Re: Rescanning Network

[Dan Williams <dcbw redhat com>]

On Mon, 2006-02-13 at 21:52 -0500, Matthew Tippett wrote:
> Hi.
> 
> I am trying to work out how to force a rescan of available networks with 
> NetworkManager.
> 
> NetworkManager scans and locates access points quite happily, but if I 
> change locations without a restart, I can't seem to force a rescan to 
> locate the new network.
> 
> Is there any user accessable way to force a rescan?  'iwlist scan' 
> reports the networks correctly.
> 
> I am using NetworkManager 0.5.1 on Ubuntu Dapper.

Hmm... NM uses a composite scan algorithm, which aggregates the results
of the past 3 or so scans.  These scans could be anywhere from 20s to 2
minutes apart.  When an access point hasn't been in one of the scans for
about 5 mintues, its purged from the list.

So, if the following is the case, then there's a bug:  if you put the
laptop in a car, drive somewhere, take it out, and it still lists the
same networks more than 5 minutes later.

However, as noted above, it does take some time for APs to time out.
How long are you waiting?

Dan