The BGP daemon's command line — the next port up from ospfd on an FRR router.
2605 is BGP_VTY_PORT in FRRouting: bgpd's own telnet-style management CLI, separate from every other daemon's. Anyone who gets past its password can read the full BGP table and change neighbors, policy, and redistribution on a live router. It shows up on Linux route servers and reflectors, and on FRR-based network appliances. IANA has 2605 registered as "NSC POSA", unrelated to routing.
Do not expose
This is the routing control plane over cleartext telnet — internet exposure hands over the router's BGP configuration.
$ nc -v -w 3 TARGET 2605Seen this on your network? Beige Box scans your Wi-Fi and shows every open port on every device — and its Ports tool links straight back here.
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Corrections or a missing port? Reply @rimrocksystems.