Site to Site VPN Routing Explained


A site-to-site (VPN) is a connection amongst two or more networks, such as a corporate network and a branch agency network. Many organizations use site-to-site VPNs to influence an internet connection for private traffic as a substitute to using individual MPLS circuits.

Companies often use Site-to-site VPNs with numerous offices in different physical locations that need to access and use the company network regularly. With a site-to-site VPN, a company can strongly connect its corporate network with its remote offices to link and share resources with them as a single network. Companies can look at Reddit to get the best VPN deals.

At times site to site VPNs are confused for remote access VPNs while, in reality, these two are different. Remote-access VPNs are a temporary connection between users and headquarters, typically used for access to data center applications.

How It Works

With a site-to-site VPN, these channels go from one location to another, and the only people who can see the data being moved are users registered on the network. The VPN uses doorways at each location, which encodes all traffic that passes through.

All traffic has to be validated at the gateway, which is only responsible for protecting the data and transporting it through the tunnel to the other side.

When incoming traffic is received, it is decoded, and data packets are sent on to the target host, such as a worker receiving sensitive information about clients.

Types of Site to Site VPN

Intranet Based

If a company has one or more distant locations that they’d like to join in a sole private network, they can create an intranet VPN to link each separate LAN to a single WAN.

Extranet Based

When a business has a close relationship with another activity (such as a supplier, partner, or customer), it can earmark an extranet VPN that links those companies’ LANs. This extranet VPN lets the companies work together in a secure, shared network setting while preventing access to their distinct intranets.

Even though the resolve of a site-to-site VPN is unlike that of a remote-access VPN, it could use some of the same equipment and software. Ideally, though, a site-to-site VPN should eradicate the need for each computer to run VPN client software like it’s on a remote-access VPN.

Techniques for Establishing Site to Site VPNs

Internet-Based Site-to-Site VPN

The cyberspace VPN method uses a company’s prevailing network, together with the public internet infrastructure. To set up an internet-based site-to-site VPN amongst two sites, a VPN gateway (router, VPN concentrators, firewall, or security appliance) such as the Cisco Adaptive Security Appliance (ASA) is needed at both sites.

MPLS Site-to-Site VPN

While internet site-to-site VPNs have existed for many years, MPLS is a fairly new method of establishing a site-to-site VPN. In this technique, the VPN connection is established by linking to a carrier-provided MPLS cloud, rather than to public internet.

Thus, an MPLS VPN uses apparatus belonging to the VPN provider, not the corporation utilizing the VPN. To configure an MPLS VPN, a business security solutions provider creates virtual connections between the client business’s office sites across the provider’s own MPLS network.

Benefits of Site-to-Site VPN

Operational Efficiency

Because handlers don’t have to have client applications fitted on any of their devices, using a site-to-site offers ease-of-use breaks for businesses. Employees have to be logged on to the work network as they usually would, and the gateway takes care of the rest.

Water-Tight Network

When a business exploits a site-to-site VPN across its operations, it can assume a far more secure equilibrium as far as their data is concerned. Business executives are concerned about the increase of cyberattacks, and a newfound predisposition from hackers to target SMBs should concern them.

Using a VPN will guarantee them peace of mind, safe in the knowledge that data can be moved between different locations without being worried about a breach.


One of the principal benefits of executing a site-to-site VPN for a business is its scalability. If you open a new office, it’s easy to add them to the WAN. You won’t have to individually get each device under network up and running.


To sum it all up, if your business is small with little data sharing outside of your sites, then it’s improbable that a site-to-site VPN will be necessary. However, if you’re a growing company that has ambitions to grow into a larger organization in various locations, then a site-to-site VPN would be a practical investment.

Anik is an IT professional and Data Science Enthusiast. He loves to spend a lot of time testing and reviewing the latest gadgets and software. He likes all things tech and his passion for smartphones is only matched by his passion for Sci-Fi TV Series.