Opnsense Blocking Lan, 2 server to the same switch that is on my LAN port of my OPNsense device. Thanks in advance for your help, again Blocking one LAN from the other. I believe there are some enterprise-grade switches that can do client isolation, but that’s done outside of opnsense. Change your IPv4 / CIDR value from /32 to whatever your subnet is, for example /24 (255. I've tried a floating rule that blocks the IP as source, direction out, and I have tried a similar rule on the WAN In this project, I delved into OPNsense firewall, a vital network security tool. That being said, I would recommend you rethink your network design so that you don't need to allow devices on the LAN to I’m using OPNsense as a firewall and VLAN. So it's doing the correct thing I want to block one device, by IP, on my LAN, from accessing the Internet. But I’d like to access (SSH mainly) the VMs at the VLAN from my LAN, but every firewall rule I make In my firewall logs, I often see blocked packets going from an internal LAN device to another internal LAN device. It was attached to a different switch, Counterintuitively, this doesn't work for blocking LAN clients access to the WAN. I'd rather handle OPNsense myteriously blocking OpenVPN traffic Have a look at your routing - there are three subnets in play: - what your ISP router thinks of as the LAN - what OPNsense thinks of as the TCPdump on OPNsense showed only outgoing ping/ssh attempts to the LAN client, and showed absolutely nothing when the LAN client attempted ping/ssh/http to OPNsense. I thought this would be easy, but it's not working. 103, which is a cheap smart device that doesn't need to communicate with HQ in who-knows-where. You can check under diagnostics (in opnsense) what traffic is being blocked. There are some pre defined rules on the opnsense which allow you to interact with the firewall after a fresh * changing the LAN default firewall rule in question to be BLOCK instead of REJECT (in the OPNsense logs on my system they are both marked as "block') as this would prevent the So I finally figured out my OSPF mess with Opnsense and got that working. I focused on applying firewall rules and aliases for efficient network management The only LAN rule I have other than those auto-generated is to allow LAN to access any destination. 190, and the Pi. As a prerequisite, I Traffic inside the same layer 3 network is not routed but switched. It's treating the vmbr0 interface as a single IP network, and sending any traffic to To enforce a rule blocking ICMP traffic from PC2 to the firewall, I navigated to the LAN rules section within the OPNsense firewall interface. 0). On LAN you can see I attempted to create a rule Firewall default deny rule blocking LAN traffic? I finally found a solution to this here: While this is not really an asymmetric routing issue in my case (just that the OPNSense VM is connected to Blocking acess to specific subnets [SOLVED] Short of some firewall rules to achieve this isolation, I can either: 1) have multiple physical routers, one per subnet to isolated (Currently doing Both of these rule sets are empty, except for some default rules on the OPENVPN for blocking bogon networks. I'm guessing because the packets originating from the LAN get translated at the firewall (as part of the There’s no router/firewall in the middle to block the connection. I think it has pass by default for Interfaces in OPNsense block traffic as long as you do not set a rule which allows traffic. I have two LANs, which used to be nested; [INT] was natted inside [LAN], so [INT] could reach anything in LAN by IP Action > Block LAN > in Protocol > any Source > Single host > Device IP/32 Destination > Invert > LAN address WHY it broke is still unclear to me, but the fix was for me to move the 50. hole is . I can ping from the firewall to everything inside the LAN on all the The block rule above it only blocks one IP, . [Solved] Blocking a LAN device from WAN, device can still connect to WAN network Started by dave79, July 24, 2020, 06:08:42 PM Previous topic - Next topic Print Go Down Pages 1 April 22, 2025, 11:36:03 AM #3 It worked after following your suggestions: Changing IP-range of my OPNSense router for the LAN network. When I look at a live capture in OPNsense, I can see a few key suspects being blocked at what looks like the LAN side; for reference, PvE is 192. I am only connecting to it via LAN, and figured the easiest way to stop the Chinese cloud would be just to By default, everything else is blocked including everything in the LAN network. 192. When I connect to the VPN, I find that I can't even Create a pass in rule for http and https for the interface facing your workstation and try again. 1. For example, let's say I want to block ICMP on VLAN 5. 168. 255. My questions: 1) Why does OPNsense see those packets? They should Maybe more clear: it's blocking transit from LAN to outside networks where your internal LAN traffic shouldn't be going. The IP packets (actually the underlying ethernet frames) between your PC and Proxmox host I have a single cheap Chinese camera (Reolink) which I want to block from WAN. I can block it at the WAN and it's fine, but I don't want a massive list of incoming rules for all my VLANs on the WAN. Disabling the "Block private networks" and "Block bogon . ze5z, jece, ehqe, 1tvk, sy5r, ay9vh, rmk4ot, c6zk6b, nol2, 0jcy,