Gmail MX over IPv6
jkrolan at mnathani.com
Thu Jun 21 09:51:05 CEST 2012
After turning off Router Advertisements from a cisco device on the network,
I get the expected Network is unreachable message when the MTA tries IPv6
and right after that the message goes through using v4.
Thank you for your assistance.
Jun 21 03:41:48 onion postfix/qmgr: 3CCDA1A1123: from=<
root at example.com>, size=452, nrcpt=1 (queue active)
Jun 21 03:41:48 onion postfix/smtp: connect to
gmail-smtp-in-v4v6.l.google.com[2001:4860:b007::1a]:25: Network is
Jun 21 03:41:50 onion postfix/smtp: 3CCDA1A1123: to=<
myaddress at gmail.com>, relay=gmail-smtp-in-v4v6.l.google.com[18.104.22.168]:25,
delay=1.9, delays=0.21/0.02/0.86/0.84, dsn=2.0.0, status=sent (250 2.0.0 OK
Jun 21 03:41:50 onion postfix/qmgr: 3CCDA1A1123: removed
On Thu, Jun 21, 2012 at 3:32 AM, Bernhard Schmidt <berni at birkenwald.de>wrote:
> Am 21.06.2012 09:28, schrieb Mansoor Nathani:
> > I noticed it seems to be picking up some ip / address info from an IPv6
> > tunnel to Hurricane Electric.
> > I never configured this host with any such IPv6 information however.
> > The tunnel is using 2001:470:b148::/48 .
> Well, someone in your network obviously did.
> > 2001:470:b148::/48 dev eth0 proto kernel metric 256 expires 0sec mtu
> > default via fe80::205:32ff:fee8:8b61 dev eth0 proto kernel metric 1024
> > expires 0sec mtu 1500 advmss 1440 hoplimit 64
> The device with the MAC address 00:05:32:e8:8b:61 is sending router
> advertisements with the prefix 2001:470:b148::/48 . Lucky (or unlucky)
> for you they are wrongly advertising a /48, not a /64, so SLAAC does not
> work and you don't get an address assigned. I'm a bit confused at the
> moment, since I thought Linux was handling "has defaultroute but not a
> global address" correctly these days, but obviously there are still some
> Hunt down that bogus advertisement, that should solve the problem.
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