854
Summary
- // if you see it open
- DLEP is specified for a local, single-hop router–modem link. Scope discovery traffic to that link; the supplied sources do not establish deployment or public exposure on any particular system.
- // common applications
- Router and modem link coordination UDP multicast is used for discovery; TCP carries DLEP messages after discovery. No particular deployment or traffic observation is supplied.
About port 854/udp.
UDP port 854 is registered as dlep, the Dynamic Link Exchange Protocol. RFC 8175 specifies DLEP between a router and its attached modem on a local link, so this port is not intended as a general public internet service. The registration does not show whether any particular device currently uses it.
DLEP exchanges changing link characteristics and destination events so a router can make routing decisions using information reported by its modem. The RFC specifies UDP multicast for single-hop discovery, then TCP to carry DLEP messages after discovery. Thus, the registered UDP port is associated with discovery; the main session messages use TCP.
Because the specified relationship is local and single-hop, access to DLEP discovery should be limited to the relevant router–modem link. The sources do not establish deployment prevalence, observed exposure, or malware association.
- Intended use
- UDP 854 is registered for DLEP discovery between a router and modem on a local link. [Confirmed]
- Access policy
- Keep discovery scoped to the router–modem link; it is not intended as a general public internet service. [Likely]
- Deployment
- The registration and specification do not establish whether a particular system runs DLEP. [Unknown]
- IANA service
dlep, Dynamic Link Exchange Protocol (DLEP) [Confirmed] — https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.csv
- RFC reference
- RFC 8175 [Confirmed] — https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.csv
- UDP role
- Multicast single-hop discovery signaling [Confirmed] — https://www.rfc-editor.org/rfc/rfc8175.txt
- DLEP peer relationship
- Router and attached modem on a local link [Confirmed] — https://www.rfc-editor.org/rfc/rfc8175.txt
- Deployment on any particular system
- Unknown [Unknown] — https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.csv
Service assignments.
| Name | Protocol | Description | Open frequency |
|---|---|---|---|
| dlep | TCP | Dynamic Link Exchange Protocol (DLEP) | 0.00% |
Service assignments from the IANA Service Name and Transport Protocol Port Number Registry, with open-frequency data from nmap-services.