The contents of the frame are irrelevant, it could be an ICMP (ping) packet, it could be an ARP packet, or it could be other data. It starts with Host A having a frame to deliver to Host B.
Port 3 on the blue switch is connected to port 4 on the green switch. Host B and D are connected to ports 5 and 6 of the green switch on the right. Host A and C are connected to ports 1 and 2 of the blue switch on the left. Our topology has two switches, and each has their own, independent MAC address table - the information in the MAC address tables are never shared. We will illustrate how data moves between multiple switches using the following topology: The process does not change, it is simply replicated separately by other switches. With multiple switches, each switch will still independently perform the exact same four functions. In the Packet Traveling series, we discussed the four specific functions of a switch: Learning, Flooding, Forwarding, and Filtering we then illustrated each function in an animation that showed two hosts communicating through a single switch. This article will illustrate the process using two switches. One of the most frequent requests I receive is asking how the process would be different if there were multiple switches. It is suggested to create additional connection from the LTE router to the host for configuration purposes.įor example vlan interface between the LTE router and host.In a previous article we demonstrated how a single switch functions.
Note, that it will not be possible to connect to the LTE router via public lte ip address or from the host which is used by the passthrough. On the host on the network where the Passthrough is providing the IP a DHCP-Client should be enabled on that interface to. If there are multiple hosts on the network it is possible to lock the Passthrough to a specific MAC. Router will automatically detect MAC address of the first received packet and use it for the Passthrough. Some modems support multiple APN where you can pass the traffic from each APN to a specific router interface. The LTE Passthrough modem can pass both IPv4 and IPv6 addresses if that is supported by modem. In this configuration the router will not get IP configuration from the modem. In this case modem firmware is responsible for the IP configuration and router is used only to configure modem settings - APN, Network Technologies and IP-Type. Starting from RouterOS v6.41 some LTE interfaces support LTE Passthrough feature where the IP configuration is applied directly to the client device. The device's management interface becomes inaccessible from the “bridged” router, but can be still accessed from another device in the same subnet. Tested and working on a “LHG LTE kit” device in 12 January 2021. Some vendors like Mikrotik are providing Half Bridge in their LTE/5G modem/routers where the user can set an interface or mac address to “bridge” the WAN IP on.įor Mikrotik this feature is called “Passthrough”. It is best to specify that you want to switch their device to bridge mode because you bought a new personal router, so that they don't confuse the two. Please note: device manufacturers can call “bridge mode” all sorts of things, like Wi-Fi bridging (using two wireless devices to connect two Ethernet networks) or access point mode, or whatever else. In many cases they have a remote connection and can do this configuration change for you (especially useful if you don't have access to the device).
MULTIPLE PASSTHROUGH MAC ADDRESS MANUAL
The procedure to do this differs quite dramatically so it's problematic to write down a tutorial, please follow the device's manual downloaded from the manufacturer's support site for your device.Īlso asking your ISP's customer support to help you is an option. This method relies on switching the current modem-router in bridge mode, or by buying a Ethernet modem that supports this mode.īridge mode is a special mode of operation where the current gateway/modem acts as a network bridge, forwarding all traffic to a downstream device.įirewall bridge mode support in OpenWrt is provided by the kmod-br-netfilter module.įor this to work, the gateway device must be switched to bridge mode from its own interface.