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As we move to a post pandemic world, the global shift back to in office work is beginning,albeit slowly. Most respondents in the US, UK, Germany, and China still work from home,but 20% of them anticipate doing more office work over the next 12 months. Nearly 90% of respondents in Japan anticipate continuing to work from home, with 40% of respondents in India expecting more remote working than the previous 12 months.

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The findings below show which sound quality related features matter most to consumers,assuming the device meets the fundamental requirements for sound quality, battery life, ease of use, and price,

Responses indicate that consumers will seek richer, more reliable, and more seamless experiences in the future.

Percentage of true wireless earbud purchases likely to be influenced by sound quality improvement features

.Robust connectivity with no dropouts or glitches
.Active noise cancellation
.Crystal clear voice calls
.Automatic Bluetooth pairing
.Lossless audio quality/music streaming

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sudo su
sudo apt-get install iptables-persistent
modprobe ip_tables #启动iptable
 
#删除原有iptables规则
iptables -F
iptables -X
 
#抛弃所有不符合三种链规则的数据包
iptables -P INPUT DROP
iptables -P OUTPUT DROP
iptables -P FORWARD DROP
 
＃设置：本地进程 lo  的 INPUT 和 OUTPUT 链接
iptables -A INPUT -i lo -j ACCEPT
iptables -A INPUT -m state --state ESTABLISHED,RELATED -jACCEPT
iptables -A INPUT -m state --state NEW,INVALID -j LOG
iptables -A OUTPUT -o lo -j ACCEPT
 
#打开 ssh 端口 控制 出和入
iptables -A INPUT  -p TCP  --dport 22 -j ACCEPT
iptables -A OUTPUT -p TCP --sport 22 --dport 1024:65535 -j ACCEPT

#打开 http端口 控制 出和入
iptables -A INPUT  -p TCP  --dport 80 -j ACCEPT
iptables -A OUTPUT -p TCP --sport 80 --dport 1024:65535 -j ACCEPT
#开出的端口，严格控制出入
#--------------------------------
 
#保存配置  存储位置/etc/iptables/iptables-persistent 会在开机启动时自动load之前的iptables设置
#iptables-persisten是bash脚本，位置在/etc/
service iptables-persistent save
 
--------------------------------------------------
2.关闭iptables
sudo su
iptables -F
iptables -X
iptables -Z
iptables -P INPUT ACCEPT
iptables -P OUTPUT ACCEPT
iptables -P FORWARD ACCEPT
modprobe -r ip_tables
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封单个IP的命令是：
iptables -I INPUT -s 211.1.0.0 -j DROP

封IP段的命令是：
iptables -I INPUT -s 211.1.0.0/16 -j DROP
iptables -I INPUT -s 211.2.0.0/16 -j DROP
iptables -I INPUT -s 211.3.0.0/16 -j DROP

封整个段的命令是：
iptables -I INPUT -s 211.0.0.0/8 -j DROP

封几个段的命令是：
iptables -I INPUT -s 61.37.80.0/24 -j DROP
iptables -I INPUT -s 61.37.81.0/24 -j DROP

想在服务器启动自运行的话有三个方法：
1、把它加到/etc/rc.local中
2、iptables-save >;/etc/sysconfig/iptables可以把你当前的iptables规则放到/etc/sysconfig/iptables中，系统启动iptables时自动执行。
3、service iptables save 也可以把你当前的iptables规则放/etc/sysconfig/iptables中，系统启动iptables时自动执行。
后两种更好此，一般iptables服务会在network服务之前启来，更安全。

解封的话：
iptables -D INPUT -s IP地址 -j REJECT
iptables -F 全清掉了

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