NFS port configuration

We have discussed a lot about NFS. I wonder if you have any questions. Today, we will mainly explain how to set NFS ports. In many network environments, different port settings may cause different functions. To use NFS in a firewall environment, open the following ports on the firewall:

 
 

  
  
1. portmap port 111 udp/tcp;
  
  
2. nfsd port 2049 udp/tcp;
  
  
3. mountd port "xxx" udp/tcp
 
 

When the system RPC service starts the nfs service, a random port 32768--65535 is dynamically selected for mountd by default. You can specify a fixed port for mountd by editing the/etc/services file:

 
 

  
  
# vi /etc/services 
 
 

Add at the end

 
 

  
  
mountd 1011/udp  
  
  
mountd 1011/tcp 
 
 

Save this file

 
 

  
  
# stopsrc -s rpc.mountd  
  
  
# startsrc -s rpc.mountd  
  
  
# exportfs -a  
  
  
# rpcinfo -p Hostname 
 
 

Now we will find that mountd has been bound to port 1011.

In addition, the services that need to be communicated in nfs include rpc. lockd and rpc. statd. For lockd, we can use a similar method to specify a fixed port,

 
 

  
  
# vi /etc/services 
 
 

Add

 
 

  
  
lockd 35000/ucp  
  
  
lockd 35000/tdp  
  
  
# stopsrc -s rpc.lockd  
  
  
# startsrc -s rpc.lockd  
  
  
# exportfs -a 
 
 

Nfs client mount file system

 
 

  
  
# rpcinfo -p Hostname 
 
 

However, rpc. statd cannot be used to specify a port. It can only use a random port. If necessary, open the random port based on the display of the following command on the firewall:

 
 

  
  
# no -a |grep ephemeral  
  
  
tcp_ephemeral_high = 65535 
  
  
tcpp_ephemeral_low = 32768 
  
  
udp_ephemeral_high = 65535 
  
  
udp_ephemeral_low = 32768 
 
 

You can also disable rpc. the random port required by statd is affected by the failure of nfs connections, such as server or client). The system cannot restore the status before the disconnection through statd, the nfs file system must be mounted again.

For more information about statd functionality, see http://publib.boulder.ibm.com/infocenter/

Pseries/v5r3/topic/com. ibm. aix. cmds/doc/aixcmds5/statd.htm