Worked on the DragonBluep/openwrt repository to deliver a targeted fix addressing VLAN-tagged frame drops caused by miscalculated MTU values. Focused on Linux kernel development and embedded systems, the solution involved updating MTU configuration logic in C to include the VLAN header length in both PPE egress and WAN MTU registers. This hardware-aware adjustment aligned the MTU with the device’s Layer 2 overhead, preventing valid VLAN-tagged frames from being dropped. The patch improved VLAN traffic reliability and WAN throughput in VLAN-enabled environments, with changes documented and traceable through a dedicated pull request and commit for review and future reference.