There's another problem. The wireless extensions have a size limit for the scan results data. The buffer size is a u16, which means you're limited to 65535 bytes. The network manager buffer increase algorithm keeps doubling the buffer size, so you get 2k, 4k, 8k, 16k, 32k, 64k.. but 64k mod 2^16 == 0! Meaning you never actually get to try a full 64k buffer.
A workaround to this issue is to change the NM code to max out at 65535 instead of 65536 or "100000" (which is the current limit).. This is being a MAJOR problem to a bunch of us at the IETF because we can easily hear well over 100 APs most of the time. -derek Quoting Dan Williams <[EMAIL PROTECTED]>: > On Mon, 2008-03-10 at 23:40 -0400, Robert Moskowitz wrote: >> Ver 0.6.4 in Centos 5.1 >> >> I am seeing 17 SSIDs in the current list. But I am not seeing one that >> I expected to see. And some of the listed SSIDs are 'stale'; that is >> they were visible in the part of the hotel I was in a couple minutes >> ago, but not in this part. So I guess a second question is how do you >> force a scan to produce a current SSID list? > > You don't force a scan. NetworkManager will periodically scan with a > backoff algorithm; it will start at 20 seconds and back off to 2 > minutes. APs are kept in the scan list for a maximum of 6 minutes > before being culled. > > The problem is that wireless is hard, and sometimes cards/drivers miss > beacons. Often they will not report all the APs that are known to be > around at a given time. So NetworkManager takes a composite of the last > few scans as the scan list. > > 0.6.x also combines APs with the same SSID in the UI. 0.7 splits them > out at the NetworkManager layer, while the applet combines APs that are > similar based on more than just SSID (SSID, security settings, band, > channel). > >> Perhaps the question may be how many APs can be handled and then those >> are turned into the SSID list (when more than one AP per SSID is found >> as in the case of some of these SSIDs). > > Are any of the APs hidden? > > Dan > > _______________________________________________ > NetworkManager-list mailing list > [email protected] > http://mail.gnome.org/mailman/listinfo/networkmanager-list > -- Derek Atkins, SB '93 MIT EE, SM '95 MIT Media Laboratory Member, MIT Student Information Processing Board (SIPB) URL: http://web.mit.edu/warlord/ PP-ASEL-IA N1NWH [EMAIL PROTECTED] PGP key available _______________________________________________ NetworkManager-list mailing list [email protected] http://mail.gnome.org/mailman/listinfo/networkmanager-list
