Port 701Link Management Protocol
Link Management Protocol (LMP) is utilized to manage and maintain traffic engineering links between network nodes, primarily within optical and Multi-Protocol Label Switching (MPLS) networks. It facilitates the establishment, monitoring, and fault detection of data paths, helping ensure reliable, optimized communication between connected devices..
- transport
- tcp
- in transit
- cleartext
- assignment
- official
- risk
- 4/10
- lookups
- 6,804
single transport
payload readable on path
registered with iana
caution
rank 752 of 993 · top 76%
Technical Details
what runs on :701Overview
Link Management Protocol (LMP) operates between two adjacent nodes to manage data-plane resources such as links and channels within traffic-engineered networks, especially those leveraging optical transport and MPLS architectures. LMP is essential for network operators seeking efficient coordination and management of physical and logical data channels.
Functionality
LMP provides vital functionalities, including control channel management, link verification, fault isolation, and failure detection. It allows for a clear demarcation of responsibilities between the data and control planes, which simplifies management and troubleshooting. LMP continuously monitors the health of the links and can quickly identify and isolate faults, facilitating swift rerouting and minimizing traffic disruptions.
Protocol Operation
Operating primarily on TCP port 701, LMP exchanges various types of control messages such as Hello, Config, LinkSummary, and Fault messages. These help maintain the state and synchronization of links, enable efficient maintenance, and ensure faster recovery in case of failures. The protocol’s support for multiple data channels per control channel lends it robustness and scalability in carrier-grade networks.
Security Information
exposure of :701risk score
4/ 10caution
worth attention. how exposed you are depends on configuration — don't leave it reachable from the internet without a reason.
network services averages 3.9 across 604 ports — this one sits 0.1 above.
in transit
cleartext
credentials and payloads are readable by anyone on path
assignment
official
registered with iana for this service — scanners fingerprint it by number
reachable over
tcp
every listening transport is another surface to filter at the edge
security overview
Common Vulnerabilities
- Since LMP runs over TCP without mandatory encryption, it is susceptible to eavesdropping and man-in-the-middle attacks.
- Attackers might exploit the protocol to inject false messages leading to incorrect link status information, facilitating denial-of-service (DoS) conditions.
- Lack of authentication mechanisms can permit unauthorized nodes to participate in or disrupt link management operations.
Common Mitigations
- Utilize strong authentication techniques such as IPsec to secure communication between nodes.
- Deploy network-based intrusion prevention systems (IPS) to detect and block suspicious LMP activities.
- Restrict LMP access to trusted hosts and segments, using access control lists (ACLs) and network segmentation.
- Regular monitoring and logging of LMP traffic to detect anomalies early and respond promptly.
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risk mix of the 8 listed
- caution100%
0 of 8 encrypted