我们使用以下 1Gbit/s 无线链路设置：位置 A：
- 带有 1Gbits/s 对称光纤的互联网网关
- 我们的大部分服务器包括 dhcp、dns、文件服务器 (smb)、voip 服务器、exchange 服务器
- 55 个客户/用户
- 定向无线电中继 A (Lightpointe AireLink 60 SX) - 1Gbits/s
地点 B：
- 一个文件服务器 (smb)
- 30 个客户/用户
- 定向无线电中继 B (Lightpointe AireLink 60 SX) - 1Gbits/s
位置 A 和 B 之间的距离为 177 米。两个位置共享一个子网：客户端和服务器使用 192.168.0.0/24，VoIP 电话位于子网 10.6.3.0/24（两个位置也共享）。因此，两个位置之间没有路由，无线电链路充当桥梁。
定向无线电中继A的设置：
Link Status: UP
Mode: Data
RSSI, dBm: -46
RSSI Alarm Thrshld, dBm: -60
RSSI Alarm Clear, dBm: -50
RF Link: high
TX RF Band, GHz: 62.5
RX RF Band, GHz: 59.5
TX Power, dBm: -7
Distance: Very short
ACM: Enabled
Modulation: 16QAM 5/8
TX Lock: normal lock
RX Lock: normal lock
Modem Lock: locked
定向无线电中继B的设置：
Link Status: UP
Mode: Data
RSSI, dBm: -49
RSSI Alarm Thrshld, dBm: -60
RSSI Alarm Clear, dBm: -50
RF Link: low
TX RF Band, GHz: 59.5
RX RF Band, GHz: 62.5
TX Power, dBm: -4
Distance: Very short
ACM: Enabled
Modulation: 16QAM 5/8
TX Lock: normal lock
RX Lock: normal lock
Modem Lock: locked
RF 链路 RX 错误定向无线电中继 A: 0 RF 链路 RX 错误定向无线电中继 B: 0
我们在位置 B 遇到以下问题：
- VoIP 音频中断（大多数情况下每次只朝一个方向中断，每次持续约 3 秒）
- smb 吞吐量有时会下降到 5 Mbit/s 甚至更低
- 发送邮件（Exchange 服务器）有时非常慢
- 互联网连接速度慢
文件传输速率降至零并且文件传输因 0x8007003B （位置 A->B）而中止：
把它们加起来：似乎有什么东西导致了吞吐量的大幅下降，但我们不知道这里发生了什么。我们安装了两个“中间人”服务器，每个服务器都有两个桥接以太网端口，用于在无线电链路数据端口和将其连接到本地网络的交换机端口之间的两个位置收集一些ntopng数据tshark。
从位置 A 的客户端访问位置 A 的服务器以及从位置 B 的客户端访问位置 B 的服务器都没有问题。
- 服务器.位置-a = 192.168.0.149
- 服务器.位置-b = 192.168.0.242
iperf 显示良好的数据速率：
user@location-a:~$ iperf -c server.location-b -i 2 -t 20
------------------------------------------------------------
Client connecting to server.location-b, TCP port 5001
TCP window size: 512 KByte (default)
------------------------------------------------------------
[ 3] local 192.168.0.149 port 63378 connected with 192.168.0.242 port 5001
[ ID] Interval Transfer Bandwidth
[ 3] 0.0- 2.0 sec 198 MBytes 832 Mbits/sec
[ 3] 2.0- 4.0 sec 195 MBytes 817 Mbits/sec
[ 3] 4.0- 6.0 sec 198 MBytes 831 Mbits/sec
[ 3] 6.0- 8.0 sec 199 MBytes 836 Mbits/sec
[ 3] 8.0-10.0 sec 165 MBytes 692 Mbits/sec
[ 3] 10.0-12.0 sec 198 MBytes 829 Mbits/sec
[ 3] 12.0-14.0 sec 195 MBytes 817 Mbits/sec
[ 3] 14.0-16.0 sec 193 MBytes 810 Mbits/sec
[ 3] 16.0-18.0 sec 200 MBytes 838 Mbits/sec
[ 3] 18.0-20.0 sec 199 MBytes 833 Mbits/sec
