[outages] odd gmail issue.. inet6 ?

[Mike Tancsa]

For the archives, I should have know this, but to get sendmail to spit
out a little more of the exchange, a -d17 would have done the trick.

eg  sendmail -q -qRdestuser at gmail.com -v -d17

	---Mike

On 12/21/2013 9:01 AM, Mike Tancsa wrote:
> Of course, 2 min after sending this the problem goes away and mail flows
> once again :(
> 
> 	---Mike
> 
> On 12/21/2013 8:56 AM, Mike Tancsa wrote:
>> I noticed on a couple of our mail servers, delivery to gmail was getting
>> stuck in the outbound queue.  Our MTAs are all sendmail
>>
>> If I hardcode delivery to gmail to 74.125.142.26 via a mailertable
>> entry, mail goes through fine
>>
>> But if let it naturally select the inet6 addr, it hangs
>>
>>
>> Running /var/spool/mqueue/rBLDcRmZ092661 (sequence 1 of 1)
>> <miketancsa at gmail.com>... Connecting to gmail-smtp-in.l.google.com. via
>> esmtp...
>> 220 mx.google.com ESMTP v3si9282987qat.181 - gsmtp
>>>>> EHLO smarthost2.sentex.ca
>> 250-mx.google.com at your service, [2607:f3e0:80:80::2]
>> 250-SIZE 35882577
>> 250-8BITMIME
>> 250-STARTTLS
>> 250-ENHANCEDSTATUSCODES
>> 250-PIPELINING
>> 250 CHUNKING
>>>>> STARTTLS
>> 220 2.0.0 Ready to start TLS
>>
>>
>> The addr is of course reachable. I check the routing and the AS seems
>> legit. The path is 6939 15169
>>
>> traceroute6 to 2607:f8b0:400d:c02::1a (2607:f8b0:400d:c02::1a) from
>> 2607:f3e0:80:80::2, 64 hops max, 12 byte packets
>>  1  2607:f3e0:80:80::1  0.585 ms
>>  2  toronto-torix-6  0.478 ms
>>  3  gw-he.ip6.torontointernetxchange.net  0.995 ms
>>  4  2001:478:245:1::6  1.104 ms
>>  5  2001:4860::1:0:28  1.684 ms
>>  6  2001:4860::8:0:4398  15.514 ms
>>  7  2001:4860::8:0:6375  21.308 ms
>>  8  2001:4860::8:0:5e9d  37.368 ms
>>  9  2001:4860::2:0:3568  28.932 ms
>> 10  *
>> 11  *
>> 12  *
>> 13  qe-in-x1a.1e100.net  28.663 ms
>>
>>
>> I am coming from 2607:f3e0:80:80::2 in the above case
>>
>> tcpdump doesnt show anything obvious and since the payload is not
>> readble I cant see it.  I wonder if there is a way to get sendmail to
>> print out the contents...
>>
> 
> 


-- 
-------------------
Mike Tancsa, tel +1 519 651 3400
Sentex Communications, mike at sentex.net
Providing Internet services since 1994 www.sentex.net
Cambridge, Ontario Canada   http://www.tancsa.com/