How Does rpcbind Work in Linux

In the Linux operating system, rpcbind is a program that manages the connections between client and server applications using remote procedure calls (RPCs). It allows a client application to call a function on a server application running on a remote system. It listens for incoming RPC requests and manages the RPC connections between clients and servers. 

When a client application needs to call a function on a server application, it sends an RPC request to the rpcbind service. rpcbind then finds the server that provides the requested service and forwards the RPC request to that server. 

In this article, the detailed guideline about the rpcbind will be discussed by explaining the below content:

  • Working of rpcbing
  • Services that use rpcbind
  • Advantages of rpcbind
  • Disadvantages of rpcbind

How Does rpcbind work?

rpcbind uses a port mapper to register and listen for incoming RPC requests. When a client application sends an RPC request, it specifies the program number and version of the service it wants to use. rpcbind then looks up the program number and version in its RPC program number database to find the universal address of the server providing that service. rpcbind then forwards the RPC request to the server using the universal address.

Services that Use rpcbind

rpcbind is used by various services in Linux, including Network File System (NFS), Remote Procedure Call (RPC), and Common Internet File System (CIFS). These services use rpcbind to manage their RPC connections between clients and servers.

Advantages of rpcbind

Some of the major advantages of rpcbind are listed below:

Improved Performance

rpcbind can improve the performance of client-server applications by managing the connections between them efficiently. rpcbind allows client applications to connect to multiple servers using a single RPC request, reducing the number of network connections needed.

Better Management of Remote Procedure Calls

rpcbind provides a central point of control for managing RPC connections, making it easier to monitor and manage remote procedure calls in a networked environment.

Increased Security

rpcbind can help increase security by providing access control mechanisms for RPC services. It can restrict access to services based on client IP addresses, user IDs, or other authentication mechanisms.

Disadvantages of rpcbind

Some of the major disadvantages of rpcbind are listed below.

Vulnerabilities Associated with rpcbind

rpcbind has a history of security vulnerabilities, which can make it susceptible to attacks. For example, a buffer overflow vulnerability was discovered in rpcbind in 2019, which could allow an attacker to execute arbitrary code or cause a denial-of-service (DoS) attack.

Possible Denial-Of-Service Attacks

rpcbind can also be used in DoS attacks. An attacker can flood the rpcbind service with requests, causing it to consume excessive CPU or memory resources and making it unavailable to legitimate clients.


The rpcbind is a program that manages the connections between client and server applications using RPCs in Linux. It has advantages such as improved performance, better management of remote procedure calls, and increased security. However, it also has disadvantages, such as security vulnerabilities and possible DoS attacks.