Follow Techotopia on Twitter

On-line Guides
All Guides
eBook Store
iOS / Android
Linux for Beginners
Office Productivity
Linux Installation
Linux Security
Linux Utilities
Linux Virtualization
Linux Kernel
System/Network Admin
Scripting Languages
Development Tools
Web Development
GUI Toolkits/Desktop
Mail Systems
Eclipse Documentation

How To Guides
General System Admin
Linux Security
Linux Filesystems
Web Servers
Graphics & Desktop
PC Hardware
Problem Solutions
Privacy Policy




Red Hat Enterprise Linux 9 Essentials Book now available.

Purchase a copy of Red Hat Enterprise Linux 9 (RHEL 9) Essentials

Red Hat Enterprise Linux 9 Essentials Print and eBook (PDF) editions contain 34 chapters and 298 pages

Preview Book

10.6.3. Running NFS Behind a Firewall

NFS requires rpcbind, which dynamically assigns ports for RPC services and can cause problems for configuring firewall rules. To allow clients to access NFS shares behind a firewall, edit the /etc/sysconfig/nfs configuration file to control which ports the required RPC services run on.
The /etc/sysconfig/nfs may not exist by default on all systems. If it does not exist, create it and add the following variables, replacing port with an unused port number (alternatively, if the file exists, un-comment and change the default entries as required):
Controls which TCP and UDP port mountd (rpc.mountd) uses.
Controls which TCP and UDP port status (rpc.statd) uses.
Controls which TCP port nlockmgr (rpc.lockd) uses.
Controls which UDP port nlockmgr (rpc.lockd) uses.
If NFS fails to start, check /var/log/messages. Normally, NFS will fail to start if you specify a port number that is already in use. After editing /etc/sysconfig/nfs, restart the NFS service using service nfs restart. Run the rpcinfo -p command to confirm the changes.
To configure a firewall to allow NFS, perform the following steps:
  1. Allow TCP and UDP port 2049 for NFS.
  2. Allow TCP and UDP port 111 (rpcbind/sunrpc).
  3. Allow the TCP and UDP port specified with MOUNTD_PORT="port"
  4. Allow the TCP and UDP port specified with STATD_PORT="port"
  5. Allow the TCP port specified with LOCKD_TCPPORT="port"
  6. Allow the UDP port specified with LOCKD_UDPPORT="port"

  Published under the terms of the Creative Commons License Design by Interspire