[LUNI] Fake Link Connection?

[Samir Faci]

Yeah, pretty much what Seva mentioned.  I was curious if anyone played
with a scenario similar to that for some reason.

Either ways, this is getting way OT.  Thanks for all your feedback.

--
Samir



On Fri, Jul 31, 2009 at 12:38 AM, Seva Epsteyn<seva at glivorem.com> wrote:
> If this is what I think he is talking about, the situation is the following.
>
> There is a physical switch that cuts the connection between the PC in
> the "lock up" and the network connection to the rest of the world.
> When certain time comes the PC as allowed to communicate with the rest
> of the world by someone flipping the physical switch.
>
> There are actually a few competing companies trying to get the same
> financial news information from the "lock up" to the outside in the
> automated trading world as fast as possible after the switch is
> flipped, so the milliseconds count.
>
> I was passively involved in some of the discussions regarding this,
> and the partial solution to this was to insert a hub on each side of
> the physical cut-off switch to keep the link state as up, there are
> all sorts of other issues related to this that are unrelated to Linux
> itself and are not being mentioned.
>
> Seva
>
> On Thu, Jul 30, 2009 at 18:01, Martin Maney<maney at two14.net> wrote:
>> On Thu, Jul 30, 2009 at 11:41:19AM -0500, Samir Faci wrote:
>>> laptop ------physical link     --------SS -------- switch --------cloud
>>>
>>> so basically the SS (special switch, named by yours truly for lack of a
>>> better name) is just an on off switch that's enabled at a particular time
>>> that allows the laptop to broadcast.  The time it takes for the laptop to
>>> realize it has a link before it can send is too long, (1-2 seconds), what
>>> we're trying to do is make the network card think it's always connected, so
>>> it'll skip the check for link, and just send data as soon as the SS is
>>> flipped.
>>
>> Sounds like pissing into the wind.  Why don't you just have a cron job
>> ifup/ifdown the interface?
>>
>> And, okay, I can't resist: what sort of crackbrained solution to what
>> is this?  :-)
>>
>> --
>> automation: replacing what works with something that almost works,
>> but which is faster and cheaper.  - attributed to Roger Needham
>>
>> --
>> Linux Users Of Northern Illinois (Chicago) - Technical Discussion
>> http://luni.org/mailman/listinfo/luni
>>
> --
> Linux Users Of Northern Illinois (Chicago) - Technical Discussion
> http://luni.org/mailman/listinfo/luni
>



-- 
--
Samir Faci
*insert title*
`fortune`