1.

Overview: Why KT station group chooses independent IP to reduce abuse and traffic pollution

• South Korea's KT, as the network carrier, provides independent public IPs for site groups (multiple sites hosted under the same logical service) out of security and stability considerations.
• An independent IP can isolate the abusive behavior of a single site from its neighbors, preventing "one crime" from causing the entire IP segment to be blacklisted.
• Especially important for SEO and mailing (email) reputation, independent IP avoids the impact of spam or spam traffic caused by shared IP.
• In terms of international connections and BGP policies, independent IP is conducive to refined routing, traffic engineering and backhaul path optimization.
• When connecting CDN, WAF and anti-DDoS, independent IP makes the policy granularity higher, the rules more precise, and the accidental damage rate is reduced.

2.

Technical implementation and network level measures of independent IP

• IP allocation method: Allocate independent public network IP or small segment address pool through the operator (KT) according to /32 or /128 (IPv6) under the AS number.
• BGP and routing: Configure dedicated prefixes for key sites and annotate them through the BGP community to implement routing preferences based on geography or policy.
• Port and traffic isolation: Use virtual switches (vSwitch) and security groups to bind different IPs to different VLANs to physically and logically isolate traffic.
• Access link: Multi-line BGP, multi-egress paths (N×10Gbps) and RTBH/FlowSpec enable rapid discarding of abnormal traffic.
• Logging and monitoring: NetFlow/sFlow, BGP monitoring, and external IP reputation query (Spamhaus, AbuseIPDB) are used to determine and isolate abnormal sources in real time.

3.

Common technology stacks to prevent abuse and traffic pollution

• DDoS cleaning: The upstream ISP or third-party cleaning platform (Scrubbing Center) performs blackhole/cleaning switching for large traffic attacks and cooperates with Anycast distribution.
• WAF and rate limiting: Deploy WAF (ModSecurity, commercial WAF) at the application layer, combined with IP rate limit, connection number limit, and request rate threshold.
• Behavior detection: Abnormal behavior detection (abnormal UA, frequent access, abnormal session duration) based on machine learning or rules.
• Host security: Enable fail2ban, iptables/nftables, and OSSEC/SELinux on the VPS/host to reduce the risk of being compromised and becoming the source of attacks.
• CDN and caching strategy: Put static content on CDN nodes to reduce the load on the origin site. The CDN itself provides edge protection and isolates the origin site IP exposure.

4.

Common configuration examples and specific server specifications display

• The following table lists examples of typical KT station group independent IP server configurations and corresponding protection capabilities (with real reference specifications and indicators).

Server type	vCPU	Memory	Disk	Bandwidth/Port	DDoS protection capabilities
Lightweight (micro site)	2 vCPU	4 GB	50 GB SSD	100 Mbps exclusive	Upstream cleaning + WAF, handling burst 10 Gbps
Standard type (small and medium-sized sites)	4 vCPU	8 GB	200 GB SSD	1 Gbps dedicated line	Traffic cleaning + Anycast, handling burst 50 Gbps
High availability (large site)	8 vCPU	32 GB	1 TB NVMe	10 Gbps Aggregation	Multi-layer cleaning + hardware ACL, handling burst 200+ Gbps

• The data in the table are common configuration examples, and actual deployment will be adjusted based on business peaks and SLA.
• Typical software stack on the server: Nginx/Apache, Redis, MariaDB, Fail2ban, ModSecurity, Prometheus + Grafana.
• Network policy example: Each IP is bound to an independent security group, and the entry rule only opens the ports required for the business (HTTP/HTTPS, SSH only IP).
• Key points for daily operation and maintenance: automated vulnerability patching, automatic certificate renewal (Let's Encrypt + ACME), and regular IP reputation checks.

5.

Real case: The effect of a cross-border e-commerce company after KT independent IP deployment

• Background: A cross-border e-commerce company deployed a site cluster in Seoul. It originally used shared IPs and was frequently affected by email and crawler abuse from neighboring sites.
• Solution: Migrate to the independent IP solution provided by KT. Each store is assigned an independent public IP and connected to KT's upstream cleaning and CDN.
• Configuration details: Standard instance (4 vCPU/8GB/200GB SSD/1Gbps), independent IP + BGP multi-line export, WAF rule customization.
• Example of performance data (before and after migration):
- Email delivery rate: increased from 72% to 95%;
- The number of blacklist triggers: the monthly average dropped from 6 times to 0 times;
- Average page response: optimized from 420ms to 160ms (including CDN acceleration).
• Lessons and optimization: It is necessary to debug the WAF whitelist in the initial stage to avoid false blocking; it is recommended to use dedicated IP for SMTP services and cooperate with SPF/DKIM/DMARC.

6.

Abuse management process and emergency response suggestions

• Monitoring and alarming: Establish a baseline traffic curve, and abnormal traffic (sudden increase >3×baseline and not business peak) triggers automatic alarms.
• Layered protection: edge CDN cleaning → upstream ISP cleaning -> origin WAF/host protection, reducing attack pressure layer by layer.
• Blacklist and appeal: If an IP is included in a public blacklist (Spamhaus, etc.), you should quickly determine the reason and unblock it through appeal.
• Rapid isolation: Immediately disconnect the host confirmed to be compromised, replace the key, and re-upload the clean snapshot.
• Regular drills: Conduct DDoS and abuse emergency drills every quarter to test the response timeliness of the process and tool chain.

7.

Implementation suggestions and conclusions

• If the business is sensitive to reputation and availability, use an independent public IP first and combine it with KT upstream cleaning and Anycast CDN.
• Prepare IP allocation and BGP policies to avoid putting all key services on the same IP or routing policy.
• Treat security as a continuous investment: WAF, logs, IP reputation, and automated detection are all indispensable.
• Performance and cost trade-off: The lightweight version can save costs but has weak DDoS tolerance, while the high-availability version is more expensive but has a more reliable SLA.
• Summary: The use of independent IPs for KT station groups is an effective practice to prevent abuse and reduce traffic pollution, but it requires a complete network, application and operation and maintenance strategies to minimize risks.