a *fast* check for whether another machine is on the local network?

[Dar Scott]

Just wondering.  A thought.

Why not try to open the db?  Perhaps in the background.  If you have an image indicating the db selected, it can have some sort of busy look before one is selected.  Or simply use the local db if the remote db is not available at the time of a save.  

If that works, use it.  If it fails, go to the fallback.  You can even keeping trying to open the db.

By the time the first save is needed, perhaps the decision as to what db to use is already done.

Dar


On Jun 14, 2013, at 8:03 AM, Dr. Hawkins wrote:

> On Thu, Jun 13, 2013 at 4:53 PM, Daryl Williams
> <daryl at synergetic-data.com> wrote:
>> If I am understanding correctly you might try using either the netstat or
>> route commands to find your default gateway, and if there is none then save
>> things to the local database.
> 
> doesn't give me the timeout issues again--if the laptop is opened in
> the new location, won't the old router still be on the list, and need
> to be checked?
> 
> 
>> The problem with this approach will be determining the right syntax to use
>> for the current platform your code is running on. Unfortunately the syntax
>> is a bit different from windows to os x to linux, but they will all report
>> on the routing tables, including the default router, at which point you just
>> need to parse the command output (again different from platform to platform)
>> an take the appropriate action. The output can be rather detailed and
>> verbose, but should not too hard to parse.
> 
> This isn't too big of a problem--I already have OS based switches
> lying around the code.  I guess I'll have to buy a windows machine for
> the first time in my life to do some testing of that code on, though .
> . .
> 
> After going through all of these, it sounds like the controlled
> timeout is the way to go--when this stack comes to the front, it does
> a check.  If it thinks it's not on the VPN already, it just continues
> to use the local cache db--unless it sees "something"? new telling it
> that the VPN is back, in which case it tries.  If it thinks it should
> be on VPN, it pings for good measure with the 1s/50ms timeout.  Hmm,
> this can be delayed until the first db write, too.   So the only time
> the user gets hit for the whole second is when he actually changes
> from VPN to no VPN (blocked, no internet, whatever).
> 
> Thank you to all.  I now know more things I never expected to learn :)
> 
> 
> -- 
> Dr. Richard E. Hawkins, Esq.
> (702) 508-8462
> 
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