I'm unable to get Centos 5 or 6 to install over IPv6. I'm using mirrors.kernel.org, which has a AAAA record. Here is the behavior that I see.
Centos 5 - Performs lookup for A record. Receives A record responses (IPv6 connectivity works). The installer does not query for an AAAA record.
Centos 6 - Performs neither A or AAAA record query.
I'm curious to hear if anyone has been successful installing Centos without IPv4 being activated.
Jeff L.
IPv6-only Installation
IPv6-only Installation
mirrors.kernel.org is not ipv6 only, it's dual-stack dns server.
so if you want install over ipv6, the domain must have ipv6 only dns server.
so if you want install over ipv6, the domain must have ipv6 only dns server.
Re: IPv6-only Installation
godspeed,
A resolver on an IPv6-only end-system should not query for A (IPv4) records. These are useless to the system. mirrors.kernel.org has an AAAA (IPv6) record. The installer needs to send a query for the AAAA record. For some reason, it is not doing so. I could hazard a guess that the developers did not test an installation with the IPv4 stack disabled. I'd like to hear from them before publishing my findings.
Jeff L.
A resolver on an IPv6-only end-system should not query for A (IPv4) records. These are useless to the system. mirrors.kernel.org has an AAAA (IPv6) record. The installer needs to send a query for the AAAA record. For some reason, it is not doing so. I could hazard a guess that the developers did not test an installation with the IPv4 stack disabled. I'd like to hear from them before publishing my findings.
Jeff L.
Re: IPv6-only Installation
yes. i know installer not send query for AAAA record.
but, i test ipv6 only dns server at 2009, if the remote dns server is dual-stack and the client(local ipv6 dns server) is ipv6 only, you can't get any ipv6 record.
[root@mailtest source]# dig mirrors.kernel.org any
; > DiG 9.3.6-P1-RedHat-9.3.6-4.P1.el5 > mirrors.kernel.org any
;; global options: printcmd
;; Got answer:
;; ->>HEADER> DiG 9.3.6-P1-RedHat-9.3.6-4.P1.el5 > www.tyut6.edu.cn
;; global options: printcmd
;; Got answer:
;; ->>HEADER> DiG 9.3.6-P1-RedHat-9.3.6-4.P1.el5 > www.tyut6.edu.cn any
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 50182
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 0
;; QUESTION SECTION:
;www.tyut6.edu.cn. IN ANY
;; ANSWER SECTION:
www.tyut6.edu.cn. 31443 IN AAAA 2001:250:c01::11:246
;; AUTHORITY SECTION:
tyut6.edu.cn. 31443 IN NS dns1.tyut6.edu.cn.
tyut6.edu.cn. 31443 IN NS dns2.tyut6.edu.cn.
;; Query time: 3 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Wed Jul 20 15:52:06 2011
;; MSG SIZE rcvd: 100
but, i test ipv6 only dns server at 2009, if the remote dns server is dual-stack and the client(local ipv6 dns server) is ipv6 only, you can't get any ipv6 record.
[root@mailtest source]# dig mirrors.kernel.org any
; > DiG 9.3.6-P1-RedHat-9.3.6-4.P1.el5 > mirrors.kernel.org any
;; global options: printcmd
;; Got answer:
;; ->>HEADER> DiG 9.3.6-P1-RedHat-9.3.6-4.P1.el5 > www.tyut6.edu.cn
;; global options: printcmd
;; Got answer:
;; ->>HEADER> DiG 9.3.6-P1-RedHat-9.3.6-4.P1.el5 > www.tyut6.edu.cn any
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 50182
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 0
;; QUESTION SECTION:
;www.tyut6.edu.cn. IN ANY
;; ANSWER SECTION:
www.tyut6.edu.cn. 31443 IN AAAA 2001:250:c01::11:246
;; AUTHORITY SECTION:
tyut6.edu.cn. 31443 IN NS dns1.tyut6.edu.cn.
tyut6.edu.cn. 31443 IN NS dns2.tyut6.edu.cn.
;; Query time: 3 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Wed Jul 20 15:52:06 2011
;; MSG SIZE rcvd: 100
Re: IPv6-only Installation
[quote]but, i test ipv6 only dns server at 2009, if the remote dns server is dual-stack and the client(local ipv6 dns server) is ipv6 only, you can't get any ipv6 record.[/quote]
local domain(ipv6 only) has dns server and cliet, client nameserver is local dns server.
if the remote dns server is dual-stack, you can't get any 4A record.
local domain(ipv6 only) has dns server and cliet, client nameserver is local dns server.
if the remote dns server is dual-stack, you can't get any 4A record.
Re: IPv6-only Installation
godspeed,
I'm having difficulty parsing your statements. It sounds as though you are suggesting that dual-stack DNS servers won't return AAAA records over IPv6 transport. If this were true, there would be a lot of IPv6-only end stations that would be useless right now.
Jeff L.
I'm having difficulty parsing your statements. It sounds as though you are suggesting that dual-stack DNS servers won't return AAAA records over IPv6 transport. If this were true, there would be a lot of IPv6-only end stations that would be useless right now.
Jeff L.