[ 3] 0.0-20.0 sec 1.89 GBytes 814 Mbits/sec
两个方向均使用 --tradeoff (-r)
user@location-a:~$ iperf -c server.location-b -i 2 -t 20 -r
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 1.00 MByte (default)
------------------------------------------------------------
------------------------------------------------------------
Client connecting to server.location-b, TCP port 5001
TCP window size: 512 KByte (default)
------------------------------------------------------------
[ 4] local 192.168.0.149 port 49535 connected with 192.168.0.242 port 5001
[ ID] Interval Transfer Bandwidth
[ 4] 0.0- 2.0 sec 191 MBytes 801 Mbits/sec
[ 4] 2.0- 4.0 sec 196 MBytes 824 Mbits/sec
[ 4] 4.0- 6.0 sec 196 MBytes 822 Mbits/sec
[ 4] 6.0- 8.0 sec 193 MBytes 809 Mbits/sec
[ 4] 8.0-10.0 sec 196 MBytes 821 Mbits/sec
[ 4] 10.0-12.0 sec 187 MBytes 783 Mbits/sec
[ 4] 12.0-14.0 sec 164 MBytes 690 Mbits/sec
[ 4] 14.0-16.0 sec 166 MBytes 697 Mbits/sec
[ 4] 16.0-18.0 sec 191 MBytes 803 Mbits/sec
[ 4] 18.0-20.0 sec 196 MBytes 820 Mbits/sec
[ 4] 0.0-20.0 sec 1.83 GBytes 787 Mbits/sec
[ 4] local 192.168.0.149 port 5001 connected with 192.168.0.242 port 45775
[ 4] 0.0- 2.0 sec 221 MBytes 928 Mbits/sec
[ 4] 2.0- 4.0 sec 221 MBytes 929 Mbits/sec
[ 4] 4.0- 6.0 sec 222 MBytes 933 Mbits/sec
[ 4] 6.0- 8.0 sec 222 MBytes 933 Mbits/sec
[ 4] 8.0-10.0 sec 222 MBytes 932 Mbits/sec
[ 4] 10.0-12.0 sec 188 MBytes 789 Mbits/sec
[ 4] 12.0-14.0 sec 223 MBytes 935 Mbits/sec
[ 4] 14.0-16.0 sec 222 MBytes 932 Mbits/sec
[ 4] 16.0-18.0 sec 223 MBytes 934 Mbits/sec
[ 4] 18.0-20.0 sec 222 MBytes 933 Mbits/sec
[ 4] 0.0-20.0 sec 2.14 GBytes 918 Mbits/sec
逆向分析 iperf 服务器和客户端：
user@location-b:~# iperf -c server.location-a -i 2 -t 20
------------------------------------------------------------
Client connecting to server.location-a, TCP port 5001
TCP window size: 85.0 KByte (default)
------------------------------------------------------------
[ 3] local 192.168.0.242 port 45778 connected with 192.168.0.149 port 5001
[ ID] Interval Transfer Bandwidth
[ 3] 0.0- 2.0 sec 220 MBytes 921 Mbits/sec
[ 3] 2.0- 4.0 sec 218 MBytes 916 Mbits/sec
[ 3] 4.0- 6.0 sec 217 MBytes 910 Mbits/sec
[ 3] 6.0- 8.0 sec 221 MBytes 926 Mbits/sec
[ 3] 8.0-10.0 sec 213 MBytes 892 Mbits/sec
[ 3] 10.0-12.0 sec 188 MBytes 787 Mbits/sec
