Strange sendmail behaviour after upgrade to 9.1-BETA2

[Pavel Timofeev]

So, sendmail is broken? Or libraries which sendmail uses to resolv names?

2013/8/5 Pavel Timofeev <timp87 at gmail.com>:
> Hmm. SERVFAIL comes because of not full dns name. Kalmar. instead of
> kalmar.ocs.ru.
>
> 2013/8/5 Pavel Timofeev <timp87 at gmail.com>:
>> Got some new info. I read this
>> https://lists.isc.org/pipermail/bind-users/2006-August/063528.html
>> Perhaps, the problem because our MS DNS server returns SERVFAIL on AAAA query.
>> It happens in case of often AAAA queries. It's 9.2-RC1:
>> ....
>> 14:59:50.973445 IP reticulum.xxx.ru.29244 > hercules.xxx.ru.domain:
>> 53419+ MX? xxx.ru. (24)
>> 14:59:50.973754 IP hercules.xxx.ru.domain > reticulum.xxx.ru.29244:
>> 53419* 1/0/1 MX kalmar.xxx.ru. 10 (63)
>> 14:59:50.974061 IP reticulum.xxx.ru.56461 > hercules.xxx.ru.domain:
>> 53420+ AAAA? kalmar.xxx.ru. (31)
>> 14:59:50.974340 IP hercules.xxx.ru.domain > reticulum.xxx.ru.56461:
>> 53420* 0/1/0 (82)
>> 14:59:50.974570 IP reticulum.xxx.ru.28332 > hercules.xxx.ru.domain:
>> 53421+ AAAA? kalmar.xxx.ru. (31)
>> 14:59:50.974887 IP hercules.xxx.ru.domain > reticulum.xxx.ru.28332:
>> 53421* 0/1/0 (82)
>> 14:59:50.974919 IP reticulum.xxx.ru.21453 > hercules.xxx.ru.domain:
>> 53422+ AAAA? kalmar. (24)
>> 14:59:50.975290 IP hercules.xxx.ru.domain > reticulum.xxx.ru.21453:
>> 53422 ServFail 0/0/0 (24)
>> ....
>> At third time MS DNS returned SERVFAIL. Why sendmail asks AAAA for 3 times?
>> Something wrong with bind libraries? I think if there was no SERVFAIL
>> on AAAA it would ask for A record then.
>>
>> The opposite situation on 9.1-RELEASE. Here sendmail asks AAAA only
>> for 1 time. Then it asks A.
>> ...
>> 14:30:45.061950 IP 10.0.2.15.30979 > hercules.xxx.ru.domain: 62684+
>> MX? xxx.ru. (24)
>> 14:30:45.063064 IP hercules.xxx.ru.domain > 10.0.2.15.30979: 62684*
>> 1/0/1 MX kalmar.xxx.ru. 10 (63)
>> 14:30:45.063624 IP 10.0.2.15.39212 > hercules.xxx.ru.domain: 62685+
>> AAAA? kalmar.xxx.ru. (31)
>> 14:30:45.064460 IP hercules.xxx.ru.domain > 10.0.2.15.39212: 62685* 0/1/0 (82)
>> 14:30:45.064766 IP 10.0.2.15.44381 > hercules.xxx.ru.domain: 62686+ A?
>> kalmar.xxx.ru. (31)
>> 14:30:45.065530 IP hercules.xxx.ru.domain > 10.0.2.15.44381: 62686*
>> 1/0/0 A 192.168.31.190 (47)
>> ...
>>
>> I will continue investigation.
>>
>>
>>
>> 2013/8/4 Pavel Timofeev <timp87 at gmail.com>:
>>> Same thing on RELENG/9.2
>>>
>>> 2013/8/3 Pavel Timofeev <timp87 at gmail.com>:
>>>> 2013/8/2 Ruben de Groot <mail25 at bzerk.org>:
>>>>> On Wed, Jul 31, 2013 at 04:54:08PM +0400, Pavel Timofeev typed:
>>>>>> I've just installed new fresh 9.2-BETA2 amd64 on another machine.
>>>>>> Same behaviour - Sendmail asks DNS only for AAAA record of mx server.
>>>>>> We don't use IPv6 in our company.
>>>>>>
>>>>>> 2013/7/31 Pavel Timofeev <timp87 at gmail.com>:
>>>>>> > I wanted to say that sendmail asks only AAAA (IPv6) record of mx
>>>>>> > server, but not A (IPv4).
>>>>>> > Any ideas?
>>>>>> >
>>>>>> > 2013/7/31 Pavel Timofeev <timp87 at gmail.com>:
