ASA / Pix OS7 in Transparent Mode.

Hi All

I was wondering if anyone can help me with the following. I have Cisco asa 5520 firewall and would like to configure it as a transparent firewall (never done this before but have setup pix firewalls in routed mode). I want to firewall 2 servers. Therefore I was thinking that I would buy a new switch plug the servers into the new switch, 1 leg of the firewall into the new switch and 1 leg of the firewall into the old switch to link them together. Does anyone see any problems with this? The reason for this is I can't change the IP address of the servers but they need to be behind a firewall for security reasons.

In addition if anyone has any sample configs of an asa or pix os7 in transparent mode please could you post it?

Thanks
LVL 2
billythehamsterAsked:
Who is Participating?
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.

lrmooreCommented:
Here's information on setting it up in transparent mode. Notice that you must specify access-lists on both interfaces,  not just one as in a normal config.
http://www.cisco.com/univercd/cc/td/doc/product/multisec/asa_sw/v_70/config/fwmode.htm#wp1202700
0
billythehamsterAuthor Commented:
I have followed those instructions however I seem to be having trouble passing traffic. I have done the following:

1. configured transparency mode
2. set the interface names
3. issued a no shut command on each of the 2 interfaces
4. set the global management ip address
5. created an access list to permit icmp for the relevant networks
6. applied the access list to the inside and outside interface

Did I read somewhere that each interface needs to be in its own VLAN? If so how do I do this?

0
lrmooreCommented:
>Did I read somewhere that each interface needs to be in its own VLAN? If so how do I do this?
That only depends on how you have it physically connected to the LAN switch. Do both interfaces connect to the same switch? If yes, then they need to be in separate vlans. If no, then you should have two switches, one on either side of the firewall. No vlans needed then.
Try creating acls to allow 'ip' for the initial testing
 access-list 101 permit ip any any
 access-list 102 permit ip any any
 access-group 101 in interface inside
 access-group 102 in interface outside
0

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
billythehamsterAuthor Commented:
Just got it working - it turns out that there was a typo in my access-list. Thanks for you help and I will remember the VLAN tips. This transparent firewall stuff is very clever.
0
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
Cisco

From novice to tech pro — start learning today.