nfsstat can be used to examine NFS performance.

nfsstat -s reports server-side statistics. In particular, the following are important:

• calls: Total RPC calls received.
• badcalls: Total number of calls rejected by the RPC layer.
• nullrecv: Number of times an RPC call was not available even though it was believed to have been received.
• badlen: Number of RPC calls with a length shorter than that allowed for RPC calls.
  

This post shows the changes to the href="http://zf2.readthedocs.org/en/latest/user-guide/overview.html"
>ZF2 tutorial application that allow it to run with Oracle
Database 11gR2.

Oracle Database SQL identifiers are case insensitive by default so
"select Abc from Xyz" is the same as "select abc from xyz". However
the identifier metadata returned to programs like PHP is standardized
to uppercase by default. After executing either query PHP knows that
column "ABC" was selected from table "XYZ".

 
To allow one trusted IP address to access all incoming packets add following line in iptables-precursor:
iptables -A INPUT -s 192.168.2.2 -j ACCEPT
where 192.168.2.2 is the IP address I would like to allow, change the IP address as per your requirement.
After adding above line run following commands to get it updated:
$ source iptables-precursor

$ iptables-save > iptables

In above commands I used relative pats for iptables-precursor and iptables.