$9$k(B MAC $B%"%I%l%9$K(B
$BAw$i$l$k$o$1$G$9!#(B
<P>10.125.31.1 $B$N%7%9%F%`$KE~Ce$7$?$i!"$=$N%7%9%F%`$N7PO)%F!<%V%k$r(B
$B;H$C$F!":G=*E*$J9T$-@h$N(B 10.126.31.4 $B$KE>Aw$5$l$^$9(B ($B$?$H$($P$=$N(B
$B%7%9%F%`$N(B eth3 $B%$%s%?!<%U%'!<%9$r;H$C$F(B)$B!#(B
<P>$B$3$N$h$&$J%k!<%F%#%s%0$G$O!"$$$m$$$m$J8m$j$,H/@8$7F@$^$9!#(B
$B$=$l$K$D$$$F$O$3$3$G$O$"$^$j?($l$?$/$"$j$^$;$s$,!"$?$H$($P!"(B
10.126.31.1 $B$,(B 10.126.31.4 $B$N%"%I%l%9$KBP$9$k7PO)$r;}$C$F$$$J$+$C$?>l9g!"(B
$B$b$H$b$H$NAw$j85$KBP$7$F!"(BICMP (Internet Control Message Protocol)
$B%Q%1%C%H$rAw$jJV$7!"!V$=$N%[%9%H$KBP$9$k7PO)$,L5$$!W$3$H$rCN$i$;$^$9!#(B
<P>
<P>
<HR>
<H2><A NAME="s5">5.</A> <A HREF="#toc5">$B%W%m%/%7(B ARP $B$K$h$k%k!<%F%#%s%0(B</A></H2>
<P>$B$5$F!"4pAC$H$7$FI,MW$JItJ,$K$D$$$F$O@bL@$,=*$o$C$?$N$G!"$3$N%I%-%e%a%s%H(B
$B$NL\E*$NItJ,$K0\$k$3$H$K$7$^$7$g$&!#(B
<P>$B%W%m%/%7(B ARP $B$r<B9T$7$F$$$k(B Linux $B$,!"(BIP $B%"%I%l%9$*$h$SBP1~$9$k%O!<(B
$B%I%&%(%"(B MAC $B%"%I%l%9$N%(%s%H%j$r(B ARP $B%-%c%C%7%e$K3JG<$9$k$3$H$H!"(B
$B$3$N%-%c%C%7%e$,(B IP $B%"%I%l%9$r(B MAC $B%"%I%l%9$KJQ49$9$k$N$K;H$o$l$k$H(B
$B$$$&$3$H$r;W$$=P$7$F2<$5$$(B
<P>$B%j%b!<%H%7%9%F%`$,(B IP $B%"%I%l%9(B 10.124.12.5 $B$K@\B3$9$k$H$-$K!"(BLinux
$B$O$3$N(B IP $B%"%I%l%9$H!"(Beth0 $B%3%s%H%m!<%i$KBP1~$9$k(B MAC $B%"%I%l%9$r(B ARP
$B%-%c%C%7%e$K3JG<$7$^$9!#(B
<P>$B$=$N8e$K(B IP $B%"%I%l%9(B 10.124.12.5 $B$r(B MAC $B%"%I%l%9$KJQ49$9$kMW5a(B (ARP)
$B$r<u$1<h$C$?>l9g!"$3$N%F!<%V%k$+$iF@$?%(%s%H%j!<$rMW5a85$KJV$7$^$9!#(B
$B$=$N7k2L!"$3$N(B IP $B%"%I%l%9$KAw$i$l$?%Q%1%C%H$O!"$$$C$?$s$3$N%5!<%P$K(B
$BAw$i$l!"%5!<%P$O$=$l$r%j%b!<%H%7%9%F%`(B (10.124.12.5) $B$KE>Aw$7$^$9!#(B
<P>$B$3$l$,(B $B%W%m%/%7(B ARP $B$N;EAH$_$G$9!#(B
$B%5!<%P$O(B $B%j%b!<%H$J(B IP $B%"%I%l%9$KBP$9$k(B proxy ($B$D$^$j!"BeM}?M!"$G$7$c$P$j20!"(B
$B!VI=8~$-$N!W?M$J$I$J$I(B) $B$H$7$F5!G=$9$k$o$1$G$9!#(B
