The zebra routing manager's telnet config shell on a Linux router running FRR or Quagga.
FRRouting (and Quagga and GNU Zebra before it) gives each daemon its own VTY — an IOS-like interactive shell reachable over telnet — and zebra's default is 2601, which FRR's setup guide tells you to add to /etc/services. zebra is the daemon that owns the kernel routing table and RIB for the other protocol daemons, so its VTY can inspect and change routing. Most operators use vtysh over the local Unix sockets instead, and modern FRR packages bind the VTY to localhost or disable the TCP port. Note that IANA registers 2601 as discp-client, unrelated to zebra.
Do not expose
An unencrypted telnet shell into the daemon that controls the routing table, protected at best by a VTY password. Bind it to localhost or disable the TCP VTY and use vtysh.
$ nc -v 127.0.0.1 2601Seen 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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