mcast_rate is used for multicast packets only. The multicast rate is always fixed and defaults to 1MBit/s. We recommend setting it to a higher value like 12MBit/s to reduce the airtime used by the background noise. This setting affects the mesh links only, not the clients links (as it is unknown if all clients work with multicast rates other than 1MBit/s).
The unicast rate is completely independent of this and is negotiated for each peer and client independently. It may be higher or lower than the multicast rate.
supported_rates and basic_rate control the allowed unicast rates for both mesh and client links. They are mainly useful to prevent the use of legacy 802.11b rates, which may impair the overall WLAN performance. Also, these settings don’t affect the „extended rates“ (802.11n, everything higher than 54MBit/s), these are always allowed additionally.
Aus dem ersten Absatz wird mir klar, dass der Mesh traffic einen Multicast Anteil hat, sodass sich das wohl lohnen wird, die mcast_rate zu erhöhen. Mehr aber auch nicht. Wenn Du @fuzzle damit sagen willst, dass der Anteil 100% ist, dann halten wir das mal so fest. Mir fehlt da aber auch noch etwas der Hintergrund.
Additionally it is possible to configure the supported_rates and basic_rate
of each radio. Both are optional, by default hostapd/driver dictate the rates.
If supported_rates is set, basic_rate is required, because basic_rate
has to be a subset of supported_rates.
The example below disables 802.11b rates.
ap requires a single parameter, a string, named ssid which sets the
interface’s ESSID.
mesh requires a single parameter, a string, named id which sets the mesh id.
ibss requires two parametersr: ssid (a string) and bssid (a MAC).
An optional parameter vlan (integer) is supported.
Both mesh and ibss accept an optional mcast_rate (kbit/s) parameter for
setting the default multicast datarate.
wifi24 = {
channel = 11,
supported_rates = {6000, 9000, 12000, 18000, 24000, 36000, 48000, 54000},
basic_rate = {6000, 9000, 18000, 36000, 54000},
ap = {
ssid = ‚entenhausen.freifunk.net‘,
},
mesh = {
id = ‚entenhausen-mesh‘,
mcast_rate = 12000,
},
ibss = {
ssid = ‚ff:ff:ff:ee:ba:be‘,
bssid = ‚ff:ff:ff:ee:ba:be‘,
mcast_rate = 12000,
},
},
The mcast_rate is only used for multicast traffic, which is management traffic (WLAN beacons, batman-adv OGMs) and multicast/broadcast payloads (ARP, ICMPv6, …). It is fixed as multicast packets are not directed to any specific recipient, but sent only once for all peers, so there is no negotiation.
Unicast packets are sent only to a single peer and are thus sent with higher or lower bitrate, which is negotiated with the peer individually
Mir fehlt da aber auch noch etwas der Hintergrund.