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SITE A: 
 
Sonicwall TZ-215 
Public WAN IP: 123.X.X.X 
LAN IP: 10.30.0.0 / 255.255.255.0 
 
This device is configured to allow VPN connections via L2TP. It places VPN connected machines on the 10.30.2.0 network. 
 
SITE B: 
 
Sonicwall TZ-215 
Public WAN IP: 456.X.X.X 
LAN IP: 10.30.1.0 / 255.255.255.0 
 
 
Site A can hit Site B, but devices connected to Site A's L2TP VPN can hit devices on all of Site A's subnets but cannot hit Site B. 
 
Site B can hit Site A but cannot hit devices on the L2TP VPN. 
 
Any insight or places to look would be great. I've played with the access rules left and right on both firewalls but am just not having any luck!
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SITE A:

Sonicwall TZ-215
Public WAN IP: 123.X.X.X
LAN IP: 10.30.0.0 / 255.255.255.0

This device is configured to allow VPN connections via L2TP. It places VPN connected machines on the 10.30.2.0 network.

SITE B:

Sonicwall TZ-215
Public WAN IP: 456.X.X.X
LAN IP: 10.30.1.0 / 255.255.255.0


Site A can hit Site B, but devices connected to Site A's L2TP VPN can hit devices on all of Site A's subnets but cannot hit Site B.

Site B can hit Site A but cannot hit devices on the L2TP VPN.

Any insight or places to look would be great. I've played with the access rules left and right on both firewalls but am just not having any luck!

When connected to a Sonicwall via VPN, cannot hit devices connected to a second Sonicwall (Site to Site)

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.

Hardware Firewalls

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.

Networking is the process of connecting computing devices, peripherals and terminals together through a system that uses wiring, cabling or radio waves that enable their users to communicate, share information and interact over distances. Often associated are issues regarding operating systems, hardware and equipment, cloud and virtual networking, protocols, architecture, storage and management.