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Re: UDP packet/DNS server
- From: Roeland M.J. Meyer
- Date: Wed Sep 30 01:52:19 1998
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:
>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. :-)
>= = = = = =
>Business Network Telecom (BNT)
>TEL 03-5687-3945 FAX 03-5687-6009
>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.
>> >@ 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
>> >why is this bad?
>> >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
>> >>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 188.8.131.52
>> >> mx 0 mail
>> >>. etc ..
>> >>jamie rishaw (efnet:gavroche) American Information Systems,
>> >> 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
>> > email@example.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)
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