[CentOS] NFS client firewall config?

Tony Molloy tony.molloy at ul.ie
Thu Feb 18 11:40:16 UTC 2010


On Thursday 18 February 2010 11:23:43 Rudi Ahlers wrote:
> On Thu, Feb 18, 2010 at 1:11 PM, Tony Molloy <tony.molloy at ul.ie> wrote:
> > On Thursday 18 February 2010 11:00:53 Rudi Ahlers wrote:
> > > Hi all,
> > >
> > > Which ports do I need to have open on an NFS client's firewall to allow
> >
> > it
> >
> > > to connect to a remote NFS servers?
> > >
> > > When I disable iptables (using ConfigServerFirewall), it connects fine,
> >
> > but
> >
> > > as soon as I enable it, NFS gives me this error:
> > > root at saturn:[~]$ mount master1.mydomain.co.za:/saturn /bck
> > > mount: mount to NFS server 'master1.mydomain.co.za' failed: RPC Error:
> > > Unable to send.
> > >
> > > I have added ports 111 & 2049 in both the TCP & UDP ingres & exgress
> > >  ranges, but that doesn't seem to help. portmap & nfs is running as
> > > well. But as I say, as soon as I disable the firewall, it mounts fine.
> > >
> > > Google search results reveal a lot of different ports, like 4000:4004,
> > > 83xxxx (something, I forgot) but it still doesn't help.
> > >
> > >
> > > root at saturn:[~]$ rpcinfo -p
> > >    program vers proto   port
> > >     100000    2   tcp    111  portmapper
> > >     100000    2   udp    111  portmapper
> > >     100021    1   udp  48996  nlockmgr
> > >     100021    3   udp  48996  nlockmgr
> > >     100021    4   udp  48996  nlockmgr
> > >     100021    1   tcp  47195  nlockmgr
> > >     100021    3   tcp  47195  nlockmgr
> > >     100021    4   tcp  47195  nlockmgr
> > >     100011    1   udp   4004  rquotad
> > >     100011    2   udp   4004  rquotad
> > >     100011    1   tcp   4004  rquotad
> > >     100011    2   tcp   4004  rquotad
> > >     100003    2   udp   2049  nfs
> > >     100003    3   udp   2049  nfs
> > >     100003    4   udp   2049  nfs
> > >     100003    2   tcp   2049  nfs
> > >     100003    3   tcp   2049  nfs
> > >     100003    4   tcp   2049  nfs
> > >     100005    1   udp   4003  mountd
> > >     100005    1   tcp   4003  mountd
> > >     100005    2   udp   4003  mountd
> > >     100005    2   tcp   4003  mountd
> > >     100005    3   udp   4003  mountd
> > >     100005    3   tcp   4003  mountd
> >
> > Hi,
> >
> > NFS by default uses random high numbered ports. See "48996  nlockmgr"
> > above.
> > You need to tie them down to allow them through your firewall
> >
> > Create the following file /etc/sysconfig/nfs
> >
> > #/etc/sysconfig/nfs
> > # Created 05.07.05 by Tony Molloy
> >
> > # Number of NFS threads to run
> > RPCNFSDCOUNT=48
> >
> > # ports for statd daemon
> > STATD_PORT=4000
> > STATD_OUTGOING_PORT=4004
> >
> > # ports for lockd daemon
> > LOCKD_TCPPORT=4001
> > LOCKD_UDPPORT=4001
> >
> > # ports for mountd daemon
> > #MOUNTD_NFS_V2=no
> > #MOUNTD_NFS_V3=no
> > MOUNTD_PORT=4002
> >
> > # ports for rquota daemon
> > #RQUOTAD=no
> > RQUOTAD_PORT=4003
> >
> >
> > Then open ports 4000:4004 in you firewall as well as port 111 the
> > portmapper
> > and port 2049 for NFS
> >
> > Hope this helps,
> >
> > Tony
> >
> >
> > --
> >
> > Chief Technical Officer.                   Tel: +353 061-202778
> > Dept. of Comp. Sci.
> > University of Limerick.
> >
> > _______________________________________________
> > CentOS mailing list
> > CentOS at centos.org
> > http://lists.centos.org/mailman/listinfo/centos
> 
> Hi Tony,
> 
> Where do I do this? On the NFS server, or the NSF client?
> 

Put the file on the NFS server and open the ports on the NFS server. Then 
restart NFS services

# service nfs start
# service nfslock start

To make these permanent

# chkconfig --level 35 nfs on
# chkconfig --level 35 nfslock on

Check with rpcinfo that NFS is using the specified ports.

Tony

> 4 other NFS clients have connected to this server successfully, and I used
> the same settings (i.e. opened port 111 & 4096) on the client's firewall
> 

-- 

Chief Technical Officer.                   Tel: +353 061-202778
Dept. of Comp. Sci.
University of Limerick.



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