cname quick question

[Brad Knowles]

At 9:22 AM +0000 3/8/01, Jim Reid wrote:

>  I don't think so. If the applications query a BIND9 server, DNAME just
>  works:

	That's nice for BINDv9.  Do other nameservers cache the DNAME 
records and do all the same things (so that this works for everyone 
as soon as we upgrade just the advertised authoritative servers), or 
does this only work when the local and remote servers are both 
running BINDv9 (in which case we basically have to wait until such 
time as everyone has made the upgrade)?

>  There could be some issues for mail systems that get CNAMEs returned
>  when they look for MX records because of DNAME trickery but I don't
>  think these would be show-stoppers.

	It would be interesting to look into this subject. 
Unfortunately, my understanding of DNAMEs is basically nil.  Can you 
point me at an RFC that explains them in more detail?

--
Brad Knowles, <brad.knowles at skynet.be>

#!/usr/bin/perl -w
# 531-byte qrpff-fast, Keith Winstein and Marc Horowitz <sipb-iap-dvd at mit.edu>
# MPEG 2 PS VOB file on stdin -> descrambled output on stdout
# arguments: title key bytes in least to most-significant order
# Usage:
# qrpff 153 2 8 105 225 /mnt/dvd/VOB_FILE_NAME | extract_mpeg2 | mpeg2_dec -
$_='while(read+STDIN,$_,2048){$a=29;$b=73;$c=142;$t=255;@t=map{$_%16or$t^=$c^=(
$m=(11,10,116,100,11,122,20,100)[$_/16%8])&110;$t^=(72, at z=(64,72,$a^=12*($_%16
-2?0:$m&17)),$b^=$_%64?12:0, at z)[$_%8]}(16..271);if((@a=unx"C*",$_)[20]&48){$h
=5;$_=unxb24,join"", at b=map{xB8,unxb8,chr($_^$a[--$h+84])}@ARGV;s/...$/1$&/;$
d=unxV,xb25,$_;$e=256|(ord$b[4])<<9|ord$b[3];$d=$d>>8^($f=$t&($d>>12^$d>>4^
$d^$d/8))<<17,$e=$e>>8^($t&($g=($q=$e>>14&7^$e)^$q*8^$q<<6))<<9,$_=$t[$_]^
(($h>>=8)+=$f+(~$g&$t))for at a[128..$#a]}print+x"C*", at a}';s/x/pack+/g;eval