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ASA / Pix OS7 in Transparent Mode.

Posted on 2007-03-22
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Last Modified: 2010-09-16
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
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Question by:billythehamster
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by:lrmoore
ID: 18770520
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
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by:billythehamster
ID: 18771293
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?

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lrmoore earned 2000 total points
ID: 18771325
>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
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Author Comment

by:billythehamster
ID: 18771438
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.
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