Using NFS over TCP
To mount a shared directory using NFS over TCP, use the “proto=tcp” mount option:
# mount -o proto=tcp :/pub /usr/local/pub
Make sure the target directory, in this example /usr/local/pub, exists on the client.
You can verify the NFS over TCP mount using the mount command:
If you need NFS, it is recommended to use NFS over TCP since NFS over UDP is not very secure. All 2.4 and 2.6 kernels support NFS over TCP on the client side. Server support for TCP appears in later 2.4 kernels, and in all 2.6 kernels.
To verify whether your server supports NFS over TCP, use the wire-test command (/usr/sbin/wire-test is part of the am-utils package). If your server supports NFS over TCP, the output looks like this:
# wire-test localhost
NFS Version and protocol tests to host “localhost”…
testing vers=2, proto=”udp” -> found version 2.
testing vers=3, proto=”udp” -> found version 3.
testing vers=2, proto=”tcp” -> found version 2.
testing vers=3, proto=”tcp” -> found version 3.
#
NFS Version and protocol tests to host “localhost”…
testing vers=2, proto=”udp” -> found version 2.
testing vers=3, proto=”udp” -> found version 3.
testing vers=2, proto=”tcp” -> found version 2.
testing vers=3, proto=”tcp” -> found version 3.
#
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