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[debian-users:34073] $B%2!<%H%&(B$B%'%$(B2$B8D$G(Biptables



$B2CF#$H?=$7$^$9!#(B

Kondara MNU/Linux 2.1$B$+$i$r(Bwoody$B$K>h$j49$($^$7$?!#(B

$B;d$N$H$3$m$O(BADSL$B$O(B1.5M$B$7$+$G$J$$$?$a!"(BCATV$B2s@~$rJL$KMQ0U$7$^$7$?!#(B
$B%5!<%P!<$N%5!<%S%9$O!"(BADSL+$B8GDj(BIP$B$GDs6!$7!"(BLAN$B$+$i(BWAN$B$X$N@\B3$O(BCATV$B$K$H(B
$B$$$&7A$r$H$j$?$$$N$G$9$,!"%G%U%)%k%H%2!<%H%&%'%$$N07$$$K:$$C$F$$$^$9!#(B

                  Debian Linux Box
---ADSL------[ eth0                      ]
             [                           ]
---CATV------[ eth1  <--iptables-->  eth2]----LAN

qmail(smtp)$B$J$I$N%5!<%P!<$,F0$$$F$$$k$?$a!"%G%U%)%k%H%2!<%H%&%'%$$O!"(B
eth0$B$K$J$C$F$$$J$$$H%a!<%k$,Aw?.$G$-$^$;$s!#(B

$B$7$+$7!"(Beth1 <-> eth2 (CATV-LAN$B4V!K$G(Bip$B%^%9%+%l!<%I$r$+$1$k$K$O!"(B
eth1$B$,%G%U%)%k%H%2!<%H%&%'%$$K$J$C$F$$$J$$$H%Q%1%C%H$,Ht$s$G$/$l$^$;$s!#(B
$IPTABLES -t nat -A POSTROUTING -s $LAN_NET -o $ETH1 -j MASQUERADE

route$B%3%^%s%I$G$$$m$$$m;n$7$^$7$?$,!"(BADSL$B$+$i$-$?%Q%1%C%H$r$-$A$s$H(BADSL
$BB&$KJV$9@_Dj$,$I$&$7$F$b$G$-$^$;$s!#(B
$B$3$N$h$&$JL7=b$r2r7h$9$kJ}K!$O$4$6$$$^$9$G$7$g$&$+!)(B

$B$h$m$7$/$*4j$$$7$^$9!#(B