Tuesday, April 16, 2019

Switch - How to block a Subnet from propagating through a specific port ?

Is there a way to stop a specific subnet/Vlan from propagating through a specific port on a "smart managed" switch ?

Let me backup:

I have just inherited a project, that is totally out of my wheelhouse (I typically do Systemadministration on virtual servers and their hosts).

Basically they are trying to provide 3 Wifi networks through 8 Ubiquity AP's to a campus using 3 separate ISP's (that come with their own modems and DHCP-Servers). They also would like to push a "internal WIFI" that is governed by a Windows DC. A 'VAR' was contacted and sold them a Zyxel GS-1920-24. Then the project was delayed a couple of times and 2+ years down the line the employee was let go. Queue me.

So basically, Is there a way to set a port on the switch to only:

  • Allow a specific subnet/Vlan
  • Block all other subnets/Vlan

or another option to get this done without having to buy additional hardware?



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