$B$D$^$j!"(BARP $BMW5a$K1~Ez$9$k$3$H$G!"%j%b!<%H$J(B IP $B%"%I%l%9$KBP$9$k(B
$B%Q%1%C%H$r<u$1IU$1!"$=$l$i$rE>Aw$9$k$o$1$G$9!#(B
<P>$B$H$3$m$G!"%W%m%/%7(B ARP $B$,$&$^$/F0:n$9$k$?$a$K$O!"%j%b!<%H$J(B IP $B%"%I%l%9(B
($B$3$NNc$G$O(B 10.124.12.5) $B$O!"(B($BLuCm(B:$B%5!<%P$K@\B3$5$l$F$$$k(B) $B%M%C%H%o!<%/(B
$B%"%@%W%?$N(B IP $B%M%C%H%o!<%/$N$&$A$N0l$D$G$J$1$l$P$J$j$^$;$s!#(B
<P>$B$3$l$K$OFs$D$NM}M3$,$"$j$^$9!#(B
<P>$B0l$DL\$NM}M3$O!"%3%s%H%m!<%i$N(B MAC $B%"%I%l%9$O!"$=$l$KBP1~$9$k(B IP $B%"%I%l%9(B
$B$N(B ARP $B%-%c%C%7%e$K3JG<$5$l$k$+$i$G$9!#(BARP $B%-%c%C%7%e$O!"(BIP $B%"%I%l%9(B
$B$+$i(B MAC $B%"%I%l%9$X$NJQ49%F!<%V%k$J$N$G!"(BARP $B3d$jEv$F(B (assignment) $B$r(B
$B$*$3$J$&$?$a$K$O!"(BMAC $B%"%I%l%9$,I,MW$G$9!#(B
<P>$BFsHVL\$NM}M3$O!"%M%C%H%o!<%/>e$N$9$Y$F$N%7%9%F%`$O!"$=$l$>$lFH<+$K(B
$B%k!<%F%#%s%0$r$*$3$J$C$F$$$k$H$$$&E@$G$9!#(B
$B$7$+$7!"$=$l$>$l$N%7%9%F%`$O>/$J$/$H$b!"%j%b!<%H$J(B IP $B%"%I%l%9$KBP$7$F(B
IP $B%Q%1%C%H$rAw$k$?$a$K$O!"!V$=$l$HF1$8@~$K$D$J$,$C$F$$$k!W%5!<%P$N(B
$B%M%C%H%o!<%/%"%@%W%?$KAw$i$J$1$l$P$J$i$J$$$3$H$O$o$+$C$F$$$^$9!#(B
<P>($B9;@5<TCm(B:$B%j%b!<%H(B 10.124.12.5 $B$KBP$9$k(B Proxy ARP $B$r$"$F$,$&(B
$B%$%s%?!<%U%'!<%9$O!"(B10.124.0.0 $B%M%C%H%o!<%/$K@\B3$5$l$F$$$kI,MW$,$"$k!"(B
$B$H$$$&$3$H$G$7$g$&!#(B
$B$[$+$N%M%C%H%o!<%/$K$"$k%7%9%F%`$,(B 10.124.12.5 $B$K%Q%1%C%H$rAw$k>l9g!"(B
$B$H$j$"$($:(B 10.124.0.0 $B$N%M%C%H%o!<%/$^$GMW5a$rAw$jIU$1$F$/$k$O$:$J$N(B
$B$G!"%$%s%?!<%U%'!<%9$,(B 10.123.0.0 $B%M%C%H%o!<%/$J$I$K$"$C$F$b!"$=$b$=(B
$B$b(B ARP $BMW5a$,$"$C$?$3$H$,$o$+$j$^$;$s$+$i!#!J(BARP $BMW5a$O%M%C%H%o!<%/$K(B
$BBP$9$k%V%m!<%I%-%c%9%H$H$7$F<B9T$5$l$k$N$G$O$J$+$C$?$+$H;W$$$^$9!#!K(B)
<P>
<HR>
<H2><A NAME="s6">6.</A> <A HREF="#toc6">$B%W%m%/%7(B ARP $B$,$&$^$/F0:n$7$J$$>l9g(B</A></H2>
<P>$B%j%b!<%H$N(B IP $B%"%I%l%9$,!"(B10.124.12.5 $B$G$O$J$/$F!"Nc$($P(B 10.200.3.1 $B$N(B
