[colug-432] direct IPv6; July COLUG Meeting Announcement

R P Herrold herrold at owlriver.com
Mon Jul 25 15:20:58 EDT 2011

On Mon, 25 Jul 2011, Jim Wildman wrote:

> I'll attest to the ease of Russ's setup
> www6.rossberry.com and www.rossberry.com are the same box
> took about 10 minutes max.
> [root at jim-lt ~]# host www6.rossberry.com
> www6.rossberry.com has IPv6 address 2605:4400:1:781:216:3eff:fe31:f4b5
> [root at jim-lt ~]# host www.rossberry.com
> www.rossberry.com has address

The use of a separate 'www6' is not strictly necessary, 
although it makes testing easier not to have both an A and a 
AAAA record pointing to the same IP (v4 and v6) -- The 
resolver libraries pull and try the AAAA first, and failing 
that a well drafted application will fall back to the A record 
details.  See:
   man 3 getaddrinfo

This library is present in Windows 2000 and later with an add 
on service pack which Cygwin relies upon; Linux has had it 
forever; OS/X has had it forever and IPv6 (direct or Apple 
mediated tunnelling) is used 'behind the curtains' heavily 
along with a really nice, and unobtrusive certificate 
infrastructure by Apple

I studied Apple's design, and the poor designs of others 
(Microsoft, Rackspace, Amazon), in designing our interfaces 
for PMman

[herrold at centos-5 ~]$ host www.pmman.com
www.pmman.com is an alias for pmman.com.
pmman.com has address
pmman.com has IPv6 address 2605:4400:1:781:216:3eff:fe31:f4ee
pmman.com mail is handled by 30 mailgate.pmman.com.
pmman.com mail is handled by 10 mail.pmman.com.
pmman.com mail is handled by 20 trap.pmman.com.
[herrold at centos-5 ~]$

www.pmman.com is a CNAME to an A and AAAA record:
 	(dot) pmman.com.


The 'host' command is not useful for examining PRT records 
that I can figure out -- I use 'dig' there:

[root at www ~]# dig -x 2605:4400:1:781:216:3eff:fe31:f4ee

; <<>> DiG 9.3.6-P1-RedHat-9.3.6-16.P1.el5 <<>> -x 
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 57764
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, 


;; AUTHORITY SECTION: 1800 IN SOA   ns1.pmman.com. 
hostmaster.pmman.com. 2011071223 10800 3600 604800 1800

;; Query time: 17 msec
;; WHEN: Mon Jul 25 15:11:28 2011
;; MSG SIZE  rcvd: 150

... which is what is expected

- Russ herrold

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