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Just Lucky Really
Asked: 2015-01-29 08:28:51 +0800 CST

NFS Client Ports

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So I've been trying to get my head around how an NFS client figures out which ports to use, or how to set them.

I enabled logging (In iptables on the nfs client) for traffic between the nfs client and server, and found this (I've numbered them so I can reference them for you):

1. [iptables nfs-tcp-out] ... SPT=949 DPT=2049 ...
2. [iptables nfs-tcp-in ] ... SPT=2049 DPT=949 ...
3. [iptables nfs-tcp-out] ... SPT=35501 DPT=877 ...

So,

  1. I am happy with, random port to nfs port

  2. Also, happy with that, reply from nfs to established random port

  3. This is where I get confused. They seem to be 2 random ports. Are both of these set on the nfs-server? If so, how does the client know which ports to use? Is this negotiated with the first 2 packets?

Also, I have set the rpc.statd ports as --port 32765 --outgoing-port 32766, yet see no traffic on those ports.

Lastly, I see no traffic on port 111, which apparently needs to be open (According to almost every nfs firewall guide)

firewall

1 Answers

  1. Sorry I misunderstood. Think I got it now

    Port 111 (tcp/udp) is the portmapper

    Port 2049 (tcp/udp) is the nfs-server

    So I've been trying to get my head around how an NFS client figures out which ports to use, or how to set them.

    If you would like to assign client ports you can do so in 

     /etc/sysconfig/nfs

    As an example:

     LOCKD_TCPPORT=32803 
 LOCKD_UDPPORT=32769                  
 MOUNTD_PORT=892 
 RQUOTAD_PORT=875 
 STATD_PORT=662
 STATD_OUTGOING_PORT=2020

    Is this what your looking for?

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