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[Bug 208359] spurious AAAA DNS query hurts performance and is anti-social



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Summary: spurious AAAA DNS query hurts performance and is anti-social


https://bugzilla.redhat.com/show_bug.cgi?id=208359


russell coker com au changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|CLOSED                      |ASSIGNED
           Keywords|                            |Reopened
         Resolution|WONTFIX                     |
  Status Whiteboard| bzcl34nup                  |bzcl34nup
            Version|5                           |8




------- Additional Comments From russell coker com au  2008-05-06 20:53 EST -------
Below is the tcpdump output from using a machine named "test" (which has the 
name "TEST" in tcpdump output) using a machine named "DNSSERVER" for it's DNS.  
I send myself an email, it does two "AAAA" lookups for itself (doing two 
lookups is a bug in itself) and then an "AAAA" lookup for my machine 
nospam.coker.com.au.  At the bottom of this report there is the ifconfig 
output showing that the machine in question has no IPv6 addresses and 
therefore no possibility of ever sending mail via IPv6.  I can only wonder 
what it might do if it was to get a response to one of it's AAAA requests.

This is from exim-4.68-1.fc8.

10:48:25.789466 IP TEST.filenet-nch > DNSSERVER.domain: 65297+ AAAA? test. 
(22)
10:48:25.790795 IP DNSSERVER.domain > TEST.filenet-nch: 65297 NXDomain 0/1/0 
(97)
10:48:25.822382 IP TEST.filenet-nch > DNSSERVER.domain: 37395+ AAAA? test. 
(22)
10:48:25.823566 IP DNSSERVER.domain > TEST.filenet-nch: 37395 NXDomain 0/1/0 
(97)
10:48:25.827032 IP TEST.filenet-nch > DNSSERVER.domain: 36442+ MX? 
coker.com.au. (30)
10:48:25.828610 IP DNSSERVER.domain > TEST.filenet-nch: 36442 1/2/3 MX[|
domain]
10:48:25.829319 IP TEST.filenet-nch > DNSSERVER.domain: 64716+ AAAA? 
nospam.sws.net.au. (35)
10:48:25.830459 IP DNSSERVER.domain > TEST.filenet-nch: 64716 0/1/0 (79)
10:48:25.831066 IP TEST.filenet-nch > DNSSERVER.domain: 4689+ A? 
nospam.sws.net.au. (35)
10:48:25.832517 IP DNSSERVER.domain > TEST.filenet-nch: 4689 1/2/2 A 
61.95.69.195 (132)

eth0      Link encap:Ethernet  HWaddr 00:02:A5:DE:52:B6
          inet addr:192.168.0.100  Bcast:192.168.0.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:386 errors:0 dropped:0 overruns:0 frame:0
          TX packets:312 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:37928 (37.0 KiB)  TX bytes:39671 (38.7 KiB)

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:1435 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1435 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:3445452 (3.2 MiB)  TX bytes:3445452 (3.2 MiB)


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