HOSTAPD设置ht_capab为HT40，强制为40MHz

最新推荐文章于 2025-06-06 09:47:05 发布

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最新推荐文章于 2025-06-06 09:47:05 发布 · 1.2w 阅读

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本文介绍了如何设置HOSTAPD的ht_capab选项以启用HT40MHz，特别是在2.4G频段下针对不同信道的使用规则。当遇到无法达到40MHz的情况，可能是因为频段冲突导致hostapd自动降级到HT20MHz。在源码hostapd/src/ap/hw_features.c中找到相应判断并禁用，可以强制HOSTAPD保持在HT40MHz模式。

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首先看样例hostapd.conf文件中对ht_capab选项的描述

# ht_capab: HT capabilities (list of flags)
# LDPC coding capability: [LDPC] = supported
# Supported channel width set: [HT40-] = both 20 MHz and 40 MHz with secondary
#       channel below the primary channel; [HT40+] = both 20 MHz and 40 MHz
#       with secondary channel below the primary channel
#       (20 MHz only if neither is set)
#       Note: There are limits on which channels can be used with HT40- and
#       HT40+. Following table shows the channels that may be available for
#       HT40- and HT40+ use per IEEE 802.11n Annex J:
#       freq            HT40-           HT40+
#       2.4 GHz         5-13            1-7 (1-9 in Europe/Japan)
#       5 GHz           40,48,56,64     36,44,52,60
#       (depending on the location, not all of these channels may be available
#       for use)
#       Please note that 40 MHz channels may switch their primary and secondary
#       channels if needed or creation of 40 MH