Hello all,
All our Dual-Stacked CentOS 7 boxes here at Lancaster have failed to renew their DHCPv6 leases over the weekend, so we're kind of dead in the water as our "state of the art" C7, v6 enabled SE has ground to a halt. It's also hurt our perfsonar boxes, and our bdii. But any box running SL6 is having no problems with it's v6 networking. It seems OS dependent. You can ping6 from the affected machines but you can't ping6 too them (they're not binding to their v6 address). Some packet sniffing seems to show the interfaces on these machines not getting any v6 DHCP ACKnowledgements.
I've dropped a mail to our central support guys asking if they've changed anything over the last week. But to get ahead of it our end I thought I'd approach the collective. Has anyone seen anything like this before?
To give a bit more information, Lancaster is running DHCPv6 rather then SLAAC, but I've never had any luck getting a C7 boxes v6 networking to work without disabling the Network manager. In fact when NetworkManager is enabled we saw exactly the same behaviour. This setup has worked for long enough that I would have thought we'd have seen any issues by now (we've had dual-stacked perfsonars for a good few months, dual-stacked C7 DPM for a month and dual-stacked C7 BDII for a fortnight).
Any help or advice, or any idea of where to start, would be greatly appreciated.
Thanks in advance,
Matt, wondering why things always break on a week off?
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