The man page for nfs shows this:
tcp Mount the NFS filesystem using the TCP proÂ
tocol instead of the UDP protocol. This is
the default, but in case it fails (many NFS
servers only support UDP) it will fallback
and try UDP.
Not sure how one can conclusively show which protocol it is using.
/etc/services shows
nfs 2049/tcp # Network File System - Sun Microsystems
nfs 2049/udp # Network File System - Sun Microsystems
Scully, William P wrote:
Earlier on this list participants mention that NFS can run over UDP (no
added reliability) and over TCP (has error recovery). Perhaps these are
two obvious questions:
1) How does one tell which protocol is being used by a particular NFS
client?
2) How does one ensure an NFS server is using the TCP rather than UDP
protocol?
I ask this because we periodically see unrepeatable MD5 checksum errors
on our ISO materials, which (when one follows the trail) are located on
an NFS "appliance" server.
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