[SOLVED] Disable inter VLAN traffic

  • Hi guys,

    I've been using pfsense for a while (2.0.1-RELEASE) and i'm having issues configuring a vlan interface. I 've created a new interface with the vlan id 5 on the lan interface and i've assigned it ip address. The issue is that from a host on vlan 1 (192.168.10.x subnet) i can see a host on vlan5 (192.168.20.x) and vice versa.

    Making a traceroute i can see that packages are routed from pfsense to the other vlan. Does anybody knows how to disable this behaviour? I need traffic from both vlans being isolated for security reasons.

    Thanks in advance!

  • Create your firewall rules on the VLAN interfaces accordingly.

    If you are using private IPs in your VLANs and want to block traffic between them but allow all to the internet, two rules are sufficient.
    First create an alias containing the RFC1918 subnets: 10/8, 172.16/12 and 192.168/16.

    Create rules:
    1: Allow, Source: OPTx_subnet, Destination: OPTx_interface
    2: Allow, Source: OPTx_subnet, Destination: ! RFC1918_Alias (NOT the alias)

    These two rules:
    Ensure the devices connected to the pfSense can communicate with the pfSense
    Allow accecss anywhere except your local private subnets.

  • Thanks! I was able to isolate both vlans adding rules to the firewall.

Log in to reply