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Hi Terry, Matt is on holiday (which is why nodes have broken). Whilst I am able to do as you ask, I have no idea how to as networking is not somethign I understand, so I will need some commands to fire off. Robin. On 18/09/18 11:30, Terry Froy wrote: > > Hi Matt, > > > Could you perform a packet capture between one of your DHCPv6 clients > and your DHCPv6 server ? (either on the client or on the server) > > It would also be useful to capture and/or provide configuration for > your upstream router which provides the router advertisements to your > subnet. > > Quite happy to provide some sample tcpdump parameters so you can run > these captures if you need them... > > Regards, > Terry > -- > Terry Froy > Cluster Systems Manager, Particle Physics > Queen Mary University of London > Tel: +44 (0)207 882 6560 > E-mail: [log in to unmask] <mailto:[log in to unmask]> > > ------------------------------------------------------------------------ > *From:* Testbed Support for GridPP member institutes > <[log in to unmask]> on behalf of Doidge, Matt > <[log in to unmask]> > *Sent:* 18 September 2018 02:06:39 > *To:* [log in to unmask] > *Subject:* CentOS7 Nodes not getting v6 addresses > 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? > ######################################################################## > > To unsubscribe from the TB-SUPPORT list, click the following link: > https://www.jiscmail.ac.uk/cgi-bin/webadmin?SUBED1=TB-SUPPORT&A=1 > > ------------------------------------------------------------------------ > > To unsubscribe from the TB-SUPPORT list, click the following link: > https://www.jiscmail.ac.uk/cgi-bin/webadmin?SUBED1=TB-SUPPORT&A=1 > ######################################################################## To unsubscribe from the TB-SUPPORT list, click the following link: https://www.jiscmail.ac.uk/cgi-bin/webadmin?SUBED1=TB-SUPPORT&A=1