[ 3] 12.0-14.0 sec 218 MBytes 916 Mbits/sec
[ 3] 14.0-16.0 sec 218 MBytes 916 Mbits/sec
[ 3] 16.0-18.0 sec 219 MBytes 919 Mbits/sec
[ 3] 18.0-20.0 sec 223 MBytes 937 Mbits/sec
[ 3] 0.0-20.0 sec 2.10 GBytes 904 Mbits/sec
使用 -d 进行双重测试：
user@location-b:~# iperf -c server.location-a -i 2 -t 10 -d
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
------------------------------------------------------------
Client connecting to server.location-a, TCP port 5001
TCP window size: 255 KByte (default)
------------------------------------------------------------
[ 5] local 192.168.0.242 port 45784 connected with 192.168.0.149 port 5001
[ 4] local 192.168.0.242 port 5001 connected with 192.168.0.149 port 52423
[ ID] Interval Transfer Bandwidth
[ 5] 0.0- 2.0 sec 210 MBytes 882 Mbits/sec
[ 4] 0.0- 2.0 sec 45.7 MBytes 192 Mbits/sec
[ 5] 2.0- 4.0 sec 172 MBytes 722 Mbits/sec
[ 4] 2.0- 4.0 sec 50.8 MBytes 213 Mbits/sec
[ 5] 4.0- 6.0 sec 205 MBytes 859 Mbits/sec
[ 4] 4.0- 6.0 sec 65.5 MBytes 275 Mbits/sec
[ 5] 6.0- 8.0 sec 215 MBytes 901 Mbits/sec
[ 4] 6.0- 8.0 sec 73.0 MBytes 306 Mbits/sec
[ 5] 8.0-10.0 sec 223 MBytes 934 Mbits/sec
[ 5] 0.0-10.0 sec 1.00 GBytes 860 Mbits/sec
[ 4] 8.0-10.0 sec 55.0 MBytes 231 Mbits/sec
[ 4] 0.0-10.0 sec 290 MBytes 243 Mbits/sec
在启动 smb 文件传输位置 A -> B 时，iperf 两个方向（从位置 B -> A 启动 smb 文件传输没有问题：
user@location-b:~# iperf -c server.location-a -i 1 -t 30 -r
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
------------------------------------------------------------
Client connecting to server.location-a, TCP port 5001
TCP window size: 238 KByte (default)
------------------------------------------------------------
[ 5] local 192.168.0.242 port 45787 connected with 192.168.0.149 port 5001
[ ID] Interval Transfer Bandwidth
[ 5] 0.0- 1.0 sec 111 MBytes 934 Mbits/sec
[ 5] 1.0- 2.0 sec 109 MBytes 913 Mbits/sec
[ 5] 2.0- 3.0 sec 111 MBytes 928 Mbits/sec
[ 5] 3.0- 4.0 sec 111 MBytes 932 Mbits/sec
[ 5] 4.0- 5.0 sec 111 MBytes 928 Mbits/sec
[ 5] 5.0- 6.0 sec 101 MBytes 844 Mbits/sec
[ 5] 6.0- 7.0 sec 73.8 MBytes 619 Mbits/sec
[ 5] 7.0- 8.0 sec 111 MBytes 929 Mbits/sec
[ 5] 8.0- 9.0 sec 109 MBytes 916 Mbits/sec
[ 5] 9.0-10.0 sec 112 MBytes 938 Mbits/sec
[ 5] 10.0-11.0 sec 109 MBytes 918 Mbits/sec
[ 5] 11.0-12.0 sec 111 MBytes 933 Mbits/sec
