变更时间：2025-10-27 变更集发布说明：OpenAPI 名称 变更内容概要 操作 UpdateNetworkAclEntries OpenAPI 错误码发生变更。查看变更详情 查看API文档 变更时间：2025-10-17 变更集发布说明：OpenAPI 名称 变更内容概要 操作 AddBgpNetwork...
Asia Pacific Region name Region ID Public network access address VPC access address Australia(Sydney)Closed ap-southeast-2 vpc.ap-southeast-2.aliyuncs.com vpc-vpc.ap-southeast-2.aliyuncs.com Philippines (Manila)ap-...
应用场景：设备的硬件由一个MCU加上一个通信模组构成，设备的应用逻辑运行在MCU上，模组上支持了TCP但是并不支持MQTT，MCU通过模组提供的AT指令来控制模组何时连接云端服务以及收发数据。说明 本示例中：示例app+SDK+TCP模组驱动一起消耗...
在 Internet 协议版本4（TCP/IPv4）属性 对话框中，选中 自动获得 IP 地址(O)和 自动获得 DNS 服务器地址(B)，然后单击 确定。需要辅助私网IP和IPv6地址：打开命令提示符或Windows PowerShell工具。执行以下 ipconfig 命令，查看当前的网络...
不存在 net.ipv4.tcp_sack相关配置 按 i 键进入编辑模式。在文件最下方添加以下配置。net.ipv4.tcp_sack = 1系统显示类似如下。按 Esc 键退出编辑模式。输入:wq，按 Enter 键，保存并退出。执行以下命令，使配置生效。sysctl-p
本文介绍不兼容IPv4网关的公网NAT网关切换至兼容IPv4网关的公网NAT网关的常见问题。切换至兼容IPv4网关过程中是否会导致费用改变？切换过程是否会影响业务？公网NAT网关兼容IPv4网关后，是否可以关闭兼容IPv4网关模式？切换至兼容IPv4网关...
但是可以通过BPF技术进一步基于端口或IPv4地址的策略来控制是否发起或响应这个特殊的TCP选项，从而实现更细粒度的SMC使能控制。为此，Alibaba Cloud Linux 3在 smc-tools 中提供 smc-ebpf 工具来实现BPF策略的使能和配置。执行下列命令，...
但是可以通过BPF技术进一步基于端口或IPv4地址的策略来控制是否发起或响应这个特殊的TCP选项，从而实现更细粒度的SMC使能控制。为此，Alibaba Cloud Linux 3在 smc-tools 中提供 smc-ebpf 工具来实现BPF策略的使能和配置。执行下列命令，...
ipv4.tcp_tso_win_divisor = 3 net.ipv4.tcp_congestion_control = cubic net.ipv4.tcp_abc = 0 net.ipv4.tcp_mtu_probing = 0 net.ipv4.tcp_base_mss = 512 net.ipv4.tcp_workaround_signed_windows = 0 net.ipv4.tcp_challenge_ack_limit = 1000 net....
ipv4.tcp_no_metrics_save = 0 net.ipv4.tcp_moderate_rcvbuf = 1 net.ipv4.tcp_tso_win_divisor = 3 net.ipv4.tcp_congestion_control = cubic net.ipv4.tcp_abc = 0 net.ipv4.tcp_mtu_probing = 0 net.ipv4.tcp_base_mss = 512 net.ipv4.tcp_workaround_signed_windows = 0 net....
问题原因 出现该问题的原因是ECS实例中tcp的连接数太多，超出了net.ipv4.tcp_max_tw_buckets内核参数定义的值。tcp_max_tw_buckets：表示系统同时保持TIME_WAIT状态的Sockets最大数量，如果超过这个数字，TIME_WAIT状态的Socket会被结束...
400 Mismatch.Ipv4PrefixAndNatIpCidr The%s and%s are mismatched.The Ipv4Prefix and NatIpCidr are mismatched.400 Mismatch.Ipv4PrefixAndCidrReservations The%s and%s are mismatched.Ipv4Prefix和交换机预留网段不匹配。400 ...
this issue may be caused by the following TCP kernel parameters:net.ipv4.tcp_tw_recycle = 1 net.ipv4.tcp_tw_reuse = 1 net.ipv4.tcp_timestamps = 1 The captured packets show that this issue occurs because the SLB instance deletes the net....
This topic describes the cause of and solution to the issue that the...net.ipv4.netfilter.ip_conntrack_max = 3276800 net.ipv4.tcp_tw_recycle = 0 net.ipv4.tcp_tw_reuse = 0 net.ipv4.tcp_orphan_retries = 1 net.ipv4.tcp_fin_timeout = 25 net....
dhcp UDP/UDP6 323 chronyd TCP/UDP 5355 systemd-resolve 内核区别 sysctl系统参数 说明 sysctl系统参数差异较多，本文仅给出重要的sysctl差异说明。变更配置项 sysctl CentOS 7 x86 Alibaba Cloud Linux 3 x86&Arm64 说明 Linux社区补丁...
本文介绍如何提高Nginx Web服务器的安全性的操作...may break some programs 32768 kernel.pid_max=65536#Increase system IP port limits net.ipv4.ip_local_port_range = 2000 65000 # IncreaseTCP max buffer size setable using setsockopt()...
double-click Internet Protocol Version 4(TCP/IPv4).In the Internet Protocol Version 4(TCP/IPv4)Properties dialog box,select Obtain an IP Address Automatically.(Optional)Prepare network resources If you only need to modify ...
400 Mismatch.Ipv4PrefixAndNatIpCidr The%s and%s are mismatched.The Ipv4Prefix and NatIpCidr are mismatched.400 Mismatch.Ipv4PrefixAndCidrReservations The%s and%s are mismatched.Ipv4Prefix和交换机预留网段不匹配。400 ...
click the primary ENI named Ethernet.Then,click Properties in the Ethernet Status dialog box.In the Ethernet Properties dialog box,double-click Internet Protocol Version 4(TCP/IPv4).In the Internet Protocol Version 4(TCP/...
This topic describes the...the TCP/UDP protocol allows the local port number to be modified as needed.When most of the ports in this range are occupied,the kernel's linear search for a new port may cause high CPU utilization....
click Properties in the Ethernet Status dialog box.In the Ethernet Properties dialog box,double-click Internet Protocol Version 4(TCP/IPv4).In the Internet Protocol Version 4(TCP/IPv4)Properties dialog box,select Obtain an...
This topic describes how to resolve the Cannot assign requested address error that occurs when a client accesses a Tair(Redis OSS-compatible)instance over a short-lived connection.Cause Applications that experience this ......
By default,the TCP/IP TIME_WAIT state in the Linux kernel lasts for a fixed 60-second period.In certain high-load TCP scenarios,reducing this timeout can improve network performance.To enable this,Alibaba Cloud Linux 2...
IPv4地址不支持配置为0.0.0.0和255.255.255.255。IPv6地址不支持配置为:和ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff。前提条件 已购买DDoS高防（中国内地）实例或DDoS高防（非中国内地）实例。具体操作，请参见 购买DDoS高防实例。操作步骤...
check the domain name resolution settings and ICP filing status.Check whether an IPv4 gateway is configured:When used with an IPv4 gateway,make sure the NAT gateway is in NAT mode and the routes are correctly configured....
secondary private IPv4 addresses are configured.For information about how to configure IPv6 addresses,see IPv6 communication.The following table describes the assignment of secondary private IPv4 addresses to the primary ...