Shulou(Shulou.com)06/03 Report--

Does the CVM need a firewall? Firewall is mainly composed of service access policy, verification tools, packet filtering and application gateway. Firewall is a software or hardware located between the computer and the network it is connected to. All network traffic flowing in and out of the computer goes through the firewall. It can be seen that the firewall is an indispensable part of network security.

Firewall is the Barrier of Network Security

A firewall (as a blocking point, control point) can greatly improve the security of an internal network and reduce risk by filtering insecure services. Because only carefully selected application protocols can pass through the firewall, the network environment becomes more secure.

For example, firewalls can prohibit notoriously insecure NFS protocols from entering and leaving the protected network, so that it is impossible for external attackers to use these fragile protocols to attack the internal network. Firewalls also protect the network from routing-based attacks, such as source routing attacks in IP options and redirect paths in ICMP redirects. The firewall should be able to reject the attack message and notify the administrator.

The role of firewalls

1. Packet filtering. According to the definition of firewall, any way that can effectively prevent illegal connections to the network is regarded as a firewall.

2. Block external attacks. If the information sent by the user is not allowed by the firewall setting, the firewall will block it immediately to prevent it from entering the server behind the firewall.

3. Record the attack. In fact, the firewall can record all the attacks if necessary, but for the sake of efficiency, the general task of recording the attack is left to IDS.

Therefore, the cloud server needs a firewall. High defense cloud servers have high defense data centers, exclusive bandwidth resources, are not affected by other users, are resistant to attacks, and have higher security.

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