OpenSolaris 20050909 - Build 22 - NFS port binding default.

In Solaris Nevada build number 22; aka OpenSolaris-20050909 the default for the NFS client is to use a non reserved port for the connection to the server.

If the server should require the use of a reserved port the default may be changed by setting the value of clnt_cots_do_bindresvport (for TCP) to 1 and clnt_clts_do_bindresvport for UDP.

Great, now how exactly do you do that ?

For a quick fix on a running system (as the root user) we can use MDB like this:

# echo "clnt_cots_do_bindresvport/W 1" | mdb -kw 

if this proves to work and you want to make this permanent then we need to add an entry to /etc/system. When adding to /etc/system you will need to know in which module clnt_cots_do_bindresvport resides. Again using mdb we can do this:

# echo "clnt_cots_do_bindresvport::whatis" | mdb -k
7024045c is clnt_cots_do_bindresvport+0 in rpcmod's data segment

so adding the following to /etc/system will set the value on reboot:

set rpcmod:clnt_cots_do_bindresvport=1

See also: This NFS thread

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[posted with ecto]