What is the port of NFS?

Table of Contents

NFS uses port 2049. NFSv3 and NFSv2 use the portmapper service on TCP or UDP port 111. The portmapper service is consulted to get the port numbers for services used with NFSv3 or NFSv2 protocols such as mountd, statd, and nlm.

What port does mountd use?

portmapper: 111 (default on all linux distributions) nfs service: 2049 (default on all linux distributions) mountd: 20048 (depends on the linux distribution)

Is portmap required for NFS client?

NFS version 3 (NFSv3) has more features, including 64bit file handles, Safe Async writes and more robust error handling. NFS version 4 (NFSv4) works through firewalls and on the Internet, no longer requires portmapper, supports ACLs, and utilizes stateful operations.

What is RPC mount?

The mountd daemon is a Remote Procedure Call (RPC) that answers a client request to mount a file system. The mountd daemon finds out which file systems are available by reading the /etc/xtab file. In addition, the mountd daemon provides a list of currently mounted file systems and the clients on which they are mounted.

What protocol does NFS use?

Transmission Control Protocol (TCP)
All versions of NFS can use Transmission Control Protocol (TCP) running over an IP network, with NFSv4 requiring it. NFSv2 and NFSv3 can use the User Datagram Protocol (UDP) running over an IP network to provide a stateless network connection between the client and server.

What is NFS and RPC?

NFS uses Remote Procedure Calls (RPC) to route requests between clients and servers, meaning that the portmap service must be enabled and active at the proper runlevels for NFS communication to occur.

Is NFS an RPC service?

NFS is implemented as a set of RPC calls in which the server services certain types of calls made by the client. The client makes such calls based on the file system operations that are done by the client process. NFS, in this sense, is an RPC application.

How do I allow TCP and UDP port 2049 for NFS?

Procedure 9.1. Configure a firewall to allow NFS

Allow TCP and UDP port 2049 for NFS.
Allow TCP and UDP port 111 ( rpcbind / sunrpc ).
Allow the TCP and UDP port specified with MOUNTD_PORT=”port”
Allow the TCP and UDP port specified with STATD_PORT=”port”
Allow the TCP port specified with LOCKD_TCPPORT=”port”

What is NFS in computer?

Network File System (NFS) is a networking protocol for distributed file sharing. A file system defines the way data in the form of files is stored and retrieved from storage devices, such as hard disk drives, solid-state drives and tape drives.

What is NFS vulnerability?

NFS like any other unprotected network protocol is vulnerable to two types of attacks: eavesdropping and impostor attack. An eavesdropper can pick up unauthorized data as it goes by on the network. An impostor can gain an unauthorized access to the network.

How do I enumerate open NFS shares on port 2049?

The Nmap nfs-showmount script can also be used to enumerate open NFS shares. If port 2049 is not open to remote connections, SSH port forwarding can be used to forward connections to the Kali host to the target host on port 2049: NFS shares can be enumerated locally by inspecting the /etc/exports file:

Why is NFS mount port 2049 vulnerable to attack?

A remote attacker could send a specially-crafted NFS Mount request to TCP port 2049 to cause a kernel panic, resulting in a denial of service. Novell Netware is vulnerable to a stack-based buffer overflow, caused by improper bounds checking by the xnfs.nlm component when processing NFS requests.

What ports are used for portmapper and NFS?

For nfsd, we usually use TCP or UDP port 2049. The ports for other NFS services like mounted, nlockmgr, status are product-dependent. The following are the NFSv3 ports that are used for NetApp data Ontap and NetApp 7 mode. These are two different products for NetApp company. We can see that the ports for portmapper and nfsd are the same.

What is the port of NFS?