TL-ER6020 doesn't support VLAN multiple IP Interfaces, but it support Multi-Net NAT, so it will know about several subnets on LAN side. Just configure routing on switch, as it was said above and add...

Yeah, you can't ping on the other side of NAT. That is why you use one-to-one NAT. You should be able to fully control your 192.168.1.107 by using 10.10.10.2 instead.

My thoughts. TL-ER6020 v2/v3 doesn't support telnet, so it can't be used, so it is closed, not stealth. TL-ER6020 v1 supports telnet, so it will be stealth.

Check the speed of your connection properties on PC. I bet it is not 1Gbps, but 100Mbps, so your network card support 100M maximum speed. Btw, how is it fiber, if tl-er5120 doesn't have SFP ports? Do...

You mean IP-address, not FQDN? Yes, it supports public IP-address on both sides. TL-ER6120 is the maximum from TP-Link.

For example, you have a router at home and your ISP provide you TV, IP-Phone and Internet. ISP told you to configure VLANs for IP-Phone and TV, so you need to configure VLAN 10 for IP-Phone and VLAN...