Seamless Incorporation; Transparent Firewall - ZyXEL Communications ZYWALL 1050 Support Notes

3. Seamless Incorporation

With its robust networking functionalities, ZyWALL 1050/ZyWALL USG 300 is easy to
integrate into existing network infrastructure. You can easily implement the following
applications. They are "Transparent firewall", "Transparent IDP" and "Network Partitioning
using VLAN".

3.1 Transparent Firewall

With transparent firewall, you do not need to change the IP addressing scheme of your
existing network topology. What you need to do is to insert ZyWALL 1050/ZyWALL USG
300 into your existing network environment. Bridge the ports you think that need to be
included in this bridge interface. Apply the security policies that you want. And that will be it.
Moreover, ZyWALL 1050/ZyWALL USG 300 supports working as bridge mode and router
mode at the same time; which means that they can co-exist.
3.1.1 Bridge mode & Router (NAT) mode co-exist
Here is an example:
DMZ and WAN zone can be bridged so that servers in the DMZ zone can keep using the same
public IP address (as those in WAN zone) for effortless IP management. IP addressing in LAN
zone is private IP segments. Thus, we need NAT, which is the router mode here. In our
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