dmesg日志消息含义

Question

当我运行dmesg时，我需要理解以下消息的含义，以便研究为什么某个AP在与我的笔记本电脑具体连接时遇到问题。

这是我收到的一些我觉得可疑的信息，我需要理解

Limiting TX power to 20 (20 - 0) dBm as advertised x
deauthenticating from x by local choice (reason=3)
deauthenticating from x by local choice (reason=2)

使用完整日志进行更新

[10421.804625] wlan1: authenticate with xx:xx:xx:xx:xx:xx
[10421.808067] wlan1: send auth to xx:xx:xx:xx:xx:xx (try 1/3)
[10421.832374] wlan1: send auth to xx:xx:xx:xx:xx:xx (try 2/3)
[10421.834345] wlan1: authenticated
[10421.836063] wlan1: associate with xx:xx:xx:xx:xx:xx (try 1/3)
[10421.873549] wlan1: associate with xx:xx:xx:xx:xx:xx (try 2/3)
[10421.878351] wlan1: RX AssocResp from xx:xx:xx:xx:xx:xx (capab=0x431 status=0 aid=3)
[10421.884235] wlan1: associated
[10421.884384] cfg80211: Calling CRDA for country: EG
[10421.890886] cfg80211: Regulatory domain changed to country: EG
[10421.890896] cfg80211:   (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
[10421.890901] cfg80211:   (2402000 KHz - 2482000 KHz @ 40000 KHz), (N/A, 2000 mBm)
[10421.890906] cfg80211:   (5170000 KHz - 5250000 KHz @ 20000 KHz), (N/A, 2000 mBm)
[10421.890910] cfg80211:   (5250000 KHz - 5330000 KHz @ 20000 KHz), (N/A, 2000 mBm)
[10505.540819] wlan1: deauthenticated from xx:xx:xx:xx:xx:xx (Reason: 3)
[10505.571989] cfg80211: Calling CRDA to update world regulatory domain
[10505.577928] cfg80211: World regulatory domain updated:
[10505.577933] cfg80211:   (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
[10505.577936] cfg80211:   (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[10505.577938] cfg80211:   (2457000 KHz - 2482000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[10505.577940] cfg80211:   (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)
[10505.577943] cfg80211:   (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[10505.577945] cfg80211:   (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[10508.712246] wlan1: authenticate with xx:xx:xx:xx:xx:xx
[10508.715881] wlan1: send auth to xx:xx:xx:xx:xx:xx (try 1/3)
[10508.740321] wlan1: send auth to xx:xx:xx:xx:xx:xx (try 2/3)
[10508.742317] wlan1: authenticated
[10508.743270] wlan1: associate with xx:xx:xx:xx:xx:xx (try 1/3)
[10508.783452] wlan1: associate with xx:xx:xx:xx:xx:xx (try 2/3)
[10508.787617] wlan1: RX AssocResp from xx:xx:xx:xx:xx:xx (capab=0x431 status=0 aid=3)
[10508.793260] wlan1: associated
[10508.793434] cfg80211: Calling CRDA for country: EG
[10508.800528] cfg80211: Regulatory domain changed to country: EG
[10508.800537] cfg80211:   (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
[10508.800542] cfg80211:   (2402000 KHz - 2482000 KHz @ 40000 KHz), (N/A, 2000 mBm)
[10508.800547] cfg80211:   (5170000 KHz - 5250000 KHz @ 20000 KHz), (N/A, 2000 mBm)
[10508.800551] cfg80211:   (5250000 KHz - 5330000 KHz @ 20000 KHz), (N/A, 2000 mBm)

Answer 1

内核消息“将TX功率限制为%d (%d - %d) dBm，如.来自net/mac80211/mlme.c中的ieee80211_handle_pwr_constr()。关于限制TX权力的决定的评论指出：

“如果我们同时拥有802.11h和Cisco DTPC，则通过选择所宣传的两种功率级别中最小的一种来应用这两种限制。”

DTPC是一种动态机制，其中无线接入点可以指示无线客户端改变其无线电发射功率设置，使其在客户机从AP操作的距离上是最优的。DTPC的优点是将客户端调整到AP功率电平，同时减少无线客户端产生的共信道干扰量。

“从.通过本地选择进行身份验证”消息也来自ieee80211_mgd_deauth()的相同源代码。

原因代码2: WLAN_REASON_PREV_AUTH_NOT_VALID

原因代码3: WLAN_REASON_DEAUTH_LEAVING

我不太清楚这对你来说意味着什么。客户端似乎已经被DTPC降低了它的权限，然后进行了身份验证，这可能是您与AP的关联不能可靠工作的原因。

在您的接入点中禁用DTPC可能会有所帮助。