Date: Thu, 28 Jun 2007 21:35:42 -0700 From: Sam Leffler <sam@errno.com> To: Kevin Gerry <sfpoof@gmail.com> Cc: freebsd-current@freebsd.org Subject: Re: Wireless NICs not obeying 'SSID' setting. Message-ID: <46848C1E.2080404@errno.com> In-Reply-To: <468488B3.7010607@errno.com> References: <c027a39a0706282053i4b9cbdd8j421710d950cfd9ea@mail.gmail.com> <468488B3.7010607@errno.com>
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Sam Leffler wrote: > Kevin Gerry wrote: >> I've noticed that in a recent patch that when you set a NIC with ifconfig >> ath0 ssid "This One" that it won't always honor that and jump on the >> strongest one. >> >> Example: >> >> 3 WAPs: SSIDs WAP1, WAP2, WAP3 >> >> I have set ath0's ssid to "WAP2" and ral0's ssid to "WAP3". They both will >> honor the ssid setting for the first connection. However, after a few >> hours/etc the drivers both associate with WAP1. >> >> The settings to require the specific SSID are in >> /etc/start_if.ral0/start_if.ath0. There aren't any conflicting >> directives to >> force it to go blank and select a random AP. > > You're probably roaming. wlandebug roam will verify what's going on. > You can disable roaming several ways: > > ifconfig ral0 roaming device > > should do the trick (if you set it to manual then you won't do what you > want if your beacon is turned off). Alternatively you can do > > ifconfig ral0 -bgscan > > as roaming won't take place w/o bg scanning. If you are roaming you can also just fiddle with the roaming thresholds; e.g. roam:rssi11g and roam:rate11g. I haven't updated the man page for ifconfig for these yet; they are threshold settings that when crossed cause the system to consider roaming to a different ap. The handling of ssid changed when roaming went in; it's now a "desired ssid". That is, if the scan doesn't see an ap with the desired ssid then it'll associate to another ap if possible. Should the ap w/ the desired ssid re-appear and roaming is enabled then you'll switch over to it. There is also hysteresis to this algorithm so you don't just bounce around from one ap to another. Sam
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