[Bug 208359] spurious AAAA DNS query hurts performance and is anti-social
bugzilla at redhat.com
bugzilla at redhat.com
Wed May 7 00:53:55 UTC 2008
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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 at 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 at 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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