From owner-FreeBSD-net-jp@jp.freebsd.org  Tue Aug 12 23:57:08 1997
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Date: Tue, 12 Aug 1997 23:57:00 +0900
From: MIHIRA "Sanpei" Yoshiro <sanpei@yy.cs.keio.ac.jp>
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Subject: [FreeBSD-net-jp 61] Re: natd vs IP-fil(ipnat)
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 IP_Filter $B$7$+;H$C$?$3$H$,$J$$$N$G(B, $B$=$A$i$r(B natd $B$NOC$HHf3S$7$J$,(B
$B$i=q$-$^$9(B.

>> $B:#(B $B9M$($F$$$k;H$$J}$O(B
>>   $BFbB&$K$O(B private-address$B$rIU$1$k!#(B
>>   $BFbB&$+$i(B $B30$X$N(B Web,ftp,Realaudio(UDP) $B$J$I$r(BIP$B%"%I%l%9JQ49$7$FDL?.(B
>>   $B$7$?$$!#(B

o natd
>$B$3$l$O2DG=$G$9!#%U%!%$%"%&%)!<%k>e$K(B natd $B$r%$%s%9%H!<%k$9$k$@$1$G(B OK 
>$B$G$9!#(B

o IP_Filter
  RealAudio $B$O(B TCP $B$K$7$J$$$H$@$a$@$H;W$$$^$9(B. UDP $B$G$O(B, $B$o$?$7$O@.(B
$B8y$7$F$$$^$;$s(B. $BB>$O(B natd $B$HF1MM$G$9(B. 

# natd $B$O(B RealAudio $BMQ$N%3!<%I$,4^$^$l$F$$$k$N$G$7$g$&$+(B?
----------
>>   $B30$+$iCf$X$NDL?.$O(B $B$$$^$N$H$3$m$O$"$-$i$a$k!#(B
>> 	($B%a!<%k(B Web$B%5!<%P$O(B firewall$B%^%7%s$N>e$K=8Cf$9$k(B)

o natd
>$BD|$a$kI,MW$J$J$$$H;W$$$^$9$,(B...$B!#%a!<%k!"(BWeb$B!"(BFTP$B%5!<%P6&$KHs>o$K4JC1(B
>$B$K!V@_1D!W$G$-$^$9!#FC$K(B Web, FTP $B$K4X$7$F$O%U%!%$%"%&%)!<%k>e$G(B natd 
>$B$N%3%s%U%#%.%e%l!<%7%g%s%U%!%$%k>e$G$R$g$$$HCf$K%5!<%P$K8~$1$k$@$1$G(B 
>OK $B$G$9!#$^$?!"%a!<%k%5!<%P$K$D$$$F$b(B qmail $B$r;H$($P(B 30$BJ,$G$G$-$^$9!#(B

o IP_Filter
  $B2DG=$G$9(B, $BL@J82=$7$F$^$;$s$,$"$k$H$3$m$G;H$($F$$$^$9(B. 

	arp -s .... ... pub
	ipnat $B$N%3%s%U%#%.%e%l!<%7%g%s$G(B bimap $B$r;H$&$H$G$-$^$9(B. 

# $B$G$b(B, CU-SeeMe $B$O0l$DA0$N%a!<%k$NM}M3$G;H$($^$;$s(B. 
----------
>>   $B%a!<%k%5!<%P$J$I$r(B $BCf$KCV$$$F!"30$+$iCf$X$NDL?.$N$&$AFCDj$N%b%N$@$1(B
>>   $B$r8GDjE*$K%"%I%l%9JQ49$9$k!#(B
>> $B$3$&$$$&$N$O(B $B$G$-$^$9$+!)(B

o natd
>$B!VFCDj$N%b%N!W$H$$$&0UL#$,:#0l$D$h$/$o$+$j$^$;$s$,!"%a!<%k%5!<%P$K$D$$(B
>$B$F$O$d$C$F$_$?$3$H$O$"$j$^$;$s$,(B qmail$B$N%^%K%e%"%k$r8+$?$+$s$8$G$O4JC1(B
>$B@_Dj$G$-$=$&$G$9!#(B 

o IP_Filter
  $B$3$l$O(B, $BA05-$N$H$*$j(B, arp + bimap $B$G$G$-$k$H;W$$$^$9(B. 

# arp + bimap $B$NOC$OAa$a$K%I%-%e%a%s%H$+$7$?$$$G$9$M(B :-)

sanpei
$B;d$N>l9g(B, natd $B$rCN$i$J$+$C$?$N$G(B IP_Filter $B$r;H$$$^$7$?(B
