How to Reliably Connect Multi-Site Offices, Factories, and Public Clouds into One Enterprise Intranet?

What to sort out before connecting multi-site offices, factories, and public clouds

Rushing into multi-site networking without a unified plan leads to avoidable headaches. Before shipping access devices or turning up cloud connections, we help you review three essentials:

• Resolve overlapping internal IP addresses: Many branch offices and older factories kept default internal subnets such as 192.168.1.x when setting up their broadband routers. That works fine when each site accesses the internet independently, but once they join the same enterprise intranet, duplicate addresses prevent computers from knowing which location should receive the data. Before connecting your sites, we help verify subnets across locations, adjust addresses or design translation rules for conflicting sites, and reserve address space for future sites.
• Set access permissions around actual business needs: Joining the same network does not mean opening unrestricted access between every department. R&D teams accessing code repositories and test clouds, overseas sales offices logging in to headquarters ERP, and factories sending production reports back to headquarters only need permissions for their respective systems. Likewise, if certain locations run scheduled overnight cross-site backups or synchronise large engineering drawings, letting us know in advance allows us to plan transmission capacity accordingly.
• Maintain shop-floor security isolation in manufacturing plants: For enterprises with manufacturing factories, our network connectivity handles stable cross-site transmission between plant sites, headquarters, and the cloud; meanwhile, isolation of shop-floor production machinery, one-way data collection, and industrial security management continue to follow your existing factory safety and compliance rules, without relaxing shop-floor boundaries because the intranet is connected.

Keep existing broadband at each location and choose access methods by office and data centre conditions

To build a cross-region enterprise intranet, you can directly use the existing public internet broadband at each office and factory without cancelling current broadband plans or waiting for construction of new physical dedicated lines, resulting in faster provisioning than traditional carrier dedicated lines; you can also scale up bandwidth on demand as business grows or during peak transfer periods. Once connected, employees continue using existing local broadband for everyday web browsing, while cross-city and cross-border intranet traffic and cloud access travel over our transmission channel (general internet browsing that stays directly on local broadband remains subject to local carrier broadband quality).

Depending on on-site conditions and staffing at each site, we offer flexible device and access options:

If your workloads span multiple public clouds such as Alibaba Cloud and Azure, you can read our Alibaba Cloud, Azure, and multi-site office cross-cloud private network guide for details on cross-cloud address planning, round-trip routing paths, and cloud provider billing.

Our practical approach in cross-border multi-site and multi-cloud networking projects

We built a unified enterprise network covering multiple domestic and overseas offices and multi-cloud environments for a Suzhou precision equipment manufacturer. The enterprise needed to connect 5 offices in mainland China (Suzhou headquarters, Xi'an, Beijing, Shanghai, and Shenzhen) and 5 overseas offices (Malaysia, Japan, South Korea, Germany, and Oregon in the US)—10 office locations in total—along with 5 public cloud environments across Alibaba Cloud Shanghai, Alibaba Cloud Hong Kong, Alibaba Cloud Malaysia, Alibaba Cloud Japan, and Azure Frankfurt.

While preserving existing network access at each location, we helped the enterprise streamline three daily needs on a single network: first, intranet system traffic between domestic and overseas offices and the Suzhou headquarters runs directly over our cross-region transmission channel, eliminating peak-hour lag on the public internet; second, R&D and business staff across locations connect to the nearest PoP for stable access to public cloud R&D, test, and production environments in different countries and regions; third, we planned a unified dedicated internet egress for mainland China offices and public cloud environments so that when teams need compliant, stable access to external AI services such as ChatGPT and Claude or connect to partners requiring fixed source IP addresses, the network automatically routes that traffic to the dedicated egress while keeping it isolated from core production workloads.

Backup protection for critical sites and expansion arrangements for adding new sites later

For critical sites that cannot afford downtime—such as headquarters, core manufacturing plants, and data centres—we support dual-device high availability in an active-standby setup (where the standby device automatically takes over if the primary device fails), combined with dual on-site broadband or wired-plus-cellular links and multiple backup paths inside our transmission network to reduce the impact of a single circuit or hardware failure on production and office operations.

As each site goes live, we verify actual access performance to headquarters systems and target cloud environments with you, test automatic active-standby failover, and document the subnets, access permissions, and onboarding workflow for future branch sites to simplify daily management and site expansion.