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what are OS platforms currently deployed at the offices? Windows, Linux or Mac OS X?
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what are OS platforms currently deployed at the offices? Windows, Linux or Mac OS X?

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This is not a free solution, but it's a low cost solution that works pretty well for IPsec site-to-site VPN tunnels. If you are comfortable with CLI commands, this will allow for mesh or star VPN topologies.<br />
<br />
<a href="http://www.ubnt.com/edgemax/edgerouter-lite/" rel="ugc">Ubiquiti EdgeRouter Lite ERLite-3</a><br />
<br />
<a href="http://www.amazon.com/EdgeRouter-ERLite-3-512MB-Ethernet-Router/dp/B00CPRVF5K/" rel="ugc">Amazon - EdgeRouter Lite ERLite-3</a>
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This is not a free solution, but it's a low cost solution that works pretty well for IPsec site-to-site VPN tunnels. If you are comfortable with CLI commands, this will allow for mesh or star VPN topologies.

Ubiquiti EdgeRouter Lite ERLite-3 [http://www.ubnt.com/edgemax/edgerouter-lite/]

Amazon - EdgeRouter Lite ERLite-3 [http://www.amazon.com/EdgeRouter-ERLite-3-512MB-Ethernet-Router/dp/B00CPRVF5K/]

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Thanks. &nbsp;OS is Windows.<br />
<br />
Best Regards<br />
Raghav.
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Thanks.  OS is Windows.

Best Regards
Raghav.

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MS VPN requires Servers on all sites, but that shouldn't be an issue. And you should be comfortable with setting it up. Other solutions need more effort. &nbsp;But indeed I recommend some hardware specially configured for VPN and routing, but that comes with expenses.<br />
There is also OpenVPN for free, but that's no walk in the park either.
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MS VPN requires Servers on all sites, but that shouldn't be an issue. And you should be comfortable with setting it up. Other solutions need more effort.  But indeed I recommend some hardware specially configured for VPN and routing, but that comes with expenses.
There is also OpenVPN for free, but that's no walk in the park either.

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Hello Experts,<br />
<br />
I am looking for a free or low cost working solution to connect 3-4 offices together. <br />
<br />
Internet connectivity is available across all the sites. Any suggestions would be greatly appreciated.<br />
<br />
Best Regards<br />
Raghav.
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Hello Experts,

I am looking for a free or low cost working solution to connect 3-4 offices together. 

Internet connectivity is available across all the sites. Any suggestions would be greatly appreciated.

Best Regards
Raghav.

Low cost VPN solution

Internet Protocol Security (IPsec) is a protocol suite for secure Internet Protocol (IP) communications by authenticating and encrypting each IP packet of a communication session. IPsec includes protocols for establishing mutual authentication between agents at the beginning of the session and negotiation of cryptographic keys to be used during the session. IPsec can be used in protecting data flows between a pair of hosts (host-to-host), between a pair of security gateways (network-to-network), or between a security gateway and a host (network-to-host). IPsec is an end-to-end security scheme operating in the Internet Layer of the Internet Protocol Suite.

Internet Protocol Security

The Windows operating systems have distinct methodologies for designing and implementing networks, and have specific systems to accomplish various networking processes, such as Exchange for email, Sharepoint for shared files and programs, and IIS for delivery of web pages. Microsoft also produces server technologies for networked database use, security and virtualization.

Windows Networking

Network security consists of the policies adopted to prevent and monitor authorized access, misuse, modification, or denial of a computer network and network-accessible resources. Network security involves the authorization of access to data in a network, and covers a variety of computer networks; conducting transactions and communications among businesses, government agencies and individuals. Networks can be private, such as within a company, and others which might be open to public access.