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I am working on creating a IPSEC VPN Tunnel between two buildings that are 300-400 yards away. &nbsp; This was up and running with no problems for a few months. &nbsp;Then all of sudden we lost communication. &nbsp; I tested communication to each device from a third party and had no issues establishing the connection. &nbsp;I have reset each device to factory defaults. &nbsp; updated all firmware but still unable to ping IP on remote site. &nbsp;The IPSEC tunnel is opened between building A and B but unable to ping any IP address either way. &nbsp;<br />
Any ideas are welcome
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I am working on creating a IPSEC VPN Tunnel between two buildings that are 300-400 yards away.   This was up and running with no problems for a few months.  Then all of sudden we lost communication.   I tested communication to each device from a third party and had no issues establishing the connection.  I have reset each device to factory defaults.   updated all firmware but still unable to ping IP on remote site.  The IPSEC tunnel is opened between building A and B but unable to ping any IP address either way.  
Any ideas are welcome

FVS318G IPSEC VPN Tunnel

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

Networking software modules are interfaced with a framework implemented on the machine's operating system that implements the networking functionality of the operating system. The best known frameworks are the TCP/IP model and the OSI model. Systems typically do not use a single protocol to handle a transmission. Instead they use a set of cooperating protocols, sometimes called a protocol family or protocol suite.[9] Some of the best known protocol suites include: IPX/SPX, X.25, AX.25, AppleTalk and TCP/IP. Other protocols indirectly related to networking include the hypertext transfer protocol (HTTP) and its related technologies, Dynamic Host Configuration Protocol (DHCP), Domain Name Server (DNS) and other Internet protocols.