"main firewall"

I did a little reading on perimeter network security and the same phrase kept coming up, our "main firewall" is XYZ. Does that mean companies will utilise more than one perimeter firewall? If so - why, why would you use more than 1? Is there a danger of the firewall settings conflicting with each other and thus the admin not knowing whats in place? I dont understand why people would need/utilise more than 1 firewall - albeit its not my area of expertese.
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pma111Asked:
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schmitty007Commented:
In a lot of cases they may be referring to is a design with High Availability. We have a HA set up and I constantly refer to our Primary device as "main".
Also we have several connections to the outside world one of which we route all of our internet traffic out of and the others we don't route anything other than traffic going to specific destinations / VPN connections and so on also you may have multiple circuits in different physical location. This was done for several reason based on physical location of the circuit(i.e. different buildings across our WAN), compliance issues and management requests.
When we talk about our firewall that handles our internet traffic internally or with outside resources we always refer to it as the "Main" firewall.

And most newer firewalls or Next generation firewalls can handle multiple rules for the same destinations/sources so as long as you manage your firewall rules properly rules shouldn't conflict although some admins can create a rule and unintentionally have that rule break something else. In this case though the admin should be able to figure out what part of the new rule has created the conflict and be more specific with the rule to correct the issue.
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