$B>l9g$r9M$($F$_$^$7$g$&!#(B
<P>
<OL>
<LI>$B%j%b!<%H%7%9%F%`$O!"$3$N%"%I%l%9$r$I$3$KAw$C$?$i$$$$$+$o$+$i$J$$!#(B
<P>$B%j%b!<%H%7%9%F%`$,$o$+$C$F$$$k$N$O!"(BIP $B%M%C%H%o!<%/(B 10.124.0.0 $B$KAw$k(B
$B$?$a$K$O(B eth0 $B$K@\B3$5$l$F$$$k%1!<%V%k$K%Q%1%C%H$rAw$l$P$$$$!"$H$$$&(B
$B$3$H$@$1$G$9!#$7$+$7!"(B10.200.0.0 $B$H$$$&(B IP $B%M%C%H%o!<%/$O$"$j$^$;$s!#(B
$B$3$N08@h$N%Q%1%C%H$r$I$3$XAw$l$P$$$$$N$+$o$+$i$J$$$o$1$G$9!#(B
<P>
</LI>
<LI>ARP $B%(%s%H%j!<$r:n@.$9$k;~$K!"%5!<%P$OBP1~$9$k(B MAC $B%"%I%l%9$K(B
$BBP$7$F!"$I$N%3%s%H%m!<%i$r;H$($P$h$$$N$+$o$+$i$J$$!#(B
<P>$B$3$l$O!"%W%m%/%7(B ARP $B$r;H$*$&$H$7$F$b$&$^$/F0:n$7$J$$>l9g$K!":G$b$h$/$"$k(B
$B%1!<%9$G$9!#08@h$N(B IP $B%"%I%l%9$,!"<+J,$K@\B3$5$l$F$$$k%M%C%H%o!<%/(B
$B%$%s%?!<%U%'!<%9$K3d$jEv$F$i$l$F$$$k!"$$$:$l$N(B IP $B%M%C%H%o!<%/%"%I%l%9(B
$B$H$b0[$J$k$H$$$&>l9g$G$9!#(B
</LI>
</OL>
<P>
<P>
<HR>
<H2><A NAME="s7">7.</A> <A HREF="#toc7">$B%W%m%/%7(B ARP $B$NLdBjE@$HHr$1$J$1$l$P$$$1$J$$$3$H(B</A></H2>
<P>
<OL>
<LI>$BFCDj$N(B IP $B%"%I%l%9$KBP$7$F1~Ez$9$k(B $B%W%m%/%7(B ARP $B%(%s%H%j!<$O(B
$B$?$@0l$D$G$J$1$l$P$J$j$^$;$s!#(BBSD $B$N>l9g!"$"$k%"%I%l%9HO0O$K(B
$BBP$7$F(B $B%W%m%/%7(B ARP $B$r$*$3$J$&>l9g$K$O$=$N%"%I%l%9HO0O$,>WFM$7$J$$(B
$B$3$H$rJ]>Z$9$kI,MW$,$"$j$^$9!#(B
$B$3$l$O$D$^$j!"(BBSD $B%Y!<%9$N%M%C%H%o!<%/$G$O!"$"$k%M%C%H%o!<%/(B
$BA4BN$r$R$H$D$N%5!<%P$K3d$jEv$F$kI,MW$,$"$k$3$H$r0UL#$7$^$9!#(B
<P>$B$b$&0lEY6/D4$7$F$*$-$^$9$,!"$b$7(B ARP $BMW5a$KBP$7$FJ#?t$N1~Ez$r(B
$B<u$1<h$C$?>l9g!"(BBSD $B%7%9%F%`$G$OAjEv$R$I$$$3$H$K$J$j$^$9!#(B
<P>
</LI>
<LI>$B$9$G$K%M%C%H%o!<%/Cf$KB8:_$7$F$$$k%"%I%l%9$KBP$7$F!"%W%m%/%7(B ARP $B$r(B
$B<B9T$7$F$O$$$1$^$;$s!#(B
<P>$B$3$l$O!">e$G=R$Y$?LdBj$N$A$g$C$H$7$?%P%j%(!<%7%g%s$G$9!#%M%C%H%o!<%/(B
$B>e$K$9$G$KB8:_$9$k(BIP $B%"%I%l%9$KBP$9$k(B $B%W%m%/%7(B ARP $B$r<B9T$9$k$H!"(B
