Greetings Daniel and thanks a lot for the reply. I got it! So if I create my VLAN on the L2 switch and plug in (cascading) to a L3 switch that we will probably buy (thinking about Dell X1026), I will be able to separate the VLANs on L2 switch (servers, printers, pcs, AP, ...) and all of them can communicate with my main AD W2k12 server that will be on another VLAN, thanks to L3 switch, currect? I'm wondering to deploy something like this: Layer 2 Sw (8 VLANs) >> Layer 3 Sw (Routing) >> PfSense Appliance >> router/gateway >> ISP. Is this even possible? If so, the cascading between the L2 and L3, needs to be 10Gbps? I'm preety sure that the PowerConnect 2724 does not support this throughput (or even cascading at all, cause it is too old). Thanks
Greetings all, my company has an old PowerConnect 2724 switch and I'm passing the last month stuck in a odd situation: I want to create three VLANs for security purposes, with 1 specific port (of my ISP Fiber Access Point, say port 23) being shared in 2 VLANs. He is what I did: Setted PVID of port 6 as VLAN 3, PVID of port 23 as VLAN 2 as the other ports (except port 17). With this, as expected, no one PCs of VLAN 2 can ping my secure PC (port 6) however, at my VLAN 3, from the secure PC I can't ping any host of the internet (no internet) and also, cannot ping my servers and printers.  At this points I have tried almost everything and read a lot of in internet: Set Untage instead of Tagged on ISP Port and server / printers. Set Allowed Tag Only, Allowed All, Not filtering, ... So at the end of the day (month in my case) I truly miss my CISCO switch however the company will not buy new ones just because I can't set a VLAN.. My bad or Dells bad? Any help? 
Unable to share port between VLANs on old PowerConnect 2724