[CentOS] NFS client firewall config?

Agile Aspect agile.aspect at gmail.com
Thu Feb 18 20:22:44 UTC 2010


On Thu, Feb 18, 2010 at 3:00 AM, Rudi Ahlers <Rudi at softdux.com> 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
>
> --

I would strongly recommend using NFS4 if at all possible.

See Chapter 18 for NFS in general and 18.8 for security issues

  http://www.centos.org/docs/5/html/Deployment_Guide-en-US/s1-nfs-security.html

-- 
      Enjoy global warming while it lasts.


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