[outages] odd gmail issue.. inet6 ?

[Mike Tancsa]

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/