What is port 111 rpcbind used for?

Portmapper, also known as Remote Procedure Call Bind (RPCBind), is a mechanism where Internet address ports can be assigned as a program running on a remote computer to act as if it is running on the local computer. RPCBind runs on port 111 and dates back to 1991.

What is the port 111?

Background and Additional Information: Port 111 is a security vulnerability for UNIX systems due to the number of vulnerabilities discovered for the portmapper and related RPC services. The SANS Institute provides a general introduction to the security vulnerabilities associated with port 111.

What does rpcbind stand for?

portmap or just portmap, or rpcbind) is an Open Network Computing Remote Procedure Call (ONC RPC) service that runs on network nodes that provide other ONC RPC services. Version 2 of the port mapper protocol maps ONC RPC program number/version number pairs to the network port number for that version of that program.

Should I open port 111?

If you expose this service to the internet, everybody can query this information without having to authenticate. It can be useful to attackers to know what you have running. Also, the RPC service has a history of security vulnerabilities. So don’t expose it to the world unless you have to.

What port is rpcbind?

port 111
Portmapper and rpcbind standardize the way clients locate information about the server programs that are supported on a network. Portmapper and rpcbind use well-known port 111.

What is the purpose of a portmapper?

A port mapper is the protocol that maps the number or version of an Open Network Computing Remote Procedure Call (ONC RPC) program to a port used for networking by that version of the program.

What would a client need to know if there was no portmapper?

If a server is not registered with a portmapper, you must assign a TCP port number to that server. Your clients will not know where to find your AR System server because the port might be different if the AR System server is restarted.

What uses TCP port 2049?

Network File System (NFS) is used by UNIX clients for file access. NFS uses port 2049. The portmapper service is consulted to get the port numbers for services used with NFSv3 or NFSv2 protocols such as mountd, statd, and nlm.