Port 179 supports BGP and bgp (UDP/SCTP reference coverage) across distinct transports. Review each protocol before writing firewall or monitoring policy.
Exchanges network reachability between BGP peers.
Internet and private-network routing between explicitly configured routers.
Bidirectional
Permit only configured peers, use TTL/hop protections and authentication where supported, and apply route policy and prefix filtering.
bgp (UDP/SCTP reference coverage) is documented as a network service convention for port 179 over UDP + SCTP.
Use this reference entry when identifying or validating systems documented to use 179/UDP + SCTP.
Varies
Confirm the listening process and current vendor documentation before permitting traffic; a listed convention does not prove the active service or its security posture.