Network security is a systematic project, and network equipment, as critical infrastructure, faces diverse attack threats. Especially in high defence server and CDN scenarios, equipment security directly affects business continuity and data reliability. The following are the core points of network equipment security protection:
I. Common types of attacks on network devices
| Type of attack | means of attack | potential harm |
|---|---|---|
| Malicious Login Control | Illegal reboot of equipment, tampering with configuration | Service interruption, data leakage |
| Control Message Flooding Attack | Sending a large number of ICMP messages consumes CPU resources | Equipment performance degradation and business paralysis |
| protocol port penetration | Intrusion using unclosed Telnet/FTP ports | Privilege theft, malicious code implantation |
Second, the high-defence scene equipment security reinforcement strategy
▶ Strategy 1: Minimise open ports
# Close unused physical ports (example: Huawei device) <SW1>system-view [SW1] port-group protgroup1 [SW1-port-group-protgroup1] group-member GigabitEthernet0/0/4 to GigabitEthernet0/0/48 [SW1-port-group-protgroup1] shutdown # Disable high-risk protocol services [SW1] undo ftp server Warning: The operation will stop the FTP server. continue? [Y/N]: y
▶ Strategy 2: Force encrypted communication protocols
| business need | insecure protocol | Safe Alternatives |
|---|---|---|
| rlogin | Telnet | SSH v2 |
| file transfer | FTP/TFTP | SFTP |
| Webmaster Login | HTTP | HTTPS |
III. Core protection technology practices
1. SSH Secure Access Configuration
# Generate RSA key pair [Huawei] rsa local-key-pair create Generating keys..(GROANS) Done. # Configuring SSH Users and Authentication [Huawei] ssh user client001 authentication-type password [Huawei] ssh user client002 authentication-type rsa # Enable dynamic port defence (to circumvent standard port scanning) [Huawei] ssh server port 1025
2. Local anti-attack configuration scheme
# Creating Anti-Attack Policies [Huawei] cpu-defend policy anti-ddos # Blacklist filtering (based on MAC address) [Huawei-cpu-defend-policy] blacklist 1 acl 4001 # Protocol Level Speed Limiting and Priority Scheduling [Huawei-cpu-defend-policy] packet-type arp-request rate-limit 64 [Huawei-cpu-defend-policy] packet-type dhcp-client priority 3 # Enable Attack Traceability [Huawei-cpu-defend-policy] auto-defend enable [Huawei-cpu-defend-policy] auto-defend threshold 50
Fourth, the special optimisation of high-defence scenarios
▶ URPF anti-spoofing protection
| paradigm | Detection rules | Applicable Scenarios |
|---|---|---|
| strict model | Verify source IP routing + incoming interface consistency | Edge Network Border Protection |
| relaxed mode | Verify source IP route presence only | Core network traffic filtering |
▶ Dynamic link protection (to safeguard critical services)
# Enable SSH/FTP/BGP Session Protection [Huawei] cpu-defend application-apperceive ssh ftp bgp
V. Operation and Maintenance Monitoring Recommendations
- log analysis: Regular inspections
display cpu-defend policyOutput to identify anomalous traffic patterns - Performance Baseline: Monitor CPU utilisation thresholds, recommend setting **70%** alarm trigger line
- Black and white list linkage: Dynamically updating device ACL rules in conjunction with the IP reputation repository of a high defence CDN