Matteo Mattei

Hello, my name is Matteo Mattei and this is my personal website. I am computer engineer with a long experience in Linux system administration and web software development.

linkedin rss twitter google+ github facebook

Mount NFS share using Virtualbox under NAT

I am using Ubuntu 14.04 (but it is valid also with other Linux distributions) that runs under Virtualbox. My network interface is set as NAT and I am running nfs version 4 (NFSv4).

Every time I try to mount a remote share I always obtain the following error:

matteo@vm:~$ sudo mount -t nfs /mnt/remote
mount.nfs: access denied by server while mounting

And in the kernel log (dmesg) I see this:

[ 1351.443078] RPC: server requires stronger authentication.

The issue here is that the NFS client is trying to use UDP protocol to access the remote host. You can verify it by capturing the network traffic with wireshark (or tcpdump). In this case is sufficient to force the usage of the TCP protocol when you mount the share:

matteo@vm:~$ sudo mount -t nfs /mnt/remote -o proto=tcp

Another option is to change your network adapter in Virtualbox from NAT to BRIDGE.

That’s all for the moment.

comments powered by Disqus