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Full Discussion: DNS Server with IPv6 support
Special Forums IP Networking DNS Server with IPv6 support Post 302123633 by skanatiker on Tuesday 26th of June 2007 09:30:34 AM
Old 06-26-2007
DNS Server with IPv6 support
Hello,

i have a problem with a dns server. It is running bind 9.4.1 (compiled with "-enable-ipv6") on an AIX 5.3 system. The server starts without any errors or warnings. I am also able to lookup names for IPv4 adresses. But with IPv6 i have a strange problem.

When i execute the following dig command everything looks fine:

dig -t AAAA @localhost host1.v6mainzlab.com:
Code:
; <<>> DiG 9.2.0 <<>> -t AAAA @localhost host1.v6mainzlab.com
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 63726
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 1

;; QUESTION SECTION:
;host1.v6mainzlab.com.          IN      AAAA

;; ANSWER SECTION:
host1.v6mainzlab.com.   86400   IN      AAAA    2007::239

;; AUTHORITY SECTION:
v6mainzlab.com.         86400   IN      NS      ns.v6mainzlab.com.

;; ADDITIONAL SECTION:
ns.v6mainzlab.com.      86400   IN      AAAA    2007::239

;; Query time: 23 msec
;; SERVER: 127.0.0.1#53(localhost)
;; WHEN: Tue Jun 26 15:06:10 2007
;; MSG SIZE  rcvd: 111

But when i use ::1 instead of localhost i get the following output:

dig -t AAAA @::1 host1.v6mainzlab.com:

Code:
; <<>> DiG 9.2.0 <<>> -t AAAA @::1 host1.v6mainzlab.com
;; global options:  printcmd
;; connection timed out; no servers could be reached

Ok, it seems as if the server does not listen to IPv6 request. But when i force dig to use TCP instead of UDP everything looks good:

dig -t AAAA +vc @::1 host1.v6mainzlab.com:

Code:
; <<>> DiG 9.2.0 <<>> -t AAAA +vc @::1 host1.v6mainzlab.com
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 58888
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 1

;; QUESTION SECTION:
;host1.v6mainzlab.com.          IN      AAAA

;; ANSWER SECTION:
host1.v6mainzlab.com.   86400   IN      AAAA    2007::239

;; AUTHORITY SECTION:
v6mainzlab.com.         86400   IN      NS      ns.v6mainzlab.com.

;; ADDITIONAL SECTION:
ns.v6mainzlab.com.      86400   IN      AAAA    2007::239

;; Query time: 2 msec
;; SERVER: ::1#53(::1)
;; WHEN: Tue Jun 26 15:09:36 2007
;; MSG SIZE  rcvd: 111

The DNS server seems to be listening on TCP as well as UDP when i execute

netstat -ant | grep "\.53":

Code:
tcp6       0      0  *.53                   *.*                    LISTEN
tcp4       0      0  127.0.0.1.53           *.*                    LISTEN
tcp4       0      0  5.55.55.239.53        *.*                    LISTEN
udp4       0      0  127.0.0.1.53           *.*
udp4       0      0  5.55.55.239.53        *.*
udp6    4142      0  *.53                   *.*

I hope someone can help me. Why does it work via TCP, but not via UDP? Any Ideas?
 

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