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OPNsense Transparent Filtering Bridge (v26.1) (Part 1)

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About OPNsense Transparent Filtering Bridge (v26.1) (Part 1)

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In this Part 1 guide, I will be configuring OPNsense in a transparent bridge configuration for OPNsense 26.1 (should also work for 26.7 but you don't need to migrate firewall rules when starting fresh with 26.7). When OPNsense is configured as a transparent filtering bridge, you are using OPNsense only as a firewall instead of a router and a firewall. Once the transparent filtering bridge is configured, you can insert it in between any two wired devices on your network: between the modem and router, between the router and network switch, or between the network switch and a server. Essentially you can put it anywhere you desire a dedicated firewall appliance. In this example, I will be placing the transparent filtering bridge between the router and the core/aggregation switch for my home network. This will give me more internal network visibility than placing it between the modem and router. However, one downside is that the filtering bridge can be detrimental to throughput if you are using a lower powered hardware. For instance, I am using the Gowin R86S-G4 which has the Intel N6005 CPU. Performance for routing across VLANs dropped from 9.4 Gbps (full 10 Gbps throughput) to about 7.5-8 Gbps. The performance drop is not a dealbreaker for me because I don't route a lot of fully saturated 10 Gbps traffic through the firewall since I have a dedicated backend 10 Gbps VLAN used for most of my high bandwidth NAS traffic. Even if I did route all the NAS traffic through the firewall, I am typically capped between 2.5-3.5 Gbps since I'm using traditional 3.5" hard disks for my bulk storage. For a written version, please visit my website: https://homenetworkguy.com/how-to/configure-opnsense-transparent-filtering-bridge/ Chapters: 02:34 Connecting PC to MGMT interface 02:45 Setting up the OPNsense transparent filtering bridge 03:46 Change LAN to be MGMT 05:22 Configure gateway for MGMT 06:29 Note about DNS configuration 07:41 Firewall rules for MGMT interface 11:55 Configure interfaces to be used in bridge 13:59 Disable outbound NAT 14:23 Update system tunables 15:49 Create the bridge interface 17:03 Create firewall rule for the bridge 18:25 Disable DHCP on MGMT interface 19:22 Connect transparent filtering bridge to main network 20:10 Testing updating OPNsense 21:19 Optional: install plugins 22:34 Testing access on filtering bridge 22:58 Speed test 23:46 Testing a firewall block on bridge EP97 Join this channel to get access to perks: https://www.youtube.com/channel/UCvdHQkQv8KpwMnKkitmUVTQ/join

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