>>>>>> >> Looks like my sendmail uses only IPv6 to resolve mx server dns name to
>>>>>> >> ip address.
>>>>>> >>
>>>>>> >> 14:59:50.793338 IP reticulum.xxx.ru.19032 > hercules.xxx.ru.domain:
>>>>>> >> 53417+ AAAA? xxx.ru. (24)
>>>>>> >>                                                    [13/98]
>>>>>> >> 14:59:50.793662 IP hercules.xxx.ru.domain > reticulum.xxx.ru.19032:
>>>>>> >> 53417* 0/1/0 (75)
>>>>>> >> 14:59:50.793696 IP reticulum.xxx.ru.55299 > hercules.xxx.ru.domain:
>>>>>> >> 53418+ A? xxx.ru. (24)
>>>>>
>>>>> Here it is definately asking an A record.
>>>>
>>>> And? It's not A record of mx server.
>>>>
>>>>>> >> 14:59:50.794087 IP hercules.xxx.ru.domain > reticulum.xxx.ru.55299:
>>>>>> >> 53418* 7/0/0 A 192.168.2.11, A 192.168.2.12, A 192.168.41.4, A
>>>>>> >> 192.168.14.12, A 192.168.34.100, A 192.168.34.110, A 192.168.44.19
>>>>>> >>  (136)
>>>>>
>>>>> And here is the reply. The quetion is more why is it repeating the same
>>>>> query (below) over and over.
>>>>
>>>> Yes, reply about xxx.ru, not about mx server's IP which is kalmar.xxx.ru
>>>>
>>>>>
>>>>> Ruben
>>>>>
>>>>>> >> 14:59:50.973445 IP reticulum.xxx.ru.29244 > hercules.xxx.ru.domain:
>>>>>> >> 53419+ MX? xxx.ru. (24)
>>>>>> >> 14:59:50.973754 IP hercules.xxx.ru.domain > reticulum.xxx.ru.29244:
>>>>>> >> 53419* 1/0/1 MX kalmar.xxx.ru. 10 (63)
>>>>>> >> 14:59:50.974061 IP reticulum.xxx.ru.56461 > hercules.xxx.ru.domain:
>>>>>> >> 53420+ AAAA? kalmar.xxx.ru. (31)
>>>>>> >> 14:59:50.974340 IP hercules.xxx.ru.domain > reticulum.xxx.ru.56461:
>>>>>> >> 53420* 0/1/0 (82)
>>>>>> >> 14:59:50.974570 IP reticulum.xxx.ru.28332 > hercules.xxx.ru.domain:
>>>>>> >> 53421+ AAAA? kalmar.xxx.ru. (31)
>>>>>> >> 14:59:50.974887 IP hercules.xxx.ru.domain > reticulum.xxx.ru.28332:
>>>>>> >> 53421* 0/1/0 (82)
>>>>>> >> 14:59:50.974919 IP reticulum.xxx.ru.21453 > hercules.xxx.ru.domain:
>>>>>> >> 53422+ AAAA? kalmar. (24)
>>>>>> >> 14:59:50.975290 IP hercules.xxx.ru.domain > reticulum.xxx.ru.21453:
>>>>>> >> 53422 ServFail 0/0/0 (24)
>>>>>> >> 14:59:50.975314 IP reticulum.xxx.ru.63038 > hercules.xxx.ru.domain:
>>>>>> >> 53422+ AAAA? kalmar. (24)
>>>>>> >> 14:59:50.975674 IP hercules.xxx.ru.domain > reticulum.xxx.ru.63038:
>>>>>> >> 53422 ServFail 0/0/0 (24)
>>>>>> >> 14:59:50.975749 IP reticulum.xxx.ru.38393 > hercules.xxx.ru.domain:
>>>>>> >> 53423+ AAAA? kalmar.xxx.ru. (31)
>>>>>> >> 14:59:50.976105 IP hercules.xxx.ru.domain > reticulum.xxx.ru.38393:
>>>>>> >> 53423* 0/1/0 (82)
>>>>>> >> 14:59:50.976176 IP reticulum.xxx.ru.45558 > hercules.xxx.ru.domain:
>>>>>> >> 53424+ AAAA? kalmar. (24)
>>>>>> >> 14:59:50.976483 IP hercules.xxx.ru.domain > reticulum.xxx.ru.45558:
>>>>>> >> 53424 ServFail 0/0/0 (24)
>>>>>> >> 14:59:50.976512 IP reticulum.xxx.ru.45297 > hercules.xxx.ru.domain:
>>>>>> >> 53424+ AAAA? kalmar. (24)
>>>>>> >> 14:59:50.976864 IP hercules.xxx.ru.domain > reticulum.xxx.ru.45297:
>>>>>> >> 53424 ServFail 0/0/0 (24)
>>>>>> >>
>>>>>> >> How to force it to use IPv4?
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