Connect two firewalls with one Cisco Router

Hi,
I am using one Cisoc router 1800 and one Sonicwall Firewall in my Network.
For accessing the internet and other web related services i am using Internet Lease line.

Now, I want to setup a new network wihich will be completely isolated from the current network but will use the same Internet Lease line.
The new setup will use the separate dedicated firewall for internet and NAT purpose.

My question is, Can i connect the new firewall with the cisco router?
As my Cisco router have two fast eithernet port out of which one is being used by existing firewall and second one i will use for the second firewall.

Is it possible if i give public ip address to my external interface of new firewall as well as internal interface of router and start doing all the NATing in the firewall to map the servers and other things.
(This i am already doing in my existing firewall)

will this be the good solution? if not what should be the ideal solution.
sanjeevkmrsAsked:
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gvalsekCommented:
since I believe you have a single public IP pool (I suppose with mask /29), you can also keep both firewall on the same FE interface, assigning them 2 different public addresses.
Example:
Network: 200.200.200.200/29
Router FastEthernet: 200.200.200.201
1st firewall: 200.200.200.202
2nd firewall: 200.200.200.203
You can use all other IP addresses to publish internal hosts, NATing them on the outside IF of the 2 firewalls.
On the inside of the firewall you can obviously use private IP, as you like (even the same network addresses)
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rxhangoCommented:
Can you post a scheme of actual network and how you would like it to be?
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sanjeevkmrsAuthor Commented:
Thnaks for the Help.
This means its possible to use one bunch of  public IP for 1st firewall and one for 2nd firewall and both will have separate connection even for VPN tunneling.
But is it possible to establish the communication between these two network behind the firewall.
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gvalsekCommented:
if you connect both inside interfaces of the two firewall on the same switch, without VLAN, you can communicate from one lan to the other, without passing through firewalls

I would prefer to keep separate lans and manage traffic assigning rules on the two firewall, to have more control on the traffic itself
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sanjeevkmrsAuthor Commented:
Fortunately, I am not going to connect both the firewall to same switch. Switches will be separate for both the firewalls.
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gvalsekCommented:
so you must create rules on both firewall to allow traffic from the first one to the other one
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sanjeevkmrsAuthor Commented:
Thanks a lot for your Help.
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