How many ways are there to attack traffic?

DDoS attacks fall into one of two categories: either large data, heavy traffic to overwhelm network devices and servers, or the intentional creation of a large number of incomplete requests that cannot be completed to quickly exhaust server resources.

The key difficulty in effectively preventing DDoS attacks is the inability to distinguish attack packets from legitimate packets: typical "signature" pattern matching performed by IDSs is ineffective; many attacks use source IP address spoofing to escape source identification, making it difficult to search for a specific attack source. There are two basic types of DDoS attacks: ● Bandwidth attacks: These attacks consume network bandwidth or flood one or more routers, servers, and firewalls with a large number of packets; a common form of a bandwidth attack is a large number of ostensibly legitimate TCP, UDP, or ICMP packets that are delivered to a specific destination; to make detection more difficult, these attacks also often use source address spoofing, which is constantly changing. changing. ● Application attacks: use the behavior defined by protocols such as TCP and HTTP to continually tie up computing resources to prevent them from processing normal transactions and requests. http half-open and http error are two typical examples of application attacks.

Router ddos defense settings?

1, source IP address filtering

Source IP address filtering at all ISP network access or aggregation nodes can effectively reduce or eliminate source IP address spoofing, making SMURF, TCP-SYNflood and other ways of DDoS attacks impossible to implement.

2. Traffic Restriction

Controlling certain types of traffic, such as ICMP, UDP, and TCP-SYN traffic at network nodes, and restricting their sizes to reasonable levels can mitigate the impact of denial of DDoS attacks on the bearer network and the target network.

3. ACL Filtering

Without affecting the business, it filters the traffic of worm attack ports and control ports of DDoS tools.

4. TCP Interception

For TCP-SYNflood attacks, the user side can consider enabling the TCP interception function of the gateway device to defend against them. Since enabling TCP interception may have some impact on router performance, comprehensive consideration should be given when using this feature.

What is an active malicious attack on a network?

Active malicious attacks consist of intentional behavior by an attacker to access information he needs. Examples include logging in remotely to port 25 of a specified machine to find out information about a mail server run by a company; spoofing an invalid IP address to connect to a server, so that a system receiving an incorrect IP address wastes time trying to connect to whichever illegal address.

The attacker is actively doing something to disadvantage you or your company's systems.