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Help to connect Sonicwall between two cisco routers

I have two cisco routers and I want to put sonicwall between them. My plan is below....

Cisco router 1921

1. Two VWIC3-2MFT-E1/T1 cards to bundle 4xT1.

2. Set int G0/0 ip address

3. Do ip route to routing with Cisco router 2901 and ISP

Cisco router 2901x

1. Set int G0/1 ip address to connect Cisco router 1921

2. Set int G0/0 for VLAN Connecting port and connect to Cisco Switch with VLAN setting up



     G0/0.3 native


3. Do ip route to routing with Cisco router 1921

4. Do router EIGRP to routing all VLANs

Now, I want to put Sonicwall TZ215 between two Cisco routers for firewall.

1. Set WAN X1 ip address ; GW to connect to Cisco router 1921 int G0/0

2. Set LAN X0 for Transparent Mode, so ip address and ip range Connect to Cisco router 2901x int G0/1

After I put Sonicwall between two routers, the internet is down. Therefore, can anyone help or teach me how to do it?

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