How to prevent DOS attacks on routers? Professional protection guides to help

with the increasing demand for digital office and home Internet access, the router is the core hub of network access, and its security is directly related to the stable operation of the entire network. Router DOS attack is one of the common network threats. It exhausts the bandwidth, memory and other resources of the router by sending a large number of invalid requests, resulting in legitimate users unable to access the network normally. Whether home users or enterprise users may be affected by it. This article will share professional protection methods in an all-round way from attack identification, protection measures to emergency response to help users effectively avoid such network risks.

How to identify a router DOS attack?

to prevent DOS attacks on routers, we must first accurately identify the characteristics of such attacks in order to intervene in the early stage of the attack and avoid network paralysis.

1, observe abnormal network performance

router DOS attack occurs, the most intuitive performance is that the network suddenly card or even completely interrupted, even if some networking devices can not return to normal. At the same time, the router's indicator light will appear abnormal flashing, such as LAN port or WAN port indicator light continues to flash at high speed, far more than the frequency of normal Internet access, some routers will also appear temperature rise.

2 View router log information

most mainstream routers have their own system log function, users can view the log content through the management background. If there are a large number of repeated requests from the same IP or different IP in the log, and the request frequency is much higher than the normal traffic, it is likely to encounter a router DOS attack. In addition, if the log frequently appears resource exhaustion and connection timeout prompts, it can also be used as the basis for attack identification.

Second, the basic protection measures of router DOS attack

basic protection is the first line of defense against DOS attacks on routers, such operations do not require complex technology, but can greatly reduce the probability of successful attacks.

1, strengthen the router account security

many router DOS attacks are launched by cracking the weak password of the router, so first modify the default administrator account and password, avoid the use of admin, 123456 and other common weak passwords, it is recommended to use letters, numbers, special symbols combination of complex passwords, while regularly changing passwords. In addition, to turn off the remote management function of the router to prevent attackers from extranet direct access to the management background.

2, timely update router firmware

router vendors regularly release firmware updates that not only optimize device performance, but also fix known security bugs, which are exploited in some router DOS attacks. Users should regularly log in to the router management background to check for available firmware updates and follow official guidelines to complete the upgrade to ensure that the router system is in the latest security state.

3. Advanced protection methods for router DOS attacks

for more targeted DOS attacks on routers, basic protection may be difficult to fully resist, and advanced protection measures are required to improve the cyber security level.

1, configure the access control list

ACL for short, users can configure this function in the router management background to allow or deny access requests for specific Internet Protocol Addresses. For enterprise users, the IP of internal employees' office equipment can be added to the allowed list to deny access to other unfamiliar IPs; home users can restrict IP access other than common devices to reduce the potential entry of router DOS attacks.

2, enable flow cleaning and speed limit function

some high-end routers support traffic cleaning and speed limit functions. Traffic cleaning can identify and filter out invalid traffic generated by attacks, and only allow legitimate traffic to pass through; speed limit function can set the maximum access bandwidth of a single IP to avoid a single IP sending a large number of requests to exhaust router resources. Turn on these two functions to effectively alleviate the resource occupation problem caused by router DOS attacks.

IV. Emergency response methods for router DOS attacks

unfortunate encounter router DOS attack, timely emergency response can minimize the loss caused by the attack, quickly restore the normal operation of the network.

1, temporarily block the attack source IP

locate the source IP of the attack through the router log or traffic monitoring tool, the IP can be blacklisted in the router management background to temporarily block its access request. If the attack comes from multiple IPs, batch blocking can be used, and network operators can be contacted to request assistance in intercepting such abnormal traffic.

2, reboot the router and restore the configuration

If the router is paralyzed due to the attack, you can power off and restart the router first, and empty the invalid request of the device cache. If the network has not been restored after restart, you can restore the router to the factory settings, and then reconfigure the network parameters. Note that the administrator password should be changed immediately after the recovery settings to avoid attackers from using weak passwords to launch router DOS attacks again.

To sum up, preventing DOS attacks on routers requires a complete security closed loop from identification, protection to emergency response. Daily basic protection, timely update firmware, strengthen account security; advanced stage can use access control, traffic cleaning and other functions to improve the protection level; when attacked, quickly locate the source of the attack and take emergency measures. Only by building a multi-dimensional security line can we effectively ensure the stable operation of the router and the entire network, and avoid various losses caused by attacks.