Firewall responsibility should fall within the security group, as should all other security devices. The security group should configure, test and maintain them. But life is not always that black and white. As devices take on an increasing number of functions, networking and security tasks are becoming more entwined than before.
Networking people are usually focused on making sure the company's resources are constantly up and running. Sometimes security interferes here, but for the right reasons. If you are having difficulties designating networking and security tasks when troubleshooting, then the networking people should diagnose the issue. If it is determined that a security setting is causing the problem, then the security people have to decide whether the rule or configuration has to stay in place or not. To get through the troubleshooting process, the networking people may discover the issue, but they should not make any changes that affect security.
Many times, what is functional for an enterprise conflicts with what is secure. When this dilemma occurs, a high-level manager should make the call. I have been in environments, for example, where management allows external IM to come and go through their perimeter devices. Management was made fully aware of the risks, and they accepted these risks in writing. Many other environments, however, will not allow external IM servers because management has decided that there is no business purpose for it and that they should avoid any risks. These decisions should all be a part of your company policies.
A bad habit that occurs in many companies is that people in the networking department might, for example, modify access controls lists, or some other security settings, because they think that they understand it enough to make these judgments. What many networking people do not realize is that this is not their job, and they do not want to be held liable for such decisions. There have been cases where a network engineer had changed an access control list, allowing sensitive data to leak through the newly opened port. Sometimes these decisions have such dramatic results that the company can get sued, put in the headlines and actually thrown out of business. Networking people should understand the liability and responsibility that comes along with making security decisions.
Networking and security teams should work together, but with structured boundaries. Security changes should be approved, tested and documented. If there are questions or discrepancies, review the policies and standards, and if they do not clear up any confusion, take the issue to higher management.
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