[ 5] 12.0-13.0 sec 106 MBytes 891 Mbits/sec
[ 5] 13.0-14.0 sec 85.8 MBytes 719 Mbits/sec
[ 5] 14.0-15.0 sec 112 MBytes 935 Mbits/sec
[ 5] 15.0-16.0 sec 111 MBytes 934 Mbits/sec
[ 5] 16.0-17.0 sec 110 MBytes 924 Mbits/sec
[ 5] 17.0-18.0 sec 112 MBytes 937 Mbits/sec
[ 5] 18.0-19.0 sec 112 MBytes 940 Mbits/sec
[ 5] 19.0-20.0 sec 112 MBytes 935 Mbits/sec
[ 5] 20.0-21.0 sec 111 MBytes 928 Mbits/sec
[ 5] 21.0-22.0 sec 110 MBytes 923 Mbits/sec
[ 5] 22.0-23.0 sec 79.1 MBytes 664 Mbits/sec
[ 5] 23.0-24.0 sec 112 MBytes 937 Mbits/sec
[ 5] 24.0-25.0 sec 112 MBytes 936 Mbits/sec
[ 5] 25.0-26.0 sec 111 MBytes 934 Mbits/sec
[ 5] 26.0-27.0 sec 112 MBytes 937 Mbits/sec
[ 5] 27.0-28.0 sec 111 MBytes 928 Mbits/sec
[ 5] 28.0-29.0 sec 112 MBytes 938 Mbits/sec
[ 5] 29.0-30.0 sec 112 MBytes 941 Mbits/sec
[ 5] 0.0-30.0 sec 3.15 GBytes 901 Mbits/sec
[ 4] local 192.168.0.242 port 5001 connected with 192.168.0.149 port 52898
[ 4] 0.0- 1.0 sec 104 MBytes 872 Mbits/sec
[ 4] 1.0- 2.0 sec 103 MBytes 867 Mbits/sec
[ 4] 2.0- 3.0 sec 97.9 MBytes 822 Mbits/sec
[ 4] 3.0- 4.0 sec 95.9 MBytes 804 Mbits/sec
[ 4] 4.0- 5.0 sec 101 MBytes 851 Mbits/sec
[ 4] 5.0- 6.0 sec 102 MBytes 860 Mbits/sec
[ 4] 6.0- 7.0 sec 103 MBytes 867 Mbits/sec
[ 4] 7.0- 8.0 sec 103 MBytes 868 Mbits/sec
[ 4] 8.0- 9.0 sec 50.0 MBytes 419 Mbits/sec
[ 4] 9.0-10.0 sec 14.8 MBytes 124 Mbits/sec
[ 4] 10.0-11.0 sec 0.00 Bytes 0.00 bits/sec
[ 4] 11.0-12.0 sec 0.00 Bytes 0.00 bits/sec
[ 4] 12.0-13.0 sec 0.00 Bytes 0.00 bits/sec
[ 4] 13.0-14.0 sec 0.00 Bytes 0.00 bits/sec
[ 4] 14.0-15.0 sec 0.00 Bytes 0.00 bits/sec
[ 4] 15.0-16.0 sec 0.00 Bytes 0.00 bits/sec
[ 4] 16.0-17.0 sec 0.00 Bytes 0.00 bits/sec
[ 4] 17.0-18.0 sec 0.00 Bytes 0.00 bits/sec
[ 4] 18.0-19.0 sec 0.00 Bytes 0.00 bits/sec
[ 4] 19.0-20.0 sec 0.00 Bytes 0.00 bits/sec
[ 4] 20.0-21.0 sec 0.00 Bytes 0.00 bits/sec
[ 4] 21.0-22.0 sec 0.00 Bytes 0.00 bits/sec
[ 4] 22.0-23.0 sec 0.00 Bytes 0.00 bits/sec
[ 4] 23.0-24.0 sec 0.00 Bytes 0.00 bits/sec
[ 4] 24.0-25.0 sec 0.00 Bytes 0.00 bits/sec
[ 4] 25.0-26.0 sec 0.00 Bytes 0.00 bits/sec
[ 4] 26.0-27.0 sec 0.00 Bytes 0.00 bits/sec
[ 4] 27.0-28.0 sec 0.00 Bytes 0.00 bits/sec
[ 4] 0.0-28.9 sec 876 MBytes 255 Mbits/sec
答案1
多径反射？尝试将这对线稍微偏移几度，我不知道使用的是哪种调制方式，但我想在 FHSS 样式中，您可能会遇到很多麻烦，而硬件不会发出警告