I have a LAN A and LAN B, different subnets. A device "Da" in LAN A wants to send data to another device "Db" in LAN B. There is physical connection (Cat6) between L2 switches of LAN A and LAN B. However there is no router in this architecture. Can the device "Da" ping or send data to device "Db" in this architecture ? Would be thankful for an answer or guidance ... The LAN I am talking about is the Ethernet IP LAN, IPv4 network.
You can use a native VLAN for transmission of traffic in Your VLANs (LAN A and LAN B). A native VLAN is assigned to an 802.1Q trunk port. Trunk ports are the links between switches that support the transmission of traffic coming from many VLANs. Native VLAN must be configured as an unused VLAN, (different from VLAN 1(default VLAN) and other VLANs). You can create a trunk link between your L2 switches of LAN A and LAN B.
You can study for more information in the link https://www.networkacademy.io/ccna/ethernet/trunk-native-vlan .
First when we talk about VLAN hoping, you must know that it s related to L2 (switch) ... router or Layer 3 switch will be used just in normal communication scenario (that is not related to hopping). Your first task is to "convince" L2 switch that you are device capable to create trunk (sending BPDU) based on DTP protocol (I am familiar with cisco equipment) and to establish trunk. Trunk means that through trunk link switch will send data from every VLAN to you :). So Da should create trafic to Db in a way to perform tagging with VLAN ID where Db belongs. This frame will be send through trunk. Frame will arive to second switch he will read VLAN ID and pass frame to all ports that are associated with that VLAN and on all ports marked as trunk. Dd will send response, it will arive to switch. Switch will set VLAN ID (tag) to frame and forward to all ports that are associate with that VLAN and to all trunks...so response will arrive to your Db, but still there is problem if you want to communicate with Db ... why ... because Da willl detect that destination is in another subnet (same sa Db) and will set gateway MAC as destination MAC address, so Db will never process this request... there is option to send broadcast ... but this include additional modification.... so it easy to monitor traffic , but harder to communicate in common way... hope that this helped :)
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