[Battlemesh] time sychronization in wibed

[Dave Taht]

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
> "In July 2005, after several failed attempts to legalise software
> patents in Europe, the patent establishment changed its strategy.
> Instead of explicitly seeking to sanction the patentability of
> software, they are now seeking to create a central European patent
> court, which would establish and enforce patentability rules in their
> favor, without any possibility of correction by competing courts or
> democratically elected legislators."
> _______________________________________________
> Battlemesh mailing list
> Battlemesh at ml.ninux.org
> http://ml.ninux.org/mailman/listinfo/battlemesh



-- 
Dave Täht
worldwide bufferbloat report:
http://www.dslreports.com/speedtest/results/bufferbloat
And:
What will it take to vastly improve wifi for everyone?
https://plus.google.com/u/0/explore/makewififast