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Date: Sun, 11 Apr 1999 04:21:10 +0900
From: Hiroki Sato <hrs@geocities.co.jp>
Organization: Science University of Tokyo, JAPAN
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References: <4.0.2-J.19990410024439.00ef3f10@unico-net.co.jp> <4.0.2-J.19990410164604.01041b60@unico-net.co.jp>
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Subject: [FreeBSD-net-jp 1491] Re: Bind 8.2 
	=?ISO-2022-JP?B?GyRCJEckThsoQg==?= No default TTL
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$B:4F#!wEl5~M}2JBg3X$G$9(B.

$B$A$g$C$H4*0c$$$7$F$$$kItJ,$,$"$j$^$7$?(B. $B:.Mp$5$;$F$7$^$C$F$9$$$^$;$s(B.
RFC2308 $B$+$i0zMQ$7$^$9(B. 

 # BIND $B$N<BAu$G(B, $B$I$N;~4|$K<h$j$3$^$l$?$N$+$ONI$/J,$+$j$^$;$s$,!D(B

>4 - SOA Minimum Field
>
>   The SOA minimum field has been overloaded in the past to have three
>   different meanings, the minimum TTL value of all RRs in a zone, the
>   default TTL of RRs which did not contain a TTL value and the TTL of
>   negative responses.
>
>   Despite being the original defined meaning, the first of these, the
>   minimum TTL value of all RRs in a zone, has never in practice been
>   used and is hereby deprecated.
>
>   The second, the default TTL of RRs which contain no explicit TTL in
>   the master zone file, is relevant only at the primary server.  After
>   a zone transfer all RRs have explicit TTLs and it is impossible to
>   determine whether the TTL for a record was explicitly set or derived
>   from the default after a zone transfer.  Where a server does not
>   require RRs to include the TTL value explicitly, it should provide a
>   mechanism, not being the value of the MINIMUM field of the SOA
>   record, from which the missing TTL values are obtained.  How this is
>   done is implementation dependent.
>
>   The Master File format [RFC 1035 Section 5] is extended to include
>   the following directive:
>
>                           $TTL <TTL> [comment]
>
>   All resource records appearing after the directive, and which do not
>   explicitly include a TTL value, have their TTL set to the TTL given
>   in the $TTL directive.  SIG records without a explicit TTL get their
>   TTL from the "original TTL" of the SIG record [RFC 2065 Section 4.5].
>
>   The remaining of the current meanings, of being the TTL to be used
>   for negative responses, is the new defined meaning of the SOA minimum
>   field.

 $B$H$$$&$3$H$G(B, $B%^%9%?%U%!%$%k$K(B default TTL $B$rL@<(E*$K<($9(B
 directive $B$rDI2C$7$F$/$@$5$$(B. $BDI2C$9$k>l=j$O(B, Sec.10 $B$K<($5$l$F$$$k(B
 $BNc$N$h$&$K(B, $B;q8;%l%3!<%I$h$jA0$G$9(B.

>        $TTL 86400
>        $ORIGIN XX.EXAMPLE.
>        @       IN      SOA     NS1.XX.EXAMPLE. HOSTMATER.XX.EXAMPLE. (
>                                1997102000      ; serial
>                                1800    ; refresh (30 mins)
>                                900     ; retry (15 mins)
>                                604800  ; expire (7 days)
>                                1200 ) ; minimum (20 mins)

 $B%M%,%F%#%V%-%c%C%7%e$KBP$9$k3F(B TTL $B;XDj$NE,MQ$K4X$7$F$O(B,
 RFC2308 $B$=$N$b$N$K>\$7$/2r@b$5$l$F$$$^$9(B.

 # $B$?$@$7(B, BIND-8.2 $B$G$O;q8;%l%3!<%IKh$N(B TTL $B;XDj$,L5;k$5$l(B,
 # SOA $B$N(B minimun TTL $B$KCV$-49$o$C$F$7$^$&$H$$$&%P%0$,$"$j$^$9(B.
 # $B$3$l$O%(%i!<$K$O$J$j$^$;$s$,(B, 8.2.1($BL$8x3+(B) $B$G=$@5$5$l$kM=Dj$G$9(B.

 $BC1$K7Y9p$r>C$9L\E*$"$l$P(B, SOA $B$N(B minimum TTL $B$H(B
 $BF1$8$K@_Dj$9$l$PNI$$$H;W$$$^$9$,(B, $B$I$&$$$&2r<a$K$J$k$N$+$O(B
 $B0l1~L\$rDL$7$F$*$$$?$[$&$,NI$$$G$7$g$&(B.

-- 
| Hiroki Sato/HRS <hrs@geocities.co.jp>
|                 http://www.ed.noda.sut.ac.jp/%7Ej7397067/
| Science University of Tokyo
| Faculty of Science and Technology, Department of Electrical Engineering

