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DOMAIN 02 · INDUSTRIAL NETWORKING

Multi-Branch VPN Interconnection Solution: Every Store and Site on One Network

Chain stores, clinics, depots, regional offices — when the business grows faster than the network, every site becomes an island. This solution links all branches to headquarters over encrypted IPSec tunnels riding ordinary broadband, with dual-egress failover per site and every tunnel visible on one management screen. Sized at 3, 10 or 50 branches, on enterprise VPN-router and firewall product categories, with the equipment brand chosen openly.

The Multi-Site Problem

Four things every growing chain tells us, almost word for word:

Branch data silosSales figures leave stores by spreadsheet and messenger app. HQ consolidates by hand, days late — nobody trusts the numbers.
Leased lines cost too muchCarrier point-to-point circuits between every site and HQ are priced for banks — multiplied by branch count, the business case dies.
Opening a branch takes weeksEvery new store needs an engineer on site to configure the network by hand — connectivity becomes the slowest step of expansion.
One line down, store offlineSingle broadband per store means one ISP fault stops the POS and blinds HQ — and nobody at the branch knows how to fix it.

Architecture: Hub at HQ, Encrypted Tunnels to Every Branch

One hub, N spokes — each branch is a stamped copy of the same template, so the fleet stays manageable at any size:

HEADQUARTERS ERP · files · cameras platform servers Core switch Dual VPN gateways (hub) active/standby — one fails, tunnels move to the other Internet ordinary broadband — no leased lines 4G/5G backup path IPSec tunnels · AES encrypted BRANCH 01 · flagship store VPN router · PoE switch · POS & PCs dual egress: broadband + 4G SIM BRANCH 02 · office VPN router · PoE switch · PCs & Wi-Fi same template, different scale BRANCH N · new site config template pushed — online in hours add branches without touching HQ CENTRAL MANAGEMENT every site's tunnel state, link quality and config on one screen — HQ IT sees all branches upgrade path: same categories grow into SD-WAN

Architecture drawn by AtlasCommTech following carrier-grade branch-interconnection design practice. Diagram labels are kept in English for engineering clarity.

Why us: our founder spent 13 years inside the Huawei partner ecosystem delivering carrier networks — hub-and-spoke topologies with far more than fifty spokes. Your branch fleet is a familiar shape.

Equipment Options

The solution is sized to your requirements and budget first — the same architecture can be delivered on several vendors' product lines. We help you choose by supply availability in your destination country, budget and your team's operating habits.

Huawei — enterprise campus, WAN and security linesMature ecosystem with a global service network.
ZTE & Wantone — comparable datacom linesPrice-performance direction; supply runs smoother in some markets.
H3C — campus and data-center linesWidely deployed campus and data-center portfolio.
Atlas industrial switches — industrial-scenario access layerOur own industrial line — compatible with any brand's core layer.

What the Design Delivers

Six capabilities that turn scattered sites into one operable network:

IPSec encryption over broadbandStandard AES-encrypted tunnels over the internet lines you already pay for — leased-line privacy at broadband cost.
Hub-and-spoke or meshBranches reach HQ services by default; direct branch-to-branch paths added only where the business needs them.
Dual-egress redundancyTwo paths per critical site — second broadband or a 4G/5G SIM — with automatic failover in seconds and fail-back when the line heals.
Template-driven rolloutBranch configs are stamped from one reviewed template and pushed centrally — a new site comes online in hours, not weeks.
Critical apps firstQoS marks POS, ERP and voice ahead of downloads and video — the till never waits behind a software update.
SD-WAN upgrade pathThe same router categories grow into controller-driven SD-WAN with per-application path selection — you evolve, not rebuild.