$B#2$D$N1~Ez$,@8@.$5$l$k$3$H$K$J$j$^$9!#(B
$B$D$^$j!"%5!<%P!<$,%j%b!<%H%7%9%F%`$H$N@\B3$K%W%m%/%7(B ARP $B$r(B
$BE,MQ$9$k>l9g$K!"8=:_%M%C%H%o!<%/$G;HMQCf$N(B IP $B%"%I%l%9$r(B
$B%j%b!<%H@\B3$KN.MQ$7$?$j$7$F$O$$$1$J$$!"$H$$$&$3$H$G$9!#(B
<P>($B9;@5<TCm(B:$BK\Mh$N(B IP $B%"%I%l%9$N%^%7%s$X$N%3%M%/%7%g%s$r%5!<%P$,2#<h$j(B
$B$7$F(B proxy ARP $B$K;H$C$F$7$^$&!"$D$^$jK\Mh$N%3%M%/%7%g%s$,@.N)$7$J$/(B
$B$J$k!"$H$$$&$3$H$G$O$J$$$+$H;W$$$^$9!#(B)
</LI>
</OL>
<P>
<P>
<HR>
<H2><A NAME="s8">8.</A> <A HREF="#toc8">$B%W%m%/%7(B ARP $B$r;H$&;v$O$G$-$J$$$,!"F1MM$N5!G=$r<B8=$7$?$$>l9g$K$O!)(B</A></H2>
<P>$B$"$J$?$,(B $B%W%m%/%7(B ARP $B$r;H$($J$$>l9g$K$O$$$/$D$+$NBeBX<jCJ$,$"$j$^$9!#(B
<P>$B$b$C$H$b4JC1$J$N$O!"A4$F$N%j%b!<%H%"%I%l%9$,$=$l$>$l$N(B IP $B%M%C%H%o!<%/(B
$B%"%I%l%9$r=jM-$G$-$k$h$&$K!"%j%b!<%H(B IP $B%"%I%l%9$r%5%V%M%C%H2=$7$F$7$^$&(B
$B$H$$$&J}K!$G$9!#(B
$B$=$7$F!"$=$l$>$l$N%k!<%?!<(B ($B$9$Y$F$N%[%9%H>e$G!"%2!<%H%&%(%$%"%I%l%9$H(B
$B$7$FI=<($5$l$F$$$k$9$Y$F$N%G%P%$%9$G$9!#(B) $B>e$K%M%C%H%o!<%/7PO)$r(B
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<P>$B$3$l$K$h$C$F!"$=$l$>$l$N%j%b!<%H(B IP $B%"%I%l%9$,@\B3$5$l$F$$$k%5!<%P$K(B
$BBP$7$F$=$N(B IP $B%M%C%H%o!<%/08$N!J%Q%1%C%H$,(B)$BAw$i$l$k$h$&$K$G$-$^$9!#(B
<P>($B9;@5<TCm(B: $B%j%b!<%H%^%7%s$N%"%I%l%9$r$^$H$a$F%5%V%M%C%H$K2!$79~$`(B ->
$B$=$N%5%V%M%C%H$X$N7PO)$r%2!<%H%&%'%$!J%5%V%M%C%H$X$N%2!<%H%&%'%$%^%7%s$N!"(B
$B85!9$N%2!<%H%&%'%$!K$K=q$/!#(B-> $B%5%V%M%C%H2=$7$?%M%C%H%o!<%/$X$N@\B3MW5a$,!"(B
$B%5%V%M%C%H$N%2!<%H%&%'%$$K$/$k$h$&$K$J$k!#$H$$$&$3$H$G$7$g$&$+!#(B)
<P>$B$3$NBe$o$j$K!"%k!<%?!<$H!"%5!<%P>e$N(B gated $B$r;H$&$H$$$&$3$H$b(B
$B$G$-$^$9!#(B
<P>IP $B%M%C%H%o!<%/$r%5%V%M%C%H2=$7$?$/$J$$>l9g$K$O!"$9$Y$F$N%[%9%H7PO)$r;XDj(B
$B$7$F$7$^$&!"$H$$$&J}K!$b$"$j$^$9!#(B
$B$D$^$j!"A4$F$N%j%b!<%H(B IP $B%"%I%l%9$=$l$>$l$KBP$7$F!"$=$l$>$l$N%k!<%?!<(B
