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NAT is a 1st step. You should also set the Firewall.
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NAT is a 1st step. You should also set the Firewall.

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I've created the Security Policy as well
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I have a problem setting up a NAT Virtual Server on a Zyxel ZyWALL 110, I must be doing something stupid but I've stared at this for so long I just can't see it. <br />
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I'm simply trying to re-direct Wan1 &gt;&nbsp;Internal IP as show in the attached.<br />
<a href="https://filedb.experts-exchange.com/incoming/2020/03_w13/1447662/NAT.jpg" target="_blank" class="file-inline" title="JPG of Virtual Server config (227 KB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>NAT.jpg</a>
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NAT.jpg

I have a problem setting up a NAT Virtual Server on a Zyxel ZyWALL 110, I must be doing something stupid but I've stared at this for so long I just can't see it. 

I'm simply trying to re-direct Wan1 > Internal IP as show in the attached.

Zyxel ZyWALL 110 - HELP

Hardware-based firewalls provide more sophisticated protection for inbound and outbound traffic than the simple Windows software firewall or the basic NAT firewalls found in routers. These devices implement techniques such as stateful packet inspection, deep packet inspection, and content filtering; and may include built-in antivirus and anti-malware protection.