Configuring UTM to provide two subnets on one port connection using vlans.

To date I have created subnets on my UTM with ports connected to a managed switch.  All the heavy lifting such as dhcp, dns etc is done by the UTM which connect to access ports for each subnet on the switch.   All the vlan work to manage the subnets is then done on the switch. 

I have 5 available ports on the UTM and now need six subnets and so I run out of ports on the UTM.  I need to connect six subnets to 5 ports. 

I think what I want to do is create two vlans on the UTM and assign the two subnets to these vlans with dhcp and dns associated.  What I am not sure about is how to get the traffic through the one port and land it on the switch.   Please could I have some help doing this on the UTM and how to deal with tagged traffic from UTM on the switch.

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  • Just select the same hardware interface (in my example eth4), with 2 different VLANs on the same port. That means 2 interfaces for 2 subnets with the corresponding VLAN.
    The rest has to be done in your switch. It depends a little on the vendor of your switch. Something like trunk or general mode sounds correct for me.

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  • Hi and many thanks.  All good now.  The switch accepts the connection with T-agged configuration on the port and then the vlan traffic is routed as usual within the switch.  I had been worried about the UTM-switch interface but all painless, just not clearly documented.