$B%(%s%H%j!<$r;XDj$7$F$7$^$&$N$G$9!#(B
<P>$B%2!<%H%&%(%$$H%k!<%?!<>e$N>pJs$r%"%C%W%G!<%H$9$kI,MW$O$"$j$^$9$,!"(B
$B%M%C%H%o!<%/>e$NA4$F$N%[%9%H$rJQ99$9$kI,MW$O$"$j$^$;$s!#(B
<P>$B$=$l$>$l$N%[%9%H$,%k!<%?!<$K%Q%1%C%H$rAw$k;~$K;H$o$l$k%G%U%)!<%k%H%k!<%H(B
$B$rDL$8$F!"!V(BICMP re-direct $B%Q%1%C%H!W$,!"MW5a$rH/9T$7$?%[%9%H$KAw$i$l!"(B
$B$=$N7k2L!"$=$l$>$l$N%5!<%P>e$K%[%9%H7PO)$,<+F0E*$KDI2C$5$l$k$+$i$G$9!#(B
<P>
<P>
<HR>
<H2><A NAME="s9">9.</A> <A HREF="#toc9">$B7kO@(B</A></H2>
<P>$B%W%m%/%7(B ARP $B$,$I$N$h$&$KF0:n$7!"$I$N$h$&$J$b$N$+!"$r>/$7$G$b(B
$B@bL@$G$-$?$3$H$r4j$C$F$$$^$9!#(B
<P>pppd $B$d(B dip-uri $B$r;H$&>l9g$K$O!"$3$N5!3#$N$h$&$J<j=g$rCN$C$F$$$kI,MW$O(B
$B!J9,1?$J$3$H$K!K$"$j$^$;$s!#$3$l$i$N%=%U%H%&%(%"$,<+F0E*$K<B9T$7$F(B
$B$/$l$k$+$i$G$9!#(B
<P>$B%W%m%/%7(B ARP $B$OK|G=$N2r7h$G$O$"$j$^$;$s!#$$$/$D$+$N>l9g$K$&$^$/(B
$B5!G=$9$k2r7hJ}K!$K$9$.$^$;$s!#(B
<P>$B$"$J$?$N%M%C%H%o!<%/$NLdBj$K$3$N5!G=$,Lr$KN)$D$+$I$&$+!"<+J,$GH=CG$G(B
$B$-$k$3$H$r4|BT$7$F$$$^$9!#(B
<P>$B$b$C$H>pJs$,I,MW$JJ}$K$O!"(BW. Richard Stevens $B;a$K$h$k(B
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<P>
<P>
<HR>
<H2><A NAME="s10">10.</A> <A HREF="#toc10">$BF|K\8lLu$K$D$$$F(B</A></H2>
<P>$B$3$l$O!"(BLinux MINI-HOWTO $B$N!"(BProxy-ARP $B$NK]Lu$G$9!#(B
$B0ULu$bB?$/$"$j$^$9$,!"$4MF<O$/$@$5$$!#(B
$B$^$?!"8mLu$d!"$b$C$H$o$+$j$d$9$$Lu0F$J$I$"$j$^$7$?$i!"(B
$B$<$RLu<T$^$G%U%#!<%I%P%C%/$r$*4j$$CW$7$^$9!#(B
<P>
<PRE>
$BF|K\8lLu(B : $B@nEg(B $B9@(B (kei@sm.sony.co.jp)
$B9;@5(B : $BKY9>(B $B@?0l(B $B$5$s(B (shorie@ibm.net)
$B3{_7(B $BbCIW(B $B$5$s(B (k957134@sci.u-ryukyu.ac.jp)
$BCfLn(B $BIpM:(B $B$5$s(B (nakano@apm.seikei.ac.jp)
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sgml21html conversion date: Sat Mar 16 20:56:51 JST 2002
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