Learning about slightly more advanced networking with linux
summary
Linux can act as a full router: create VLANs with ip link add and tag up to 4096 VLAN IDs, assign addresses, and firewall between them; run userland routing daemons like bird to handle OSPF and BGP, using OSPF cost tuning (example: local link cost 10 vs expensive link 100) to prefer a nearer service IP and fail over across the costly link. Expect flexibility but lower wire‑speed performance versus ASIC‑based enterprise boxes.
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