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Did not resolve my issue but may be of use to others 
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Did not resolve my issue but may be of use to others

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Hi <br />
we are trying to configure a VPN tunnel between our office in the uk which is using a sonicwall TZ series firewall and our office in houston which is using a Cisco 2851 Router, and a Cisco ASA, <br />
<br />
the VPN tunnels are all showing as up, however no traffic is able to pass between the sites, is there anything we are missing when setting this up?<br />
<br />
<br />
Regards<br />
<br />
Andy<br />

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Hi 
we are trying to configure a VPN tunnel between our office in the uk which is using a sonicwall TZ series firewall and our office in houston which is using a Cisco 2851 Router, and a Cisco ASA, 

the VPN tunnels are all showing as up, however no traffic is able to pass between the sites, is there anything we are missing when setting this up?


Regards

Andy


VPN Between Sonicwall and Cisco 2851

A virtual private network (VPN) is a network that uses a public telecommunication infrastructure, such as the Internet, to provide remote offices or travelling users access to a central organizational network securely. VPNs encapsulate data transfers using secure cryptographic methods and other security mechanisms to ensure that only authorized users can access the network and that the data cannot be intercepted.

A router is a networking device that forwards data packets between computer networks. Routers perform the "traffic directing" functions on the Internet. The most familiar type of routers are home and small office cable or DSL routers that simply pass data, such as web pages, email, IM, and videos between computers and the Internet. More sophisticated routers, such as enterprise routers, connect large business or ISP networks up to the powerful core routers that forward data at high speed along the optical fiber lines of the Internet backbone. Though routers are typically dedicated hardware devices, use of software-based routers has grown increasingly common.

Routers

Hardware-based firewalls provide more sophisticated protection for inbound and outbound traffic than the simple Windows software firewall or the basic NAT firewalls found in routers. These devices implement techniques such as stateful packet inspection, deep packet inspection, and content filtering; and may include built-in antivirus and anti-malware protection.