Three Fleet Sizes, One Design Logic

The branch count changes the headquarters end far more than the branch end — that is where the tiers differ:

Numbers we design around:
Encrypted throughput per branch: POS + cloud apps typically need 10–50 Mbps sustained
Failover target: seconds, not minutes — dual egress with automatic health checks
Addressing: one non-overlapping subnet plan across all sites, written down before router one ships
Fleet sizeTypical businessWhat the design includes
3 branchesStartup chain · clinic group · trading firm with depotOne VPN gateway at HQ, one VPN router per branch, hub-and-spoke tunnels, a written addressing plan — simple, documented, done in days.
10 branchesRegional retail chain · restaurant group · distribution networkDual links at HQ, config template per branch type, dual egress at the sites that trade, link monitoring with alerts to HQ IT.
50 branchesNational chain · franchise fleet · bank-style branch networkRedundant hub pair at HQ, centralized config push and monitoring, per-application QoS policy, phased rollout plan — and this is the tier where controller-driven SD-WAN starts paying for itself.

Equipment Roles (Categories, Not Models)

The solution is built from these equipment categories — the brand is chosen with you at design stage. Exact models depend on branch bandwidth, encrypted-throughput needs and destination country — so we spec models after your requirements list, not before.

RoleWhat it does
Branch VPN routersTerminate the broadband, build the IPSec tunnel to HQ, run local NAT and QoS — one box per branch, stamped from the template.
HQ VPN gateway / firewallThe hub: terminates all branch tunnels, enforces which branch traffic may reach which HQ resource, sized by total encrypted throughput.
4G/5G backup linkA SIM-based second path at sites that must keep trading — the router fails over to it automatically when the wired line drops.
Branch PoE switchConnects and powers POS, cameras, APs and phones inside each branch — one closet, one switch, one cable type.
Branch Wi-Fi APStaff and customer Wi-Fi on separate VLANs — guest traffic goes straight to the internet, never into the company tunnel.
Central managementTunnel state, link quality and configuration for every site on one screen at HQ — with config backup, so no branch depends on one person's memory.

Send us your requirements list — branch cities, headcounts, what each site runs — and the model list follows. That order keeps the design honest.

Design Notes & Honest Limits

Read this before you commit:
  • A VPN over the internet inherits the internet's quality. Latency and jitter follow your local ISPs — for hard real-time SLAs between two fixed sites, an honest engineer sometimes still recommends a leased line. We will tell you which case you are.
  • Encrypted throughput is well below the router's headline number. IPSec costs CPU — we size every box by its encrypted throughput at your packet sizes, not by the datasheet's best case.
  • Licensing policy and product availability differ by brand and destination country. We check and confirm both for your country at the design stage — before you commit to anything.
  • Some countries regulate VPN use and encrypted traffic. Cross-border tunnels can also cross legal regimes — check the rules where your branches sit; we flag what we know at design stage, but your counsel has the final word.
  • With only two sites, a simple site-to-site tunnel between two routers is enough — you do not need this whole architecture, and we will say so.

FAQ

Do my branches need static IP addresses?
No. Branches can sit behind ordinary dynamic broadband — only the headquarters end needs one reachable address (a static IP or a DDNS name). Branch routers dial the tunnel toward headquarters, so dynamic addresses at the stores are fine.
Is a VPN over the public internet safe enough for POS and ERP data?
The tunnels are encrypted end to end with standard IPSec (AES), the same technology banks use between offices. What travels the public internet is ciphertext. We also segment branch traffic so a compromised store PC cannot roam the whole company network. Formal compliance requirements per industry and country are confirmed at design stage.
What happens when a branch loses its main internet line?
With dual egress the router fails over automatically to the second path — a second broadband line or a 4G/5G SIM — typically within seconds, and fails back when the main line recovers. The POS keeps trading; staff usually never notice.
Can we add new branches later without touching headquarters?
Yes. The headquarters hub is designed once with headroom; each new branch is a copy of a configuration template on a new router. At larger fleets, configurations are pushed centrally so a new site comes online in hours, not weeks.
Do I need SD-WAN, or is plain IPSec enough?
Honest answer: below roughly ten branches with ordinary cloud and POS traffic, well-designed IPSec with dual egress is usually enough. SD-WAN earns its cost when you have many sites, multiple links per site and applications that need per-app path selection. The hardware categories we design with support the upgrade path, so you are not locked out later.

Send us your branch list — cities, headcounts, what each site runs

An engineer replies with a hub-and-spoke design, an addressing plan and the equipment-category list. Send us your requirements list — the model list follows.

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