Yeah, and if you do then sendmail will be broken, according to the v8.9.1 dox. It's called a wild-card MX record and is specifically not recommended, more than once, in the sendmail dox. I actually had NetCom tech support recommend it once, then I found out why it's not recommended, the hard way. When it comes to DNS, you're *much* better off by being specific, even if it means being verbose. At 10:39 AM 9/30/98 +0900, Tatsuya Kawasaki wrote:
Eric,
thank for your reply. Though I did not agree with RFC I understand what you are saying. Do you think it is about time to change RFC?
BTW, according to NDS and BIND 2nd Ed. by O'Reilly, it is okay for MX record too. :-)
TIA, Tatsuya
$B$+$o$5$-(B TK3197
= = = = = = Business Network Telecom (BNT) $B%S%8%M%9%M%C%H%o!<%/%F%l%3%`3t<02q<R(B $B")(B111-0053$B!!El5~ETBfEl6h@uAp66(B3-8-5 31$B;35~%S%k(B6$B3,(B TEL 03-5687-3945 FAX 03-5687-6009 http://www.giganet.net
On Tue, 29 Sep 1998, Eric Sobocinski wrote:
But it's perfectly ok for PTR records, though perhaps your example is less than ideal. The objection to the use of "*" was specific to NS records. An NS record should exist for a domain only if that domain exists. Since "*" matches any subdomain whether the domain exists or not, an NS record will be returned for non-existent subdomains and that violates the rule. Some records of other types are incompatible with "*" for similar reasons. The major point here is that any DNS record should reference either a valid response or another record that will lead to a response, and an NS record pointing to a zone file that doesn't exist is neither.
Some folks will contend that the use of "*" in PTR records is bad form even though it is legal. That's a religious war, not a technical one. (I happen to like the use of "*", though I also believe that one should first apply specific host names whenever a static mapping allows).
On Monday, 28 Sep 1998 at 21:02 EDT, Eric Germann wrote:
you have to admit, it does save one hell of a lot of typing for the 1918 IN-ADDR.ARPA delegations.
rfc1918.db ----------
@ IN SOA ns1.xxx.net. hostmaster.xxx.net. ( 1997101001 ; serial 300 ; refresh 300 ; retry 604800 ; expire 600) ; minimum
IN NS ns1.xxx.net. IN NS ns2.xxx.net.
* IN PTR rfc1918.xxx.net. -----------
then in named.bt
primary 16.172.in-addr.arpa RFC1918.DB primary 17.172.in-addr.arpa RFC1918.DB primary 18.172.in-addr.arpa RFC1918.DB primary 19.172.in-addr.arpa RFC1918.DB primary 20.172.in-addr.arpa RFC1918.DB primary 21.172.in-addr.arpa RFC1918.DB primary 22.172.in-addr.arpa RFC1918.DB primary 23.172.in-addr.arpa RFC1918.DB primary 24.172.in-addr.arpa RFC1918.DB primary 25.172.in-addr.arpa RFC1918.DB primary 26.172.in-addr.arpa RFC1918.DB primary 27.172.in-addr.arpa RFC1918.DB primary 28.172.in-addr.arpa RFC1918.DB primary 29.172.in-addr.arpa RFC1918.DB primary 30.172.in-addr.arpa RFC1918.DB primary 31.172.in-addr.arpa RFC1918.DB
repeat for 10.x.x.x and 192.168 space
To reiterate the question posed by the original poster, (donning asbestos), why is this bad?
Eric
At 08:31 AM 9/28/98 -0500, you wrote:
Tatsuya Kawasaki wrote:
xyz.com. IN NS that.host *.xyz.com In NS that.host
Gah!!
Illegal!
Never use "*" in DNS! Just makes /bad things/ happen.
@ IN SOA xyz.com. hostmaster.xyz.com. ( 1998092801 3600 1800 3600000 7200)
ns ns1.xyz.com. ns ns2.xyz.com.
mx 0 mail.xyz.com.
mail a 1.2.3.4 mx 0 mail
. etc ..
-- jamie rishaw (efnet:gavroche) American Information Systems, Inc. Tel:312.425.7140, FAX:312.425.7240 Help stop spam! router(config)#no ip routing thirty thousand feet above the earth..youre a beautiful thing..
========================================================================== Eric Germann CCTec ekgermann@cctec.com Van Wert, OH 45891 http://www.cctec.com Ph: 419 968 2640 Fax: 419 968 2641 Network Design, Connectivity & System Integration Services A Microsoft Solution Provider
___________________________________________________ Roeland M.J. Meyer, ISOC (InterNIC RM993) e-mail: <mailto:rmeyer@mhsc.com>rmeyer@mhsc.com Internet phone: hawk.mhsc.com Personal web pages: <http://www.mhsc.com/~rmeyer>www.mhsc.com/~rmeyer Company web-site: <http://www.mhsc.com/>www.mhsc.com/ ___________________________________________ I bet the human brain is a kludge. -- Marvin Minsky
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