Moin itojun!
itojun@??? schrieb am Thursday, den 18. April 2002:
>>> looks like ph10's guess was correct, the A is being returned
>>> before the AAAA. i suspect my v6 friends would ask that AAAA be
>>> preferred even if it is not first.
>> I presume you mean in the case MX -> name -> two IP addresses, one
>> v4 and one v6 but not in the case MX -> two names, one has A and
>> one has AAAA where of course the MX preferences will determine the
>> order. Is it worth adding an option to Exim specially for this,
>> when your v6 friends can achieve what they want by suitable MX
>> records? I need more convincing...
> yes, this is the former case. other IPv6-ready applications (like
> telnet, ftp, ssh, whatever) uses IPv6 first when a name resolves
> to multiple addresses with mixed IPv6 ones and IPv4 ones. the
> methodology is good for transition (otherwise, we'll keep using
> IPv4 and transition never happens even if dual stack servers get
> deployed...).
And I completely agree with you. Even in my case (dig mx
lucifer.at/open-systems.org), I want v6 (AAAA) address to be returned
specifically "before" the v4 so that if the application can do IPv6.
Most apps on NetBSD by default already do this(e.g. ftp/telnet) and I
believe it should be the same for exim.
Kind Regards,
-Kevin
$ dig mx lucifer.at
; <<>> DiG 2.2 <<>> mx lucifer.at
;; res options: init recurs defnam dnsrch
;; got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 54253
;; flags: qr rd ra; Ques: 1, Ans: 3, Auth: 2, Addit: 6
;; QUESTIONS:
;; lucifer.at, type = MX, class = IN
;; ANSWERS:
lucifer.at. 6802 MX 0 ipv6.lucifer.at.
lucifer.at. 6802 MX 10 mail.open-systems.org.
lucifer.at. 6802 MX 20 mail.greenseek.net.
;; AUTHORITY RECORDS:
lucifer.at. 6802 NS ns1.zoneedit.com.
lucifer.at. 6802 NS ns5.zoneedit.com.
;; ADDITIONAL RECORDS:
ipv6.lucifer.at. 6802 AAAA 3ffe:1200:3028:8d6b::1
mail.open-systems.org. 19866 AAAA 3ffe:1200:3028:8d6b::1
mail.open-systems.org. 19866 A 24.84.17.242
mail.greenseek.net. 19866 A 207.194.231.38
ns1.zoneedit.com. 151780 A 207.228.252.101
ns5.zoneedit.com. 137364 A 207.41.71.245
;; Total query time: 37 msec
;; FROM: satan to SERVER: default -- 24.69.255.195
;; WHEN: Thu Apr 18 09:24:57 2002
;; MSG SIZE sent: 28 rcvd: 288
--
What makes the universe so hard to comprehend is that there's nothing
to compare it with.
