Newcomer's Guide On How To Set Up A Japanese Native Ip, Including Environment Preparation And Port Forwarding Settings

1.

overview: what is japanese native ip and its applicable scenarios?

• definition: japanese native ip refers to the public ipv4/ipv6 address assigned in the japanese data center (local isp host).
• applicable: used for localization services, accessing geographically restricted resources, and improving the response speed of domestic japanese users.
• advantages: low latency (average latency from tokyo to eastern china can reach 20–50ms), convenient compliance.
• risks: data sovereignty, compliance and ddos risks need to be considered, and some providers will review traffic.
• the goal of this article: to explain step by step environment preparation, vps selection, domain name/cdn, and port forwarding configuration and defense strategies.

2.

select vps/host and native ip acquisition process

• common providers: linode (tokyo), vultr (tokyo), aws (ap-northeast-1), さくらのvps, conoha.
• package considerations: it is recommended to start with at least 1 vcpu / 2gb ram / 50gb ssd, a bandwidth of 1gbps port, and a monthly traffic of more than 3tb if there is external access demand.
• ip type: confirm whether to allocate native public ipv4 (non-cgnat). bare metal or independent ipv4 address pool may be required.
• purchase process: registration - real-name authentication - select tokyo computer room - select public ip and purchase; some manufacturers support hourly billing for testing.
• cost estimate: a vps 2gb configuration in a tokyo computer room costs about $5–$20/month. if independent static ipv4 is scarce, the price may increase by $1–$3/month.

3.

environment preparation: basic system and network configuration

• operating system: ubuntu 22.04 lts or debian 12 is recommended. security updates and long-term support facilitate operation and maintenance.
• basic software: install and configure ssh (modify the default port), fail2ban, ufw or iptables as a firewall. command example: ufw allow 22/tcp (replace with custom ssh port).
• network monitoring: deploy vnstat or iftop for bandwidth monitoring. it is recommended to set bandwidth threshold alarms (such as email notifications when traffic approaches the monthly limit).
• reverse analysis: configure ptr records for business needs (submit work orders to suppliers) to improve email delivery rate and reputation.
• ddos protection: evaluate whether to enable the vendor's own anti-ddos or third-party cdn (such as cloudflare spectrum, akamai) for upstream cleaning.

4.

domain name, dns and cdn configuration points

• dns resolution: point the domain name a record to the japanese native ip ; if using load balancing, please configure multiple a records or use traffic management.
• cdn strategy: static resources are cached through cdn. if dynamic requests require direct connection to the origin site, load balancing or custom caching rules can be used.
• ttl setting: set ttl short (60s) during the test phase. after stabilization, it can be adjusted high (300s or higher) to reduce the amount of dns queries.
• https certificate: it is recommended to use let's encrypt to automatically issue and renew. please note that the acme verification method selects http-01 or dns-01.
• domain name and whois: ensure domain name information is compliant and enable domain name locking and registered email address reachability.

5.

port forwarding and firewall (nat, dnat, port mapping)

• scenario 1 (nat gateway): if there are multiple servers on the intranet that need to forward specific ports of the public ip to the intranet ip, use iptables dnat rules.
• example (iptables dnat): 1) iptables -t nat -a prerouting -p tcp --dport 443 -j dnat --to-destination 192.168.0.10:443
2) iptables -t nat -a postrouting -j masquerade (processing snat/outbound).
• example (ufw port forwarding): add nat rules in /etc/ufw/before.rules and enable ipv4 forwarding.
• security principles: only open necessary ports (such as 80, 443, custom ssh ports), and whitelist restrictions and login audits for management interfaces.
• port mapping record: it is recommended to maintain a port mapping table, including public network port, intranet ip, service description and effective time (see the table below).

6.

real cases and server configuration examples

• case background: e-commerce saas needs to deploy an api server in japan that is close to japanese users, supports a peak request rate of 1,000 times per second, and requires low latency and anti-ddos capabilities.
• selection and configuration: select the tokyo computer room vps cluster. the main node uses 2 vcpu/4gb/80gb ssd. the backup node has the same configuration. the load balancer is front-loaded and connected to the cdn.
• protection: enable vendor-based ddos protection and set web application firewall rules and rate limits in cloudflare.
• monitoring and expansion: prometheus+grafana monitoring, automatically triggering the expansion plan when the cpu threshold reaches 80%.
• port/mapping example table (showing configuration data):

project	example value	illustrate
public ip	203.0.113.45	japanese computer room sample document ip (example only)
host configuration	2 vcpu/4gb/80gb ssd	meet the api needs of small and medium traffic
bandwidth	1 gbps / 3 tb per month	avoid burst traffic being rate-limited
port forwarding	443 -> 192.168.0.10:443	public network 443 is mapped to the intranet api node

7.

online and operation and maintenance suggestions

• check before going online: security groups, nat rules, certificates, and dns resolution are effective and stress tested to 1.5 times the peak value.
• backup strategy: combine snapshots with off-site backup. it is recommended that the database be master-slave and set up automatic backup (retention period is at least 7 days).
• logging and auditing: centralized logs (elk or cloud log service), setting alarms for abnormal logins and sudden traffic increases.
• disaster recovery and switchover: prepare backup nodes and dns failover strategies (ttl short, health check).
• continuous optimization: adjust caching strategy, number of connections, and horizontal expansion threshold based on monitoring data.