[Battlemesh] time sychronization in wibed

Dave Taht dave.taht at gmail.com
Sat Aug 8 14:16:03 CEST 2015

we went through hell making dnssec work without a rtc. I liked, in the
end, the solutions that landed in dnsmasq for bootstrapping dns, time,
and dnssec.

On Sat, Aug 8, 2015 at 4:47 AM, Benjamin Henrion <zoobab at gmail.com> wrote:
> On Sat, Aug 8, 2015 at 1:41 PM, Daniel Golle <daniel at makrotopia.org> wrote:
>> Dear testbed team,
>> I just stumbled into the fact that GNUnet needs at least roughly
>> synchronized time for things to work.
>> https://gnunet.org/bugs/view.php?id=3932
>> Obviously, running systems without an RTC in an isolated environment
>> will not provide that luxury to software running and the only lesson
>> I still remembered out of all the things I should have learned in the
>> Distributed Systems course I once visited is that one should never
>> rely on the "wall clock" aka. "planetary time" in distributed systems.
>> However, GNUnet partially violates that rule and doesn't provide any
>> internal means to synchronize clocks (yet).
>> Thus it would be nice to have at least rdate or NTP on all nodes on
>> the testbed and use it to synchronize time using the management mesh
>> and touch a file inside the overlay which can then be used after reboot
>> to at least get a rough idea of absolute time from the atime/mtime of
>> that file which should be good enough for GNUnet to work.
>> Any ideas?
> That remembers me the debugging I spent on curvetun vpn to find out it
> does not work if the 2 nodes are not in sync:
> https://github.com/netsniff-ng/netsniff-ng/issues/141
> I think the crypto is very sensitive to time differences.
> You might need an external clock source, like a GPS receiver if you do
> not have network.
> --
> Benjamin Henrion <bhenrion at ffii.org>
> FFII Brussels - +32-484-566109 - +32-2-4148403
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Dave Täht
worldwide bufferbloat report:
What will it take to vastly improve wifi for everyone?

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