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X-MS-Exchange-CrossPremises-SCL: 1 X-MS-Exchange-CrossPremises-Processed-By-Journaling: Journal Agent X-OrganizationHeadersPreserved: DU7PPF9242261ED.EURP192.PROD.OUTLOOK.COM X-Proofpoint-GUID: w81ghZupTo3XmYapYOaHlP5v2wgrBvOe X-Proofpoint-ORIG-GUID: w81ghZupTo3XmYapYOaHlP5v2wgrBvOe X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMjEzMDA1MyBTYWx0ZWRfX9C6bnn5pM+6s Jqswyrwq1c96OnavYLiigZFXxdd8MY26RlP11WykfIFehr3r+qmtcH31VhHE/vDafw8XKLM37AZ wUBZVu8U+pINEMzDMrAROnNbaEn+Bc6PhnNm9FA0f1EKRnlNtYT/0KwqFoyhTGl7u74/yPZHePn STfqGnZtXp22Xi5DzcbcVVbn61AJgj/71g6gP9V/jXS3qbj3lTTgkDhOWNWa83/5jFgF7QXMb8q kUtwD+qcWKy0QlU/G+RHnefzG/NEL43lFis6+BI/Dk359UVbhzFvJ6o9l9QmRZw/FcCXwfBbpCw HT71FOovJQ0TEtialEog1SQX3mcOfnFnXcCuxV3Id5YnWjWvdfYZgvFNJuHLQx3shNQ/HS4OVYf BF/Nt/SiId4xtkT5Sx3wCricmnOeDG9PyfHlxXBik63+4PGWSEQS9yWz/eVsTuqfl2n8iH5NX6u nwqvrcaUpsO/frO2tLg== X-Authority-Analysis: v=2.4 cv=J+inLQnS c=1 sm=1 tr=0 ts=698ecd35 cx=c_pps a=oadGwveH4K/rHZ7pqere9g==:117 a=6eWqkTHjU83fiwn7nKZWdM+Sl24=:19 a=z/mQ4Ysz8XfWz/Q5cLBRGdckG28=:19 a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=xqWC_Br6kY4A:10 a=IkcTkHD0fZMA:10 a=HzLeVaNsDn8A:10 a=8gLI3H-aZtYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=Mpw57Om8IfrbqaoTuvik:22 a=GgsMoib0sEa3-_RKJdDe:22 a=RxTbA9-1CU_5KBPb2R8A:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 Hello wireless devs, I am analyzing a wireless management frame taken from the beacon of an access point, and in this frame the `20/40 Coexistence Management Support` bit is set to 0, indicating that the feature is not supported. See frame below: Frame 2: 217 bytes on wire (1736 bits), 217 bytes captured (1736 bits) Radiotap Header v0, Length 26 802.11 radio information IEEE 802.11 Beacon frame, Flags: ........ IEEE 802.11 Wireless Management Fixed parameters (12 bytes) Tagged parameters (155 bytes) Tag: SSID parameter set: "SSID" Tag: Supported Rates 6(B), 9, 12(B), 18, 24(B), 36, 48, 54, [Mbit/sec] Tag: DS Parameter set: Current Channel: 6 Tag: Traffic Indication Map (TIM): DTIM 0 of 2 bitmap Tag: Country Information: Country Code DE, Environment All Tag: ERP Information Tag: QBSS Load Element 802.11e CCA Version Tag: Supported Operating Classes Tag: HT Capabilities (802.11n D1.10) Tag: HT Information (802.11n D1.10) Tag: Extended Capabilities (10 octets) Tag Number: Extended Capabilities (127) Tag length: 10 Extended Capabilities: 0x04 (octet 1) .... ...0 = 20/40 BSS Coexistence Management Support: Not supported .... ..0. = General Link (GLK): 0x0 .... .1.. = Extended Channel Switching: Supported .... 0... = GLK-GCR: 0x0 ...0 .... = PSMP Capability: Not supported ..0. .... = Reserved: 0x0 .0.. .... = S-PSMP Support: Not supported 0... .... = Event: Not supported Extended Capabilities: 0x00 (octet 2) Extended Capabilities: 0x00 (octet 3) Extended Capabilities: 0x02 (octet 4) Extended Capabilities: 0x00 (octet 5) Extended Capabilities: 0x00 (octet 6) Extended Capabilities: 0x01 (octet 7) Extended Capabilities: 0x0040 (octets 8 & 9) Extended Capabilities: 0x40 (octet 10) Tag: Vendor Specific: Microsoft Corp.: WMM/WME: Parameter Element I reviewed several driver implementations, and none of them seem to advertise this capability. I also could not find any definition for this bit in `include/linux/ieee80211.h`, unlike many other capability bits that are defined (e.g. `WLAN_EXT_CAPA1_EXT_CHANNEL_SWITCHING` or `WLAN_EXT_CAPA3_MULTI_BSSID_SUPPORT`). From what I can see, none of the `mac80211`‑based drivers appear to support this feature, is that correct? Additionally, I want to confirm whether my understanding of the feature is accurate: the 20/40 Coexistence mechanism implements the “good neighbor” policy, meaning that an AP using a 40 MHz channel in the 2.4 GHz band must fall back to 20 MHz when it detects an overlapping BSS (OBSS). Is that right? Any clarification would be greatly appreciated. Best regards Alexander Wilhelm