Connect two firewalls with one Cisco Router

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.
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

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.
Router FastEthernet:
1st firewall:
2nd firewall:
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)
Can you post a scheme of actual network and how you would like it to be?
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.
Turn Raw Data into a Real Career

There’s a growing demand for qualified analysts who can make sense of Big Data. With an MS in Data Analytics, you can become the data mining, management, mapping, and munging expert that today’s leading corporations desperately need.

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
sanjeevkmrsAuthor Commented:
Fortunately, I am not going to connect both the firewall to same switch. Switches will be separate for both the firewalls.
so you must create rules on both firewall to allow traffic from the first one to the other one

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
sanjeevkmrsAuthor Commented:
Thanks a lot for your Help.
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today

From novice to tech pro — start learning today.